On-Highway Engines Electronic PTO Installation and Application Guide Caterpillar

The tables that follow list the following information: sequence of events, action that is taken by the operator of the PTO and position of the controlling equipment. The positions produce the resultant engine rpm within a specific programmed limit. The following components are used in order to provide a demonstration of the interaction of different systems: Cruise Control On/Off switch, PTO On/Off switch, Set/Resume switch, Fast Idle On/Off switch and Accelerator Pedal. Most systems will require only some of the components.

Note: (Fast Idle) is not available for the H/D engines.

The Programmable Engine Limits

Note: Before performing each test, reset the parameters to the factory defaults. This will ensure that a parameter that was used for one test is not active for another test. The parameters that are given in the tables must be programmed in order to perform the tests.

The parameters that are given in Table 1 must be programmed in order to perform the following test.

The tables have the rpm ranges for theMedium DutyEngines M/D ( 3126B, 3126E, C7, and C9). The tables also have the rpm ranges for the Heavy Duty Engines H/D ( C-10, C11, C-12, C13, 3406E, C15, C-15, C-16, and C-18).

Table 1

Parameter Programming for the Programmable Engine Limits
"PTO Configuration"	Cab Switches
"PTO Top Engine Limit" The PTO Top Engine Limit can be programmed anywhere between the Low Idle Speed and the Top Engine Limit.	2100 rpm 2000 rpm H/D
"PTO Cab Throttle RPM Limit"	PTO Top Engine Limit
"Low Idle RPM"	700 rpm 600 rpm H/D
"Idle RPM Limit"	900 rpm
"Top Engine Limit"	2460 rpm C7, 3126B, and 3126E engines 2350 rpm C9 2120 rpm H/D
"Fast Idle Engine RPM" This option is not used on H/D engines.	1000 rpm

Table 2

The Programmable Engine Limits
Frame 1
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The Cruise Control switch is OFF. The PTO switch is OFF. The Set/Resume switch is OFF. The Fast Idle switch is OFF. The accelerator pedal is not depressed.	Park the vehicle with the engine at idle.	The engine is at the programmed Low Idle rpm. Programmed Low Idle for H/D engines is 600 rpm.	700 rpm 600 rpm H/D

Table 3

The Programmable Engine Limits
Frame 2
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The Cruise Control switch is OFF. The PTO switch is OFF. The Set/Resume switch is OFF. The Fast Idle switch is OFF. The Accelerator Pedal is fully depressed.	Fully depress the accelerator pedal.	The engine is limited by the programmed "Top Engine Limit (TEL)". The TEL in this instance is 2640 rpm. Programmed TEL for C9 engines is 2350 rpm. Programmed TEL for H/D engines is 2120 rpm.	2640 rpm C7, 3126B, and 3126E 2350 rpm C9 2120 rpm H/D

Table 4

The Programmable Engine Limits
Frame 3
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The Cruise Control switch is ON. The PTO switch is OFF. The Set/Resume switch is in the Set position. The Fast Idle switch is OFF. The accelerator pedal is fully depressed.	Place the Cruise Control switch to the ON position. Place the Set/Resume switch to the Set position.	The engine is limited by the programmed TEL which is 2640 rpm. Programmed TEL for C9 engines is 2350 rpm. Programmed TEL for H/D engines is 2120 rpm.	2640 rpm C7, 3126B, and 3126E 2350 rpm C9 2120 rpm H/D

Note: The "PTO Top Engine Limit" (PTO TEL) can be programmed anywhere between the Low Idle Speed and the Top Engine Limit.

Table 5

The Programmable Engine Limits
Frame 4
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The Cruise Control switch is ON. The PTO switch is OFF. The Set/Resume switch is OFF. The Fast Idle switch is OFF. The accelerator pedal is released.	Release the accelerator pedal. Release the Set/Resume switch from the Set position.	The engine is at the programmed "Idle RPM Limit" which is 900 rpm.	900 rpm

Table 6

The Programmable Engine Limits
Frame 5
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The Cruise Control switch is ON. The PTO switch is ON. The Set/Resume switch is OFF. The Fast Idle switch is OFF. The accelerator pedal is released.	Turn the PTO On/Off switch to ON.	The engine will return to Low Idle rpm because a PTO rpm has not been set. The PTO On/Off switch will override the Cruise Control On/Off switch. The "PTO Vehicle Speed Limit" must be higher than the actual vehicle speed.	700 rpm 600 rpm H/D

Table 7

The Programmable Engine Limits
Frame 6
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The Cruise Control switch is ON. The PTO switch is ON. The Set/Resume switch is in the Set position. The Fast Idle switch is OFF. The accelerator pedal is fully depressed.	Place the Set/Resume switch in the Set position and fully depress the accelerator pedal.	The engine is at the PTO TEL which is 2100 rpm. PTO TEL for H/D engines is 2000 rpm.	2100 rpm 2000 rpm H/D

Note: The "PTO Top Engine Limit" (PTO TEL) can be programmed anywhere between the Low Idle Speed and the Top Engine Limit.

Table 8

The Programmable Engine Limits
Frame 7
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The Cruise Control switch is ON. The PTO switch is ON. The Set/Resume switch is OFF. The Fast Idle switch is OFF. The accelerator pedal is released.	Release the Set/Resume switch. Release the accelerator pedal.	The engine will remain at the PTO TEL which is 2100 rpm. PTO TEL for H/D engines is 2000 rpm.	2100 rpm 2000 rpm H/D

Table 9

The Programmable Engine Limits
Frame 8
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The Cruise Control switch is OFF. The PTO switch is OFF. The Set/Resume switch is OFF. The Fast Idle switch is OFF. The accelerator pedal is released.	Turn the Cruise Control On/Off switch to the OFF position. Turn the PTO On/Off switch to the OFF position.	The engine will return to the Low Idle rpm which is 700 rpm. Low Idle rpm for H/D engines is 600 rpm.	700 rpm 600 rpm H/D

Table 10

The Programmable Engine Limits
Frame 9
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The Cruise Control switch is OFF. The PTO switch is OFF. The Set/Resume switch is OFF. The Fast Idle switch is ON. The accelerator pedal is released.	Turn the Fast Idle switch to the ON position and then release. The switch will automatically return to the OFF position when the switch is released.	The engine will accelerate to the programmed "Fast Idle rpm" which is 1000 rpm.	1000 rpm

Note: (Fast Idle) is not available for the H/D engines.

Table 11

The Programmable Engine Limits
Frame 10
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The Cruise Control switch is ON. The PTO switch is OFF. The Set/Resume switch is OFF. The Fast Idle switch is OFF. The accelerator pedal is released.	Turn the Cruise Control On/Off switch to the ON position.	The engine remains at the programmed "Fast Idle rpm" which is 1000 rpm.	1000 rpm

Table 12

The Programmable Engine Limits
Frame 11
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The Cruise Control switch is ON. The PTO switch is ON. The Set/Resume switch is OFF. The Fast Idle switch is OFF. The accelerator pedal is released.	Turn the PTO On/Off switch to the ON position.	The engine returns to the programmed Low Idle rpm because a PTO rpm has not been set. The PTO On/Off switch will override the Fast Idle.	700 rpm

Table 13

The Programmable Engine Limits
Frame 12
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The Cruise Control switch is ON. The PTO switch is OFF. The Set/Resume switch is in the RESUME position. The Fast Idle switch is OFF. The accelerator pedal is released.	Turn the PTO On/Off switch to the OFF position. Turn the Set/Resume switch to the RESUME position. The switch will release after the RESUME position.	The engine will return to the Idle rpm Limit that was set in Frame 4.	900 rpm

Table 14

The Programmable Engine Limits
Frame 13
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The Cruise Control switch is ON. The PTO switch is OFF. The Set/Resume switch is OFF. The Fast Idle switch is ON. The accelerator pedal is released.	Turn the Fast Idle switch to the ON position and then release.	The engine will accelerate to the programmed "Fast Idle rpm", which is 1000 rpm. The "Fast Idle rpm" is set higher than the Idle rpm. The "Fast Idle rpm" overrides the Cruise Control.	1000 rpm

"Fast Idle Operation"

Note: The Fast Idle option is not used on all engines.

Table 15 illustrates the engine speed control by using the Fast Idle Enable switch. The Fast Idle Enable switch is a dash mounted switch. The switch is standard in GMC and Chevrolet Medium Duty Trucks. The switch is optional in all other chassis. The "Fast Idle Engine RPM 1" parameter provides one set speed above Low Idle operation. The "Fast Idle Engine RPM 2" parameter provides an additional set speed above Low Idle operation.

NOTE: The programmed value for the "Fast Idle Engine RPM 1" can be overridden by using the accelerator pedal that is in the cab. Once the programmed value is overridden, the new value is used until the ignition key is turned OFF. Press the accelerator pedal to the new speed and press the Fast Idle switch. This will override the "Fast Idle Engine RPM 1". The programmed value for the "Fast Idle Engine RPM 2" can not be overridden.

The parameters that are given in Table 15 must be programmed in order to perform the following test.

Table 15

Parameter Programming for "Fast Idle Operation"
"PTO Configuration"	OFF
"Low Idle RPM"	700 rpm
"Fast Idle Engine RPM 1"	1000 rpm
"Fast Idle Engine RPM 2"	1500 rpm

Table 16

"Fast Idle Operation"
Frame 1
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The Fast Idle Switch is OFF. The accelerator pedal is released.	Start the engine.	The engine is at the programmed Low Idle of 700 rpm.	700 rpm

Table 17

"Fast Idle Operation"
Frame 2
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The Fast Idle Switch is ON. The accelerator pedal is released.	Turn the Fast Idle switch to the ON position and then release.	The engine will ramp up to 1000 rpm.	1000 rpm

Table 18

"Fast Idle Operation"
Frame 3
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The Fast Idle switch is ON. The accelerator pedal is released.	Turn the Fast Idle switch to the ON position and then release.	The engine will then ramp up to 1500 rpm.	1500 rpm

Table 19

"Fast Idle Operation"
Frame 4
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The Fast Idle Switch is ON. The accelerator pedal is released.	Turn the Fast Idle switch to the ON position and then release.	The engine will return to the programmed Low Idle of 700 rpm.	700 rpm

Table 20

"Fast Idle Operation"
Frame 5
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The Fast Idle Switch is ON. The accelerator pedal is depressed.	In order to override the programmed "Fast Idle Engine RPM", the accelerator pedal must be depressed until the desired rpm is achieved. Quickly toggle the Fast Idle Enable Switch to the ON position and then release. In this example, 1200 rpm is used.	The engine will go to 1200 rpm. The programmed "Fast Idle Engine RPM 1" has been overridden. NOTE: The programmed "Fast Idle Engine RPM 2" can not be overridden.	1200 rpm

Table 21

"Fast Idle Operation"
Frame 6
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The Fast Idle Switch is OFF. The accelerator pedal is released.	Release the accelerator pedal.	The engine is now at the new "Fast Idle Engine RPM", which is 1200 rpm. 1200 rpm is the temporary "Fast Idle Engine RPM".	1200 rpm

Engine Operation with "PTO Engine RPM Set Speed"

The parameter for the "PTO Engine RPM Set Speed" is useful only if one or two specific engine rpm above low idle is required. Program this parameter to the same value as the "PTO Top Engine Limit" if ONLY one specific engine rpm above low idle is required.

This parameter determines the amount of engine rpm when the PTO On/Off switch is turned to the ON position. The parameter for the "PTO to Set Speed" must also be programmed to YES. If the "PTO to Set Speed" is programmed to NO, then this speed can be achieved by using the RPM Increase/RPM Decrease switch.

NOTE: The parameter for the "PTO Engine RPM Set Speed" can override the parameter for the "Idle/PTO Bump RPM". If the "PTO Engine RPM Set Speed" is programmed above 0 rpm, then the Set/Resume switch will function as the RPM Increase/RPM Decrease switch. This occurs when the PTO On/Off switch is ON.

Example 1 illustrates PTO operation with two specific engine rpm above low idle. Example 1 also illustrates the "PTO Engine RPM Set Speed". In this example, the "PTO Engine RPM Set Speed" is for applications that require engine operation at low idle, at an intermediate rpm, and at the "PTO Top Engine Limit".

Note: The PTO Top Engine Limit (PTO TEL) can be programmed anywhere between the Low Idle Speed and the Top Engine Limit.

Example 2 illustrates PTO operation with one specific engine rpm above low idle.

Example 1

Table 22

Example 1 of the Parameter Programming for the "PTO Engine RPM Set Speed"
"PTO Engine RPM Set Speed"	1500 rpm
"PTO Top Engine Limit"	2100 rpm 2000 rpm H/D

Table 23

Example 1 of the "PTO Engine RPM Set Speed"
Frame 1
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The RPM Increase/Decrease switch is OFF.	Turn the PTO On/Off switch to the ON position and leave the throttle at the Low Idle position.	The engine will remain at Low Idle, which is 700 rpm. Low Idle for H/D engines is 600 rpm.	700 rpm 600 rpm H/D

Table 24

Example 1 of the "PTO Engine RPM Set Speed"
Frame 2
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The RPM Increase/Decrease switch is set to Increase.	Turn the RPM Increase/Decrease switch to the Increase position.	There should be no change in engine rpm. The "PTO Engine RPM Set Speed" is programmed and the engine will not respond until the RPM Increase/Decrease switch is released.	700 rpm 600 rpm H/D

Table 25

Example 1 of the "PTO Engine RPM Set Speed"
Frame 3
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The RPM Increase/Decrease switch is released.	Release the RPM Increase/Decrease switch.	The engine will ramp up to the "PTO Engine RPM Set Speed" which is 1500 rpm. This will happen only after the RPM Increase/Decrease switch is released.	1500 rpm

Table 26

Example 1 of the "PTO Engine RPM Set Speed"
Frame 4
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The RPM Increase/Decrease switch is set to Increase.	Turn the RPM Increase/Decrease switch to the Increase position.	There should be no change in engine rpm. The "PTO Engine RPM Set Speed" is programmed and the engine will not respond until the RPM Increase/Decrease switch is released.	1500 rpm

Table 27

Example 1 of the "PTO Engine RPM Set Speed"
Frame 5
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The RPM Increase/Decrease switch is released.	Release the RPM Increase/Decrease switch.	The engine will ramp up to the "PTO Top Engine Limit", which is 2100 rpm. This will happen only after the RPM Increase/Decrease switch is released. The "PTO Top Engine Limit" is 2000 rpm for H/D engines.	2100 rpm 2000 rpm H/D

Table 28

Example 1 of the "PTO Engine RPM Set Speed"
Frame 6
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The RPM Increase/Decrease switch is set to Decrease.	Turn the RPM Increase/Decrease switch to the Decrease position.	There should be no change in engine rpm. The "PTO Engine RPM Set Speed" is programmed and the engine will not respond until the RPM Increase/Decrease switch is released. "PTO Engine RPM Set Speed" is 2000 rpm for H/D engines.	2100 rpm 2000 rpm H/D

Table 29

Example 1 of the "PTO Engine RPM Set Speed"
Frame 7
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The RPM Increase/Decrease switch is released.	Release the RPM Increase/Decr""ease switch.	The engine will ramp to the "PTO Engine RPM Set Speed", which is 1500 rpm. This will happen only after the RPM Increase/Decrease switch is released.	1500 rpm

Table 30

Example 1 of the "PTO Engine RPM Set Speed"
Frame 8
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The RPM Increase/Decrease switch is set to Decrease.	Turn the RPM Increase/Decrease switch to the Decrease position.	There should be no change in engine rpm. The "PTO Engine RPM Set Speed" is programmed and the engine will not respond until the RPM Increase/Decrease switch is released.	1500 rpm

Table 31

Example 1 of the "PTO Engine RPM Set Speed"
Frame 9
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The RPM Increase/Decrease switch is released.	Release the RPM Increase/Decrease switch.	The engine will ramp to the programmed low idle rpm, which is 700 rpm. This will happen only after the RPM Increase/Decrease switch is released. Programmed Low Idle rpm for H/D engines is 600 rpm.	700 rpm 600 rpm H/D

Example 2

Table 32

Example 2 of the Parameter Programming for the "PTO Engine RPM Set Speed"
"PTO to Set Speed"	NO
"PTO Engine RPM Set Speed"	1500 rpm
"PTO Top Engine Limit"	1500 rpm

Table 33

Example 2 of the "PTO Engine RPM Set Speed"
Frame 1
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The RPM Increase/Decrease switch is OFF.	Turn the PTO On/Off switch to the ON position.	The engine will remain at Low Idle, which is 700 rpm. Low Idle on H/D engines is 600 rpm.	700 rpm 600 rpm H/D

Table 34

Example 2 of the "PTO Engine RPM Set Speed"
Frame 2
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The RPM Increase/Decrease switch is set to Increase.	Turn the RPM Increase/Decrease switch to the Increase position.	There should be no change in engine rpm. The "PTO Engine RPM Set Speed" is programmed and the engine will not respond until the RPM Increase/Decrease switch is released.	700 rpm 600 rpm H/D

Table 35

Example 2 of the "PTO Engine RPM Set Speed"
Frame 3
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The RPM Increase/Decrease switch is released.	Release the RPM Increase/Decrease switch.	The engine will ramp up to the "PTO Engine RPM Set Speed", which is 1500 rpm. This will happen only after the RPM Increase/Decrease switch is released.	1500 rpm

Table 36

Example 2 of the "PTO Engine RPM Set Speed"
Frame 4
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The RPM Increase/Decrease switch is set to Increase.	Turn the RPM Increase/Decrease switch to the Increase position.	There should be no change in engine rpm. The "PTO Engine RPM Set Speed" is programmed. The engine will not respond until the RPM Increase/Decrease switch is released.	1500 rpm

Table 37

Example 2 of the "PTO Engine RPM Set Speed"
Frame 5
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The RPM Increase/Decrease switch is released.	Release the RPM Increase/Decrease switch.	There should be no change in engine rpm. The "PTO Top Engine Limit" is programmed to the same rpm as the" PTO Engine RPM Set Speed", which is 1500 rpm.	1500 rpm

Table 38

Example 2 of the "PTO Engine RPM Set Speed"
Frame 6
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The RPM Increase/Decrease switch is set to Decrease.	Turn the RPM Increase/Decrease switch to the Decrease position.	There should be no change in engine rpm. The "PTO Engine RPM Set Speed" is programmed and the engine will not respond until the RPM Increase/Decrease switch is released.	1500 rpm

Table 39

Example 2 of the "PTO Engine RPM Set Speed"
Frame 7
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The RPM Increase/Decrease switch is released.	Release the RPM Increase/Decrease switch.	The engine will ramp to the programmed Low Idle rpm, which is 700 rpm. This will happen only after the RPM Increase/Decrease switch is released. Programmed Low Idle rpm for H/D engines is 600 rpm.	700 rpm 600 rpm H/D

"PTO to Set Speed Engine Operation"

The engine will accelerate to the "PTO Engine RPM Set Speed" when the "PTO to Set Speed" parameter is programmed to YES. The PTO On/Off switch must be ON. This is useful for applications that require only one specific engine rpm above low idle. Only one circuit is required.

Table 40

Parameter Programming for "PTO to Set Speed Engine Operation"
"PTO to Set Speed"	YES
"PTO Engine RPM Set Speed"	1500 rpm

Table 41

"PTO to Set Speed Engine Operation"
Frame 1
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is OFF. The Set/Resume switch is set to OFF.	Start the engine.	The engine is at the programmed Low Idle of 700 rpm. Programmed Low Idle rpm for H/D engines is 600 rpm.	700 rpm 600 rpm H/D

Table 42

"PTO to Set Speed Engine Operation"
Frame 2
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The Set/Resume switch is set to OFF.	Turn the PTO On/Off switch to the ON position.	The engine will ramp to the programmed "PTO Engine RPM Set Speed".	1500 rpm

Multiple Speed PTO Operation by Using the PTO Engine RPM Set Speed "Input A" and PTO Engine RPM Set Speed "Input B"

JULY99 and later personality modules

The following is for the Medium Duty Engines M/D. 3126B, 3126E, C7, and C9

PTO Engine RPM Set Speed A must be programmed to J1/P1:46 Input 7. PTO Engine RPM Set Speed B can be programmed to J1/P1:7 Input 4 or J1/P1:23 Input 19. A desired engine rpm can then be programmed for each input (PTO Engine RPM Set Speed A and PTO Engine RPM Set Speed B).

The following is for the Heavy Duty Engines H/D. C-10, C11, C-12, C13, 3406E, C15, C-15, C-16, and C-18

PTO Engine RPM Set Speed A or PTO Engine RPM Set Speed B must be programmed to any of the following terminals:

• J1/P1:6

• J1/P1:46

• J1/P1:58

• J1/P1:60

A desired engine rpm can then be programmed for each input (PTO Engine RPM Set Speed A and PTO Engine RPM Set Speed B).

Perform the following functions so that the engine will proceed to the corresponding rpm that is programmed for the PTO Engine RPM Set Speed "Input A" or PTO Engine RPM Set Speed "Input B":

• Turn the PTO On/Off Switch to the ON position.

• Turn the switch for the PTO Engine RPM Set Speed "Input A" or the PTO Engine RPM Set Speed "Input B" to the ON position.

If both switches are ON, the engine will proceed to PTO Engine RPM Set Speed "A" because the PTO Engine RPM Set Speed "Input A" has priority over "Input B". If switch "A" is then turned OFF, the engine will proceed to the programmed PTO Engine RPM Set Speed "B". If switch "A" is then turned ON, then the engine will proceed back to the PTO Engine RPM Set Speed "A". If both switches are in the OFF position, then the engine will return to Low Idle.

Example 1

Table 43

Example 1 of the Parameter Programming for the "Multiple Speed PTO Operation" by Using the PTO Engine RPM Set Speed "Input A" and PTO Engine RPM Set Speed "Input B"
"PTO Engine RPM Set Speed A"	1500 rpm
"PTO Engine RPM Set Speed B"	1200 rpm

Table 44

Example 1 for the "Multiple Speed PTO Operation" by Using the PTO Engine RPM Set Speed "Input A" and PTO Engine RPM Set Speed "Input B"
Frame 1
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is OFF. The "PTO Engine RPM Set Speed A" is OFF. The "PTO Engine RPM Set Speed B" is OFF.	Start the engine.	The engine is at the programmed Low Idle of 700 rpm. Programmed Low Idle rpm for H/D engines is 600 rpm.	700 rpm 600 rpm H/D

Table 45

Example 1 for the "Multiple Speed PTO Operation" by Using the PTO Engine RPM Set Speed "Input A" and PTO Engine RPM Set Speed "Input B"
Frame 2
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The "PTO Engine RPM Set Speed A" is OFF. The "PTO Engine RPM Set Speed B" is OFF.	Turn the PTO On/Off switch to the ON position.	The engine is at the programmed Low Idle of 700 rpm. The programmed Low Idle for H/D engines is 600 rpm.	700 rpm 600 rpm H/D

Table 46

Example 1 for the "Multiple Speed PTO Operation" by Using the PTO Engine RPM Set Speed "Input A" and PTO Engine RPM Set Speed "Input B"
Frame 3
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The "PTO Engine RPM Set Speed A" is ON. The "PTO Engine RPM Set Speed B" is OFF.	Turn the PTO On/Off switch to the ON position. Turn the "PTO Engine RPM Set Speed A" to the ON position.	The engine is now at the programmed "PTO Engine RPM Set Speed A".	1500 rpm

Table 47

Example 1 for the "Multiple Speed PTO Operation" by Using the PTO Engine RPM Set Speed "Input A" and PTO Engine RPM Set Speed "Input B"
Frame 4
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The "PTO Engine RPM Set Speed A" is ON. The "PTO Engine RPM Set Speed B" is ON.	Turn the "PTO Engine RPM Set Speed B" to the ON position.	The engine will remain at the programmed "PTO Engine RPM Set Speed A". NOTE:Set Speed "A" has priority over Set Speed "B".	1500 rpm

Table 48

Example 1 for the "Multiple Speed PTO Operation" by Using the PTO Engine RPM Set Speed "Input A" and PTO Engine RPM Set Speed "Input B"
Frame 5
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The "PTO Engine RPM Set Speed A" is OFF. The "PTO Engine RPM Set Speed B" is ON.	Turn the "PTO Engine RPM Set Speed A "to the OFF position.	The engine will go to the programmed "PTO Engine RPM Set Speed B".	1200 rpm

Table 49

Example 1 for the "Multiple Speed PTO Operation" by Using the PTO Engine RPM Set Speed "Input A" and PTO Engine RPM Set Speed "Input B"
Frame 6
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The "PTO Engine RPM Set Speed A" is ON. The "PTO Engine RPM Set Speed B "is ON.	Turn the "PTO Engine RPM Set Speed A" to the ON position.	The engine is at programmed "PTO Engine RPM Set Speed A". NOTE: Set Speed "A" has priority over Set Speed "B".	1500 rpm

Table 50

Example 1 for the "Multiple Speed PTO Operation" by Using the PTO Engine RPM Set Speed "Input A" and PTO Engine RPM Set Speed "Input B"
Frame 7
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is OFF. The "PTO Engine RPM Set Speed A" is ON. The "PTO Engine RPM Set Speed B" is ON.	Turn the PTO On/Off switch to the OFF position.	The engine is at the programmed Low Idle of 700 rpm. The programmed Low Idle for H/D engines is 600 rpm.	700 rpm 600 rpm H/D

Table 51

Example 1 for the "Multiple Speed PTO Operation" by Using the PTO Engine RPM Set Speed "Input A" and PTO Engine RPM Set Speed "Input B"
Frame 8
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The "PTO Engine RPM Set Speed A" is ON. The "PTO Engine RPM Set Speed B" is ON.	Turn the PTO On/Off switch to the ON position.	The engine is at programmed "PTO Engine RPM Set Speed A". NOTE:Set Speed "A" has priority over Set Speed "B".	1500 rpm

Example 2

The switches for the PTO Engine RPM Set Speed "A" or "B" can also be used in conjunction with other features that control engine speed during PTO operation. Set Speed "A" and Set Speed "B" have priority over all of the other features that are used to adjust engine rpm. Table 52 describes the interaction between the parameter for the PTO to Set Speed and the parameter for the PTO Engine RPM Set Speed. The parameter for the PTO to Set Speed is programmed to YES.

Note: The feature for the "PTO Engine RPM Set Speed" is not available for the "Remote Throttle PTO Configuration". The PTO Engine RPM Set Speed "A" and the PTO Engine RPM Set Speed "B" are available for all three PTO configurations.

Table 52

Example 2 for the Parameter Programming for the "Multiple Speed PTO Operation" by Using the PTO Engine RPM Set Speed "Input A" and PTO Engine RPM Set Speed "Input B"
"PTO to Set Speed"	Yes
"PTO Engine RPM Set Speed"	1000 rpm
PTO Engine RPM Set Speed "A"	1500 rpm
PTO Engine RPM Set Speed "B"	1200 rpm

Table 53

Example 2 for the "Multiple Speed PTO Operation" by Using the PTO Engine RPM Set Speed "Input A" and PTO Engine RPM Set Speed "Input B"
Frame 1
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is OFF. The "PTO Engine RPM Set Speed A" is OFF. The "PTO Engine RPM Set Speed B" is OFF.	Start the Engine.	The engine is at the programmed Low Idle of 700 rpm. Programmed Low Idle for H/D engines is 600 rpm.	700 rpm 600 rpm H/D

Table 54

Example 2 for the "Multiple Speed PTO Operation" by Using the PTO Engine RPM Set Speed "Input A" and PTO Engine RPM Set Speed "Input B"
Frame 2
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The "PTO Engine RPM Set Speed A" is OFF. The "PTO Engine RPM Set Speed B" is OFF.	Turn the PTO On/Off Switch to the ON position.	The engine is at the programmed "PTO Engine RPM Set Speed" of 1000 rpm.	1000 rpm

Table 55

Example 2 for the "Multiple Speed PTO Operation" by Using the PTO Engine RPM Set Speed "Input A" and PTO Engine RPM Set Speed "Input B"
Frame 3
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The "PTO Engine RPM Set Speed A" is ON. The "PTO Engine RPM Set Speed B" is OFF.	Turn the "PTO Engine RPM Set Speed A" to the ON position.	The engine is now at the programmed "PTO Engine RPM Set Speed A". NOTE: Set Speed "A" has priority over Set Speed "B". Set Speed "A" also has priority over the PTO to Set Speed.	1500 rpm

Table 56

Example 2 for the "Multiple Speed PTO Operation" by Using the PTO Engine RPM Set Speed "Input A" and PTO Engine RPM Set Speed "Input B"
Frame 4
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The "PTO Engine RPM Set Speed A" is ON. The "PTO Engine RPM Set Speed B" is ON.	Turn the "PTO Engine RPM Set Speed B" to the ON position.	The engine will remain at the programmed "PTO Engine RPM Set Speed A". NOTE: Set Speed "A" has priority over Set Speed "B". Set Speed "A" also has priority over the PTO to Set Speed.	1500 rpm

Table 57

Example 2 for the "Multiple Speed PTO Operation" by Using the PTO Engine RPM Set Speed "Input A" and PTO Engine RPM Set Speed "Input B"
Frame 5
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The "PTO Engine RPM Set Speed A" is OFF. The "PTO Engine RPM Set Speed B" is ON.	Turn the "PTO Engine RPM Set Speed A" to the OFF position.	The engine will go to the programmed "PTO Engine RPM Set Speed B". NOTE: Set Speed "B" has priority over the PTO to Set Speed.	1200 rpm

Table 58

Example 2 for the "Multiple Speed PTO Operation" by Using the PTO Engine RPM Set Speed "Input A" and PTO Engine RPM Set Speed "Input B"
Frame 6
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The "PTO Engine RPM Set Speed A" is OFF. The "PTO Engine RPM Set Speed B" is OFF.	Turn the "PTO Engine RPM Set Speed B" to the OFF position.	The engine is at programmed "PTO Engine RPM Set Speed".	1000 rpm

Table 59

Example 2 for the "Multiple Speed PTO Operation" by Using the PTO Engine RPM Set Speed "Input A" and PTO Engine RPM Set Speed "Input B"
Frame 7
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is OFF. The "PTO Engine RPM Set Speed A" is OFF. The "PTO Engine RPM Set Speed B" is OFF.	Turn the PTO On/Off switch to the OFF position.	The engine is at the programmed Low Idle of 700 rpm. Programmed Low Idle for H/D engines is 600 rpm.	700 rpm 600 rpm H/D

Table 60

Example 2 for the "Multiple Speed PTO Operation" by Using the PTO Engine RPM Set Speed "Input A" and PTO Engine RPM Set Speed "Input B"
Frame 8
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The "PTO Engine RPM Set Speed A" is OFF. The "PTO Engine RPM Set Speed B" is ON.	Turn the PTO On/Off switch to the ON position. Turn the "PTO Engine RPM Set Speed B" to the ON position.	The engine is at programmed "PTO Engine RPM Set Speed B".	1200 rpm

Programmable "Torque Limit"

Programming the parameter for the "Torque Limit" provides an engine torque limit for PTO operation or other special situations. This feature should only be used for temporary protection of equipment. The programmable range for this parameter is 136 to 2720 N·m (100 to 2000 lb ft). The range is in 1 N·m (1 lb ft) increments. Programming the "Torque Limit" above the rated torque of the engine will not provide additional torque. The engine will operate using the normal torque curve whenever the normal torque is less than the programmed value of the "Torque Limit".

The tables demonstrate the Torque Limit for the PTO. The tables also demonstrate the "Torque Limit" when the PTO is OFF. The "Torque Limit" operates when the PTO On/Off switch is ON. When the PTO On/Off switch is OFF and the Torque Limit Switch is ON, the "Torque Limit" will operate. Refer to Electronic PTO Installation and Applications Guide for Electronic Engines, "Cab Switches with Torque Limiting and Ignore Brake/Clutch Switch" for more information if the configuration for the PTO is programmed to Cab Switches.

Refer to Electronic PTO Installation and Applications Guide for Electronic Engines, "Remote Switches with Torque Limiting and Ignore Brake/Clutch Switch" for more information if the configuration for the PTO is programmed to Remote Switches.

The Torque Limit switch should be part of the system that requires the torque limit. Program the "Torque Limit" to the torque that is rated for the device that is protected by the Torque Limit.

NOTE: The programmed torque level is an estimate. To achieve precise torque limiting, a chassis dynamometer may be required.

Illustration 1	g01110512
(1) Engine Speed (RPM) (2) Torque (3) Normal Engine Torque Curve (4) Programmed Torque Limit

Illustration 2	g01110516
(1) Engine Speed (RPM) (2) Torque (4) Programmed Torque Limit

Operation of the "Torque Limit" With PTO On/Off Switch

Table 61

Parameter Programming
"PTO Configuration"	Cab Switches, Remote Switches, or Remote Throttle
"Torque Limit"	The value should be below rated torque of the engine.

Table 62

Controlling Equipment	Action that was taken by the Operator of the PTO	Result
The PTO On/Off switch is OFF.	Start the engine.	The normal engine torque is used. Refer to Illustration 1.
The PTO On/Off switch is ON.	Turn the PTO On/Off switch to the ON position.	The Torque Limit that has been programmed is activated. This will reduce the torque that is available. Refer to Illustration 2.

Operation of the "Torque Limit" With A Torque Limit Switch

Table 63

Parameter Programming
"PTO Configuration"	Cab Switches, Remote Switches, or Remote Throttle
"Torque Limit"	The value should be below rated torque of the engine.

Table 64

Controlling Equipment	Action that was taken by the Operator of the PTO	Result
The PTO On/Off switch is OFF. The Torque Limit switch is OFF.	Start the engine.	The normal engine torque is used. Refer to Illustration 1.
The PTO On/Off switch is OFF. The Torque Limit switch is ON.	Turn the Torque Limit switch to the ON position.	The Torque Limit that has been programmed is activated. This will reduce the torque that is available. Refer to Illustration 2.

"PTO Cab Throttle RPM Limit"

Note: The PTO Top Engine Limit (PTO TEL) can be programmed anywhere between the Low Idle Speed and the Top Engine Limit.

The "PTO Cab Throttle RPM Limit" is active when the "PTO Configuration" is programmed to Cab Switches. The accelerator in the cab is always limited to low idle when the PTO Configuration is programmed to "Remote Switches". The accelerator position sensor that is in the cab is limited to the value of the "PTO Cab Throttle RPM Limit" only when the PTO On/Off circuit is in the ON position. This is useful for applications with equipment that may be damaged by engine overspeed. This parameter has three programmable choices. The following items are the three programmable choices: "Low Idle", "Top Engine Limit" and "PTO Top Engine Limit".

• If the "PTO Cab Throttle RPM Limit" is programmed to Low Idle, then the engine will not exceed the programmed Low Idle when the accelerator pedal is depressed. The PTO On/Off circuit must also be in the ON position. The accelerator pedal is ignored.

• If "PTO Cab Throttle RPM Limit" is programmed to the "Top Engine Limit", then depressing the accelerator pedal will allow the engine to achieve the programmed "Top Engine Limit".

• If "PTO Cab Throttle RPM Limit" is programmed to the "PTO Top Engine Limit", then depressing the accelerator pedal will allow the engine to reach the programmed "PTO Top Engine Limit". The PTO On/Off circuit must also be in the ON position.

The next three tables describe each of the three options that are for this parameter.

"PTO Cab Throttle RPM Limit" That is Programmed to Low Idle

Table 65

Parameter Programming for "PTO Cab Throttle RPM Limit" That is Programmed to Low Idle
"PTO Configuration"	Cab Switches
"PTO Top Engine Limit"	2100 rpm 2000 rpm H/D
"PTO Cab Throttle Limit"	Low Idle
"Top Engine Limit"	2640 rpm C7, 3126B, and 3126E 2350 rpm C9 2120 rpm H/D

Table 66

"PTO Cab Throttle RPM Limit" That is Programmed to Low Idle
Frame 1
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is OFF. The accelerator pedal is fully depressed.	Fully depress the accelerator pedal.	The engine will not exceed the programmed "Top Engine Limit" of 2640 rpm for C7, 3126B, and 3216E engines. The "Top Engine Limit" for C9 engines is 2350 rpm. The "Top Engine Limit" for H/D engines is 2120 rpm.	2640 rpm C7, 3126B, and 3126E 2350 rpm C9 2120 rpm H/D

Table 67

"PTO Cab Throttle RPM Limit" That is Programmed to Low Idle
Frame 2
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The accelerator pedal is fully depressed.	Turn the PTO On/Off switch to the ON position.	The engine will return to the Low Idle rpm of 700. Low Idle rpm for H/D engines is 600 rpm.	700 rpm 600 rpm H/D

"Cab Throttle RPM Limit" That is Programmed to The "Top Engine Limit"

Note: The PTO Top Engine Limit (PTO TEL) can be programmed anywhere between the Low Idle Speed and the Top Engine Limit.

Table 68

Parameter Programming for "Cab Throttle RPM Limit" That is Programmed to The "Top Engine Limit"
"PTO Configuration"	Cab Switches
"PTO Top Engine Limit"	2100 rpm 2000 rpm H/D
"PTO Cab Throttle Limit"	TEL
"Top Engine Limit"	2640 rpm C7, 3216B, and 3126E 2350 rpm C9 2120 rpm H/D

Table 69

"Cab Throttle RPM Limit" That is Programmed to The "Top Engine Limit"
Frame 1
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is OFF. The accelerator pedal is fully depressed.	Fully depress the accelerator pedal.	The engine will not exceed the programmed "Top Engine Limit" of 2640 rpm for C7, 3126B, and 3126E engines. The programmed "Top Engine Limit" for C9 engines is 2350 rpm. Programmed "Top Engine Limit" of 2120 rpm for H/D engines	2640 rpm C7, 3126B, and 3126E 2350 rpm C9 2120 rpm H/D

Table 70

"Cab Throttle RPM Limit" That is Programmed to The "Top Engine Limit"
Frame 2
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The accelerator pedal is fully depressed.	Turn the PTO On/Off switch to the ON position.	The engine will remain at the "Top Engine Limit" of 2640 rpm for C9, 3126B, and 3126E engines. The "Top Engine Limit" is 2350 rpm for the C9 engine. The "Top Engine limit" is 2120 rpm for H/D engines.	2640 rpm C7, 3126B, and 3126E 2350 rpm C9 2120 rpm H/D

"Cab Throttle RPM Limit" That is Programmed to The "PTO Top Engine Limit"

Note: The PTO Top Engine Limit (PTO TEL) can be programmed anywhere between the Low Idle Speed and the Top Engine Limit.

Table 71

Parameter Programming for "Cab Throttle RPM Limit" That is Programmed to The "PTO Top Engine Limit"
"PTO Configuration"	Cab Switches
"PTO Top Engine Limit"	2100 rpm 2000 rpm H/D
"PTO Cab Throttle Limit"	PTO TEL
"Top Engine Limit"	2640 rpm C7, 3126B, and 3126E 2350 rpm C9 2120 rpm H/D

Table 72

"Cab Throttle RPM Limit" That is Programmed to The "PTO Top Engine Limit"
Frame 1
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is OFF. The accelerator pedal is fully depressed.	Fully depress the accelerator pedal.	The engine will accelerate to the programmed "Top Engine Limit" of 2640 rpm for the C7, 3126B, and 3126E engines. The "Top Engine Limit" is 2350 rpm for the C9 engine. The Programmed "Top Engine Limit" is 2120 rpm for H/D engines.	2640 rpm C7, 3126B, and 3126E 2350 rpm C9 2120 rpm H/D

Table 73

"Cab Throttle RPM Limit" That is Programmed to The "PTO Top Engine Limit"
Frame 2
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The accelerator pedal is fully depressed.	Turn the PTO On/Off switch to the ON position.	The engine will decelerate to the "PTO Top Engine Limit" of 2100 rpm. The "PTO Top Engine Limit" is 2000 rpm for H/D engines.	2100 rpm 2000 rpm H/D

"Idle/PTO RPM Ramp Rate"

The "Idle/PTO RPM Ramp Rate" determines the rate of acceleration and deceleration of the engine when the engine rpm is changing. This happens because of the actuation of the following items: Set/Resume switch, "Idle/PTO Bump RPM", "PTO to Set Speed" and parameters for the "PTO Engine RPM Set Speed". The "Idle/PTO RPM Ramp Rate" is not applicable to the acceleration and the deceleration of the engine due to an accelerator position sensor.

The parameter is programmed in one rpm per second increments from 5 to 1000 rpm per second. This parameter should be programmed in order to match the application. Some applications have a reduced cycle time that is critical. This will provide reduced cycle times for those applications. Programming excessive ramp rates may stress the driven equipment.

"Idle/PTO Bump RPM"

The "Idle/PTO Bump RPM" can be programmed to change the engine rpm when the Set/Resume switch is toggled. This parameter determines the change in rpm when the Set/Resume switch is toggled. If the "PTO Engine RPM Set Speed" is programmed to one rpm or above, then the parameter is overridden.

Note: The "Idle/PTO Bump RPM" can not be used with the "Fast Idle" operation. The Fast Idle RPM is not set or changed with the Cruise Control Set/Resume switch.

Table 74

Parameter Programming for "Idle/PTO Bump RPM"
"PTO to Set Speed"	NO
"PTO Engine RPM Set Speed"	0 rpm
"Cruise/Idle/PTO Switch Configuration"	Set/Accelerate
"Idle/PTO Bump RPM"	400 rpm
"PTO Top Engine Limit"	1800 rpm

Table 75

"Idle/PTO Bump RPM"
Frame 1
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is OFF. The Set/Resume switch is OFF.	Start the engine.	The engine will remain at the Low Idle of 700 rpm. Low Idle rpm for H/D engines is 600 rpm.	700 rpm 600 rpm H/D

Table 76

"Idle/PTO Bump RPM"
Frame 2
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The Set/Resume switch is OFF.	Turn the PTO On/Off switch to the ON position.	The engine will remain at the Low Idle of 700 rpm because the "PTO to Set Speed" is programmed to NO.	700 rpm 600 rpm H/D

Table 77

"Idle/PTO Bump RPM"
Frame 3
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The Set/Resume switch is in the SET position.	Quickly toggle the Set/Resume switch to the SET position and then release.	The engine will accelerate 400 rpm. This is the Idle/PTO Bump RPM value. The engine rpm is now 1100. The engine rpm will now be 1400 rpm for H/D engines.	1100 rpm 1400 rpm H/D

Table 78

"Idle/PTO Bump RPM"
Frame 4
Controlling Equipment	Action that was taken by the Operator of the PTO	Result	Resultant Engine RPM
The PTO On/Off switch is ON. The Set/Resume switch is in the SET position.	Quickly toggle the Set/Resume switch to the SET position and then release.	The engine will accelerate 400 rpm. This is the Idle/PTO Bump RPM value. The engine rpm is now 1500. The engine rpm will now be 1800 rpm for H/D engines.	1500 rpm 1800 rpm H/D

"PTO Vehicle Speed Limit"

The parameter for the "PTO Vehicle Speed Limit" is used to disable a "PTO Set Speed" when the vehicle speed exceeds the programmed limit. The PTO On/Off switch operates the "PTO Vehicle Speed Limit". The programmable range is 2 to 204 km/h (1 to 127 mph) in increments of one. By programming the parameter to one, the PTO Set RPM will be disabled while the vehicle is moving. The following item will cause disengagement of an active set rpm: exceeding the "PTO Vehicle Speed Limit".

Note: A PTO that is driven by the transmission will produce a vehicle speed signal. Program the parameter for the "PTO Vehicle Speed Limit" to the maximum value of 204 km/h (127 mph) instead of disconnecting the vehicle speed circuit during the operation of the PTO. This will ensure that the "PTO Set Speed" will not be disabled due to vehicle speed.

Note: In some instances, a false vehicle signal can be produced during the operation of the PTO due to the movement of the drive train. If the parameter for the "PTO Vehicle Speed Limit" is programmed to a very low value, then the operation of the PTO will abort when the false vehicle speed exceeds the programmed limit. It may be necessary to isolate the source of the false speed signal. The "PTO Vehicle Speed Limit" can also be programmed to a higher value.

"Cruise/Idle/PTO Switch Configuration"

This parameter will determine the ACCEL and DECEL function of both the Cruise Control On/Off switch and the PTO On/Off switch. The switch can be used for the Set/Resume switch or the switch can be held in position for a constant acceleration. The default positions follow: The Set position is the ACCEL position and the Resume position is the DECEL position. This can be changed by using the Caterpillar Electronic Technician (ET).

Note: The set switch serves as the RPM Increase position and the Resume switch serves as the RPM Decrease position under the following conditions: The PTO On/Off switch is in the ON position. and The "PTO Engine RPM Set Speed" is programmed to one rpm or more. This is regardless of the programmed setting for the "Cruise/Idle/PTO Switch" configuration.

"Engine Monitoring"

An engine monitoring function is available for the engines. The parameter can be programmed to Off, Warning, Derate or Shutdown. Refer to the engine Operation and Maintenance Manual for additional information regarding this feature.

Show/hide table

If Engine Monitoring is programmed to "Derate" or "Shutdown", and one of the monitored conditions is exceeded, then the engine will derate or shutdown. This should be considered especially if derating or shutting the engine down during PTO operation. This could present a problem for the vehicle or possible injury to the operator.