Procedure for Extending/Retracting the PM-102 Right Rear Leg{7224} Caterpillar

Cold Planer:

PM-102 (S/N: Z2X1-UP)

Introduction

This Special Instruction provides the information that is necessary for the designated process in order to extend or retract the PM-102 right rear leg.

Do not begin this procedure until you have read the information that is contained in this instruction.

Required Parts

No new parts are required for this procedure.

Extension/Retraction Procedure

Note: The machine must only be operated with the right rear leg in the full retracted position or the full extended position.

Note: Use the following procedure to extend/retract the leg.

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Illustration 1	g02074573
Right console (1) Propel control (2) Rear left column height control (3) Rear right column height control (4) Stand by/On switch (5) Stop switch

1. For best results, park the machine on a flat, level, hard surface, such as asphalt or concrete. If at all possible, do not attempt to extend/retract on soil.

   Note: A sheet of plywood can be placed under the rotor in order to prevent breakage of the cutting bits. However, the plywood should be only the width of the rotor. The left and right rotor chamber side plates must not contact the plywood.

2. Ensure that the propel control (1) is in the NEUTRAL position.

3. Ensure that the standby/on switch (4) is in the OFF (O) position.

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Illustration 2	g02149608
Right side of instrument panel (6) Conveyor switch (7) Water spray switch (8) Rotor switch (9) Left side plate switch (10) Right side plate switch (11) Anti slab switch

4. Ensure that the conveyor switch (6) is in the OFF (O) position.

5. Ensure that the water spray switch (7) is in the OFF (O) position.

6. Ensure rotor switch (8) is in the OFF (O) position.

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Illustration 3	g02144381
Left side of instrument panel (12) Main height leg control lever (13) Right rear column height indicator (14) Front leg service height switch (15) Right rear leg rotation enable switch (16) Right rear leg rotation switch (17) Electrical system disabled lamp (18) Machine control enable switch (19) Electrical system enabled lamp (20) Right rear leg unlocked indicator

7. After the engine is started, press the machine control enable switch (18) to enable all machine functions.

8. The electrical system enabled lamp (19) should illuminate. Also, the electrical system disabled lamp (17) should go out, when the machine control enable switch (18) is pressed.

9. Refer to Illustration 1. Use the rear left column height control (2) and the rear right column height control (3), to raise the legs. Lower the machine by raising the legs until the rotor contacts the ground. Stop raising the legs when both the track or wheel assemblies are 25 mm (1.0 inch) off the ground.

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Illustration 4	g02138277

10. When the rotor is on the ground, slightly lower the left rear leg to provide support for the left side of the machine. Lower the leg until the track or wheel assembly touches the ground, but not enough to raise the left side plate. The left rear height indicator should be at the position shown in Illustration 4.

11. Refer to Illustration 2. Move left side plate switch (9) to the LIFT position. Release the left side plate switch (9). The switch will return to the FLOAT position.

12. Refer to Illustration 2. Move the right side plate switch (10) to the LIFT position. Release the right side plate switch (10). The switch will return to the FLOAT position.

    Note: Both the left and the right side plates should float freely, and are able to float all the way down. If there is milling debris between the rotor housing and the side plates, the milling debris will obstruct free movement. The space will have to be cleaned before attempting to extend or retract the column.

13. Refer to Illustration 2. Move the anti slab switch (11) to the FLOAT position.

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Illustration 5	g02075740
(21) Right front engine access door

14. Open the right front engine access door (21) .

Note: There is a lower position sensor and an upper position sensor in the right rear column. The right rear column height indicator (13) turns ON when the lower sensor is activated as the leg is raised. Right rear column height indicator (13) will turn OFF if the leg is raised to the point where the upper sensor is activated.

Note: The best starting point for extending or retracting the leg is the point where the lower sensor has been activated.

15. Refer to Illustration 1. Use right rear leg height control (3) and raise the right rear leg until the right rear column height indicator (13) turns ON. See Illustration 3. This function allows the leg to extend or retract.

Note: The assembly extends or retracts past the housing allowing for maximum clearance between the track or the wheel assembly and the rotor housing.

16. Refer to Illustration 3. Ensure that front leg service height switch (14) is in the OFF (O) position. Use the main leg height control lever (12) in order to raise the front legs of the machine to maximum the operating height.

17. Refer to Illustration 1. Press the stop switch (5) on the arm rest.

18. Refer to Illustration 3. When the stop switch (5) is pressed, the electrical system enabled lamp (19) will go out and the electrical system disabled lamp (17) will illuminate.

19. Move the right rear leg rotation enable switch (15) to the ON (I) position.

20. A message stating rear rh column drive enabled should momentarily flash on the display.

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Illustration 6	g02138280
(A) Extended (B) Retracted

21. To extend the leg, move the right rear leg rotation switch (16) to the right.

22. To retract the leg, move the right rear leg rotation switch (16) to the left.

23. Refer to Illustration 3. Move the right rear leg rotation enable switch (16) to the OFF (O) position. A message stating column drive routine disabled should momentarily flash on the display.

24. Refer to Illustration 1. To enable the machine controls, lift the stop switch (5) .

25. Refer to Illustration 3. Press the machine control enable switch (18) .

26. Refer to Illustration 3. After the machine controls are enabled, the right rear leg unlocked indicator (20) will flash one time, indicating that the leg is locked in place.

27. If a fault locking rh rear column message appears on the display, and the right rear leg unlocked indicator (20) remains illuminated, the column lock pins did not engage. Repeat Steps 17 through Step 26.

28. Refer to Illustration 1. Use the rear leg height controls (2) and (3) to lower the rear legs to the ground.

29. Close right front engine access door (21) .

30. The machine is ready to resume work.

Troubleshooting the PM-102 Right Rear Leg Extension/Retraction

No Faults on Display. Right Side Plate or Rotor Housing Interferes with the Track or Wheel Assembly During Extension or Retraction

Illustration 7	g02076314

Illustration 7 shows clearance (C) between track pads (D) and right side plate (24) and rotor housing (25). This clearance appears when the machine is properly positioned to obtain maximum clearance. Also note clearance (E) between the side plate stop (26) and the side plate guide (27) .

Maximum clearance is obtained when the machine is positioned according to the procedures in Steps 10, 15 and 16. The side plates should float down per the NOTE that follows Steps 11 and 12.

However, in certain conditions it might be possible to increase clearance (C) by either slightly raising or lowering the left rear leg per Step 10. Or by slightly raising the right rear leg per Step 15. Or by slightly raising the front legs per Step 16.

Note: Refer to Illustration 3. To raise the front legs above operating height, it is necessary to switch the front leg service height switch (14) to the ON (I) position. Then use the main leg height control lever (12) to raise the front legs too slightly above the maximum operating height.

Extension or Retraction Faults on Display - Leg Fails to Extend or Retract

Illustration 8	g02076454
Rotary position sensor

Illustration 9	g02077493
Linear position sensor

Illustration 10	g02077579
Lower and upper column position sensors (G) Upper sensor (H) Lower sensor

Illustration 11	g02077655
Right rear leg rotation enable switch

Illustration 12	g02077658
Horizontal locking cylinder proximity sensor

Note: Illustrations 8 through 12 shows locations of the sensors and the switches that are used to extend or retract the right rear leg. These switches and sensors are used to troubleshoot the right rear leg rotation faults.

Illustration 13	g02095593
PM-102 Power distribution and machine starting

Illustration 13 is an electrical schematic of (S/N: Z2X) prefix power distribution. (S/N: Z1X) is similar. Use the schematic in order to troubleshoot the relays and the switches in the right rear leg rotation circuits.

Illustration 14	g02098574
PM-102 Right rear column swing control electrical circuit

Illustration 14 is an electrical schematic that shows the following components that connect to the machines ECM: sensors, switches, relays, indicators and circuitry. Use in order to troubleshoot the right rear leg rotation.

Illustration 15	g02096017
PM-102 Right rear column swing control (Swing out, rotate clockwise (Retract))

Illustration 15 is a hydraulic schematic that shows the following components that extend or retract the leg: actuator, cylinders and valves. Use to troubleshoot right rear leg rotation.

Below are six faults that can occur when extending or retracting the right rear leg:

• Rear RH track alignment sensor fault (Indicates an issue with the right rear leg rotary position sensor for the rotary actuator that rotates the column as the column extends or retracts.)

• Rear RH column drive sensor fault (Indicates an issue with the linear position sensor in the hydraulic cylinder that extends or retracts the right rear leg.)

• Rear RH column drive control fault (Indicates an issue with the right rear leg rotation enable switch or the right rear leg rotation switch.)

• Fault locking RH rear column (Indicates an issue with the proximity sensor in the hydraulic horizontal locking pin.)

• Rear RH column microswitch not enabled (Indicates an issue with either the lower position sensor and/or the upper position sensor in the right rear leg.)

• Column badly positioned please end routine (Feedback from the linear position sensor and the rotary position sensor indicates the right rear leg is not fully extended nor fully retracted.)

Troubleshooting Fault 1 (Rear RH Track Alignment Sensor Fault) and Fault 2 (Rear RH Column Drive Sensor Fault) Using the Display

The track alignment sensor and column drive sensor are calibrated when either Calibration 6 (Track) or Calibration 4 (Wheel) is performed.

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Illustration 16	g02079754

1. In order to check stored values, access Calibration Menu using Rear Column Sensors - Calibrate procedure given in TEST AND ADJUST, QENR2011. The screen shown in Illustration 16 will appear.

2. Write down the stored values for the following: rear alignment min, rear alignment max, rear column min and rear column max. Also note the actual values of both sensors.

   Note: Illustration 16 is from a track machine. A wheel machine will have the same rear alignment min and rear alignment max values. However, a rear column min and rear column max values will be lower by approximately 650 min and 9100 max.

3. Press ESC twice to return to main screen without changing any calibration values.

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Illustration 17	g02079797

4. Press 4 twice. Screen shown in Illustration 17 will appear.

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Illustration 18	g02079799

5. Press 2 to enter the analog input screen. The screen shown in Illustration 18 will appear.

• The leg is in the retracted position in Illustration 18. Note the values in the column rotary sensor duty field (1010) and the column arm position mv field (9560).

• The value displayed for column rotary sensor duty corresponds to the rear alignment min and the rear alignment max values that were previously noted. These values were for the rotary position sensor.

• The value displayed for column arm position mV corresponds to rear column min and rear column max values previously noted. These values were for the linear position sensor.

• The column rotary sensor duty value of 1010 is close to the rear alignment min value of 990 shown in Illustration 16.

• The column arm position mV value of 9560 is close to the rear column max value of 9560 shown in Illustration 16.

• As the leg is extended, the column rotary sensor duty value should increase smoothly and steadily. The value should increase from 1010 to about 4824 (4824 = value shown in Rear alignment max field of 16).

• Also, as the leg is extended, the column arm position mV value should decrease smoothly and steadily. The value should decrease from 9560 to about 970 (970 = value shown in rear column min field of Illustration 16.

• If the values do not change smoothly and steadily, or if there is a large discrepancy between the calibrated values and the actual values, there could be a problem with the rotary position sensor. Also, there could be a problem with the linear position sensor.

Troubleshooting Fault 3 (Rear RH Column Drive Control Fault), Fault 4 (Fault Locking RH Rear Column), Fault 5 (Rear RH Column Microswitch Not Enabled) Using the Display

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Illustration 19	g02083034
(J) "Fault 3" and "Fault 4" indicators

1. Press 4 twice. The screen shown in Illustration 17 will appear.

2. Press 1 to enter the digital Input screen shown in Illustration 19

Refer to Illustration 14. All sensors and switches for extending or retracting the leg are inputs to the machines ECM. The machines ECM sends sensor and switch information to the display using the CAN Data Link

Illustration 19 shows the inputs after the machine has been positioned to extend or retract the leg and the stop switch has been pressed. Note the four lights (J) at lower right.

Column high position sensor refers to the lower column position sensor (proximity switch "C113") and the Upper Column Position Sensor (Proximity Switch "C114"). This sensor was referenced in Illustration 10.

If the column high position sensor light remains red after the machine has been positioned to extend or retract the leg and the stop switch has been pressed, it is indicative that "fault 5" (rear rh column microswitch not enabled) has occurred. Troubleshoot using Illustrations 14 and Illustration 15 schematics.

Refer to Illustration 3. The column movement switch light will turn green when the rotation enable switch is set to the ON (I) position.

If the column movement switch light remains red after the rotation enable switch is set to the "ON (I)" position, it is indicative that "fault 3" (rear rh column drive control fault) has occurred. Troubleshoot using Illustration 14 and Illustration 15 schematics.

Refer to Illustration 3. The column in-out switch light will turn green when the leg rotation switch is toggled to the left for retract. Or the light will turn green when the switch is toggled to the right for extend. The leg rotation switch is spring centered and if released, the leg rotation switch will return to the center and the light will turn red.

At the same time as the column in-out switch light turns green, the column locked light should turn red which indicates that both the horizontal column locking pin and the vertical column locking pin are retracted.

The column locked light should turn green after the following occurs:

• After the leg extension or retraction is complete

• When the rotation enable switch is set to the OFF (O) position

• The stop switch is lifted

• The enable switch is pressed

The column locked light turning green indicates that both the column locking pins have extended and the column is locked.

If "fault 4" occurs (fault locking rh rear column), troubleshoot pin lock switch "C120" using Illustration 14 and Illustration 15 schematics. Also, ensure that the pin lock switch can detect metal. If the hydraulic horizontal locking pin is over greased, the excess grease can prevent the magnetic pin lock switch from detecting metal.

Note: The CAN Data Link is not the likely issue for any leg rotation faults if other CAN functions work.

Troubleshooting Fault 6 (column badly positioned please end routine)

"Fault 6" indicates that the leg is not fully extended or fully retracted. The leg is positioned somewhere in between. "Fault 6" is usually an operator fault.

1. Turn the ignition key OFF. Lift the stop switch.

2. Place all the switches to the OFF (O) position.

3. Start the engine and enable the hydraulics.

4. Try initiating the leg extend or retract procedure again

   If the fault still occurs, check to see if the horizontal and vertical column locking pins have extended. This situation is with the leg not fully extended or fully retracted.

   If the fault has happened and if the locking pins will not retract after the controls have been cycled and the leg extend or retract procedure has been tried again, it might be necessary to stop the engine, and then loosen the lines to the base ends of both locking pins.

   Then, with the lines loose, push in the rods of the locking pins until fully retracted. Tighten the lines and try the extend or retract procedure again.

Front and/or Rear Steering Sensors on Display (Track Only) - Leg fails to Extend or Retract

Two Steering Faults can occur.

• Front steering sensor fault

• Rear RH track steering sensor fault

The right rear steering is always active. The right rear track sensor follows the front track sensor. When the hydraulics are active, and the front tracks are steered left or right, the right rear track should also steer left or right. This should be true in both extended and retracted positions.

However, when the leg extension or retraction routine is initiated, the right rear track should go to the straight position. This action should occur regardless of the position of the front tracks.

If either steering fault occurs, even if the fault is intermittent rather than continuous, the fault can cause the right rear track to remain angled. The angled position can cause interference between the rotor housing or right side plate and the track during extension or retraction.

Calibrate the sensors to eliminate fault occurrence. If one sensor is calibrated, the other will also need to be calibrated. Use the procedures given in Test and Adjust, QENR2011, "Front Steering Sensor (Track Machine) - Calibrate" and Test and Adjust, QENR2011, "Rear Steering Sensor (Track Machine) - Calibrate". Calibrate the front sensor first, then the rear sensor.

Illustration 20	g02083254

Illustration 20 shows the front sensor values after the default button "7" is pressed. The numbers in the lower fields are default values. The upper fields display actual values as the procedure is done. When calibrating the front sensor per step 17 of the Test and Adjust manual, do the following:

1. Press button "7" to set the sensor to the default values.

2. Turn the steering wheel to the FULL RIGHT position.

3. Reposition the front sensor mounting bracket on the front cylinder as needed if the value is not between 1915 and 1960.

   Note: The sensor low mV default value is 1900. The sensor low mV value displayed should be between 1915 and 1960.

4. Turn the steering wheel to FULL LEFT position.

   Note: The sensor high mV default value is 3600. The sensor high mV value displayed should be more than 3475 but less than 3595 when the mounting bracket is correctly positioned.

5. Turn the steering wheel to the CENTER position.

   Note: The sensor mid mV default value is 2900. The sensor mid mV value displayed should be 2900 ± 40 when the Sensor Mounting Bracket is correctly positioned.

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Illustration 21	g02079813

6. Use a straight edge to align the left front track frame with the main frame left side plate. See Illustration 21. Or visually align the components.

7. Press the "OK" button to save the calibration. The actual values in the upper fields will overwrite the default values in the lower fields.

Illustration 22	g02083396

Illustration 22 shows the rear sensor values. The numbers in the lower fields are default values. The upper fields display actual values as the procedure is done. When calibrating the rear sensor per Steps 23 through 32 of the Test and Adjust manual, do the following:

Press button "7" to set the sensor to the following default values.

• Rear steer min-in = 3450

• Rear steer max-in = 6100

• Rear steer mid = 5250

• Rear steer min-out = 4650

• Rear steer max-out = 5600

• Perform Steps 23 through 32 of the Test and Adjust manual. When the calibration is complete, note rear steer min in and rear steer max in values in the upper fields.

• Rear steer min in needs to be more than 3325 and less than 3750 (value displayed is 3661).

• Rear steer max in needs to be more than 6275 and less than 6700 (value displayed is 6410).

• If the rear steer min in and rear steer max in values are within tolerance, press the "OK" button to save the calibration. The actual values in the upper fields will overwrite the default values in the lower fields.

Illustration 23	g02083454
(K) Mounting holes line (L) Key line (M) 17 ± 1.5 degrees

If the values are not within the limits, the key for the rear steering sensor will need to be adjusted. Refer to Illustration 23.

1. In order to adjust the key, remove the rear steering sensor cover and the rear steering sensor. The key will be exposed.

2. Mark a reference line using the sensor mounting threaded holes (L) .

3. Mark another reference line using the key (K) .

4. Loosen the lock nut and adjust the key as needed to get the rear steer min in and rear steer max in values within tolerance. Nominal key angle should be 17 ± 1.5 degrees (M) .

   Note: Increasing the key angle will increase both values. Decreasing the key angle will decrease both values.

5. When complete, install the rear steering sensor and the rear steering sensor cover.

6. Perform Steps 23 through 32 of the Testing and Adjusting, QENR2011, "Rear Steering Sensor (Track Machine) - Calibrate" manual again, ensuring that the rear steer min in and rear steer max in values are within tolerance.

7. Press the "OK" button to save the calibration.

Electrical Characteristics of Sensors, Resistors, and Switches in PM102 Right Rear Leg Extension / Retraction Circuit

Right Rear Leg Rotary Actuator

Illustration 24	g02138416
Rotary position sensor (N) White dot (P) White dot

Refer to Illustration 8 for leg rotary position sensor and leg rotary actuator location.

Possible cause of a Rear RH Track Alignment Sensor Fault

• Measure sensor Duty Cycle by spooning a multi-meter between wires A571-PK signal Pin C and C234-BK ground Pin B

• Duty Cycle should be 11.7 percent (voltage is .57 v) when the leg is IN

• Duty Cycle should be 48.5 percent (voltage is 1.9 v) when the leg is OUT

• There should be 27 V to 970-GY power wire Pin A.

• The leg rotary position sensor has a 310 degree rotation range and orientation marks.

• The rotor needs to be properly oriented to the housing.

• Refer to Illustration 24. The white dot (P) on the rotor must line up with the white dot (N) on the housing when installed.

Control Valve Bank Solenoid Locations For the Leg Rotary Actuator

Solenoid A22 energizes to turn the leg counterclockwise. The voltage is 4 v in both the operational and the calibration modes.

Solenoid B22 energizes to turn the leg clockwise. The voltage is 4 v in both the operational and the calibration modes.

Right Rear Leg Swing Cylinder

Illustration 25	g02138417
Cylinder linear position sensor (R) White dot (S) White dot

Refer to Illustration 9 for cylinder linear position sensor and swing cylinder location.

Possible Cause of a Rear RH Column Drive Sensor Fault

• Measure sensor Voltage by spooning a multi-meter between wires M904-OR signal Pin C and C234-BK ground Pin B.

• Voltage should be 9.5 v when the leg is IN.

• Voltage should be 1 v when the leg is OUT.

• There should be 27 v to 970-GY power wire Pin A.

• The cylinder linear position sensor has orientation marks.

• The slide needs to be properly oriented to the wand.

• Refer to Illustration 25. The white dot on the slide (R) must line up with the white dot on the wand (S) when installed.

Control Valve Bank Solenoid Locations For the Leg Swing Cylinder

Solenoid A2 energizes to retract the leg IN. The voltage is 27 v in both the operational and the calibration modes.

Solenoid B2 energizes to extend the leg OUT. The voltage is 27 v in both the operational and the calibration modes.

Right Rear Leg Position Sensors

Refer to Illustration 10 for upper and lower leg position sensor locations.

Possible Cause of a Rear RH Column Microswitch Not Enabled Fault

• Measure lower leg sensor supply Voltage by spooning a multi-meter between wires 104-YL power Pin A and 200-BK ground Pin B.

• There should be 27 v at lower sensor when in the leg extend/retract mode, both operational and calibration.

• The lower sensor is NO. When (13) Right rear leg height indicator illuminates the lower sensor closes, and then there should be 27 v at wire J761-WH Pin C of the lower sensor. Refer to Illustration 3.

• There should also be 27 v at J761-WH Pin A of the upper leg sensor.

• The upper sensor is NC. When right rear leg height indicator (13) illuminates, the sensor opens, and then there should also be 27 v at wire 172-GN Pin A of the upper leg sensor.

• 172-GN is an input signal to Pin 6 of the Machine ECM which causes an ECM output signal on wire L929-WH in Pin 39 to (13) Right rear leg height indicator.

• If the right rear leg is lifted too high, the upper sensor will close. Right rear leg height indicator (13) will go out, and leg will not extend/retract.

Right Rear Leg Rotation Enable and Rotation Switches

Refer to Illustrations 3 and 11 for switch locations

Possible Cause of a Rear RH Column Drive Control Fault.

Voltage Checks Leg Rotation Enable Switch

• When stop switch (5) is pressed, there should be 27 v at wire 139-OR on Terminal 3 of the leg rotation enable switch. Refer to Illustration 1.

• When rotation enable switch is toggled on, 27 v goes through switch to wire 175-PK on Terminal 2 to the Machine ECM Pin 19.

Voltage Checks Leg Rotation Switch

• The leg rotation switch is a three position switch that is spring centered. Supply voltage to the leg rotation switch is from Pin 23 of Machine ECM to Terminal 2 wire 924-WH of switch.

• When the leg rotation switch is spring centered, there should be 2.15 v at T2, .780 v at T1, and 4.5 v at T3.

• When the leg rotation switch is toggled In to retract, there should be 1.1 v at T2. There should be 1.1 v at T1, And there should be 4.3 v at T3.

• When the leg rotation switch is toggled Out to extend, there should be 4.0 v at T2. There should be 1.4 v at T1. And there should be 4.0 v at T3.

Resistance Checks Leg Rotation Switch

Note: There is a 6-pin Deutsche receptacle resistor assembly on the leg rotation

• When resistance is measured from Pin 1 to Pin 2, the resistance should be 2.171 ohm

• When resistance is measured from Pin 1 to Pin 3, the resistance should be 2.634 ohm

• When resistance is measured from Pin 1 to Pin 5, the resistance should be 2.303 ohm

• When resistance is measured from Pin 1 to Pin 6, the resistance should be 1.486 ohm

• When resistance is measured from Pin 2 to Pin 3, the resistance should be 0.464 ohm

• When resistance is measured from Pin 2 to Pin 5, the resistance should be 4.471 ohm

• When resistance is measured from Pin 2 to Pin 6, the resistance should be 3.654 ohm

• When resistance is measured from Pin 3 to Pin 5, the resistance should be 4.931 ohm

• When resistance is measured from Pin 3 to Pin 6, the resistance should be 4.121 ohm

• When resistance is measured from Pin 5 to Pin 6, the resistance should be 0.817 ohm

• Pin 4 is blank

Right Rear Leg Horizontal Locking Cylinder Proximity Sensor

Refer to Illustration 12 for horizontal locking cylinder and proximity sensor locations

Possible cause of Fault locking RH rear column fault.

Voltage Checks

• When the rod of the horizontal lock cylinder is extended, there should be 27 v at T970-GY power (Pin C) and 27 v at T981-OR signal Pin A.

• When the rod of the horizontal lock cylinder is retracted, there should be 27 v at T970-GY power (Pin C) and 0 v at T981-OR signal Pin A.

• If the cylinder is extended and the proximity sensor reads 0 v Signal, a fault locking RH rear column will occur when hydraulics are activated.

• The sensor could be shorted to ground. There could be excessive grease in front of the sensor so the sensor cannot detect metal. Or the sensor could be out of adjustment.

• Conversely, if the cylinder is retracted and the proximity sensor reads 27 v signal at T981-OR, no fault will occur.

• The sensor could either be short to battery or be out of adjustment.

• Adjust sensor by turning until the sensor contacts the cylinder rod, then turn out a quarter to one third turn.

• If the proximity sensor reads 27 v Signal when the cylinder is retracted, the left radio button (CCW) and the right radio button (CW) radio buttons on the display, which rotate the column rotary actuator, will not work in the Calibration Mode.

Resistance Checks

• Sensor should measure 19.8 Ohms with + on Pin A and – on Pin B. If Polarity is reversed should measure OL.

• Sensor should measure 11.3 Ohms with + on Pin C and – on Pin B. If Polarity is reversed should measure OL.

• Sensor should measure OL with + on Pin A and – on Pin C. If Polarity is reversed should measure OL.

Track Machine Selector Solenoid Valve

Track Machines use solenoids A22 and B22 to control hydraulic oil flow to both the rear steering cylinder and the leg rotary actuator.

When the leg extend/retract function is enabled, in either the operational or the calibration mode, a selector solenoid valve is energized by the Machine ECM. This function will port oil to the rotary actuator.

When the leg rotation switch is toggled In or Out in the operational mode, there should be 27 v at N818-OR of the selector solenoid.

When the left or right radio buttons on the display are pushed in the calibration mode, there should be 27 v at N818-OR of the selector solenoid.

Signal wire N818 OR to selector solenoid is from Pin 33 of Machine ECM.

Miscellaneous Auxiliary System Pressure and Electrical Checks

Refer to Hydraulic Schematic, QENR2037 and Electrical Schematic, QENR2038.

When Machine control enable switch (18) is pushed, there should be 27 v at Solenoid A4 of the Control valve bank. Refer to Illustration 3.

After A4 is energized, there should be 20000 kPa (2900 psi) pressure at Test Port A-A

When stop switch (5) is pushed, A4 is de-energized. Refer to Illustration 1.

When in either the operational or the calibration modes for extending/retracting the leg, A4 is momentarily energized by wire T973-WH from Pin 34 of Machine ECM.

A4 is energized only when a radio button is pushed in the calibration mode, or the rotation switch is toggled in the operational mode.

In the calibration mode, either the down radio button (IN) or the up radio button (OUT) radio button for swinging the leg cylinder will need to be pushed first. This function will unlock the locking cylinders.

8000 kPa (1160 psi) is locked into the locking cylinders by the check valve in the sequence manifold. When A4 is momentarily energized, 20000 kPa (2900 psi) pressure unseats the check valve and is ported to the rod end of the locking cylinders.

After leg extension/retraction is complete, the rods in the horizontal and the vertical locking cylinders remain retracted. The cylinders will remain retracted until the Machine control enable switch (18) is pushed. When Machine control enable switch (18) is pushed, 8000 kPa (1160 psi), measured at Test Port C-C, extends the rods of the locking cylinders.

Changing Machine Type if either the Machine ECM or the Display is changed.

Both the machine ECM and the display have a default setting of track machine type. If a new component is installed to a wheel machine, the settings will need to be changed.

The right rear leg will not extend or retract if either the machine ECM or the display is set to the wrong Machine Type

The display setting can be changed by accessing setup menu per the procedures given in Testing and Adjusting, QENR2011.

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Illustration 26	g02138419
Machine type screen of the display

1. Use the down radio button to get to the screen that list machine type. Refer to Illustration 26 of Display.

2. Use number buttons to select either 1 for Track or 2 for Wheel.

3. Save the change, and push ESC.

The display setting can also be changed using Plus 1 Communications software.

Illustration 27	g02138420
Machine type screen Plus 1 Communications software tool

The Machine ECM setting will need to be changed with Plus 1 Communications Software.

Note: Plus I Communications Software and Pm102Main.P1D application file can be downloaded from SIS web Downloads.

1. Go to Machine Type Screen under Parameter Functions. Refer to Illustration 27, a screen shot from Plus 1.

   Row 1 (U) is the machine ECM.

   Row 2 (T) is the display.

   Note: Values in all fields are 0, which is Track.

2. In order to change to machine type to wheel, type 1 into fields beneath edit value column (X) .

3. Click download parameter icon (V) .

4. The 0s in ECU column (W) fields should be overwritten with 1s.

5. Reset is complete.