CB44B Vibratory Asphalt Compactor Propel System Caterpillar

Piston Pump Neutral - Test and Adjust - Mechanical, Solid Drum

Usage:

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Diesel engine exhaust contains products of combustion which may cause personal injury.

Always start and operate the engine in a well ventilated area, and, if in an enclosed area, vent the exhaust to the outside.

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Personal injury can result from rotating and moving parts. Stay clear of all rotating and moving parts.
Never attempt adjustments while the machine is moving or the engine is running unless otherwise specified.
The machine must be parked on a level surface and the engine stopped.

Attach a "Do Not Operate" or similar warning tag to the start switch and controls before servicing, repairing, or making adjustments to the machine.

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Personal injury or death can result from sudden machine movement.
Sudden movement of the machine can cause injury to persons on or near the machine.

To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before operating the machine.

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Escaping fluid under pressure, even a pinhole size leak, can penetrate body tissue, causing serious injury, and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury.

Always use a board or cardboard when checking for a leak.

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Personal injury can result from hydraulic oil pressure and hot oil.
Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system.

Make sure all of the attachments have been lowered, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.

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Injury to personnel can result if they are not in the operator's view. Allow only essential personnel near the machine, and make sure the personnel are in the operator's view when testing, to prevent injury. Make sure checks are done in an open area.

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Hot parts or hot components can cause burns or personal injury. Do not allow hot parts or components to contact your skin. Use protective clothing or protective equipment to protect your skin.

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NOTICE

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide", for tools and supplies suitable to collect and contain fluids in Caterpillar machines. Dispose of all fluids according to local regulations and mandates.

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Table 1
Required Tools
Tools	Part Number	Description	Qty
A⁽¹⁾	198-4234	Digital Indicator	1
B⁽¹⁾	198-4236	Adapter Cable As	4
C⁽¹⁾	198-4237	Pressure Sensor Gp 0-3500 kPa (0-500 psi)	2
D⁽¹⁾	198-4239	Pressure Sensor Gp 0-41000 kPa (0-6000 psi)	2
E	348-5430	Multi-Tool Gp	1
F	110-6349	Fitting As	2
G	6V-9830	Cap As	2
H	6V-9509	Plug	2
H	6V-8398	O-Ring Seal	2
J	177-7860	Hose As	1
J	6V-4143	Quick Connect Coupler	2
K	N/A	Laptop Computer With Plus+1^tm Software	1
L⁽²⁾	317-7485	Communication Adapter	1
M⁽²⁾	327-8981	Cable As	1
N⁽²⁾	370-4617	Cable As	1

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⁽¹⁾	Tool (A), Tool (B), Tool (C), and Tool (D) are part of the 198-4240 Digital Pressure Indicator Gp.
⁽²⁾	Tool (L), Tool (M), and Tool (N) are part of the 317-7484 Communication Adapter Gp.

Note: In order to perform this test and adjust, the brakes must be disconnected or the machine must be placed on jack stands.

Drive the machine to a smooth, horizontal surface.
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Illustration 1 g03225798
Move propel lever (1) to the NEUTRAL position.
Move parking brake switch (2) to the ON position.
Use throttle control switch (3) in order to operate the engine in ECO mode or in low idle.
Note: Two things indicate when the engine is in ECO mode. First, "ECO" will appear on the display. Second, the second LED next to throttle control switch (3) will be illuminated. Two things indicate when the engine is at low idle. First, "Low Idle" will appear on the display. Second, the first LED next to the throttle control switch will be illuminated.
Move engine start switch (4) to the OFF position.
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Illustration 2 g03225799
Unlock latch (5) and open engine compartment door (6) on the right side of the machine.
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Illustration 3 g03225802
Remove ten bolts (7) and remove side panel (8) on the right side of the machine.
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Illustration 4 g03225818
Disconnect brake supply hose assembly (9) at both propel motors. Use Tool (G) to cap the port. Use Tool (H) to plug the hose.
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Illustration 5 g03225819
Mark the electrical connections. Disconnect solenoid electrical connections (10).
Assemble the tooling. Install one Tool (D) on Tool (B). Make two sets of tooling.
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Illustration 6 g03225822
Connect one Tool (D) to port "Mb" (11) on the propel pump.
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Illustration 7 g03225823
Connect other Tool (D) to port "Ma" (12) on the bottom of the propel pump.
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Illustration 8 g03225826
Remove the plug from port "M5" (13). Install one Tool (F) in port "M5" (13). Tighten Tool (F) to a torque of 12 N·m (9 lb·ft). Connect one end of Tool (J) to Tool (F).
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Illustration 9 g03225836
Remove the plug from port " M4" (14). Install one Tool (F) in port "M4" (14). Tighten Tool (F) to a torque of 12 N·m (9 lb·ft). Connect other end of Tool (J) to Tool (F).
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Illustration 10 g03225837
Connect Tool (M) and Tool (N) to Tool (L). Connect Tool (M) to diagnostic connector (15). Connect Tool (N) to USB port on Tool (K).
Move engine start switch (4) to the START position. Release the switch when the engine starts.
Use throttle control switch (3) in order to operate the engine in ECO mode or in low idle.
Note: Two things indicate when the engine is in ECO mode. First, "ECO" will appear on the display. Second, the second LED next to throttle control switch (3) will be illuminated. Two things indicate when the engine is at low idle. First, "Low Idle" will appear on the display. Second, the first LED next to the throttle control switch will be illuminated.
Operate the engine at low idle for a few minutes. Use throttle control switch (3) in order to operate the engine in high idle.
Note: Two things indicate when the engine is at high idle. First, "High Idle" will appear on the display. Second, all three LED's next to throttle control switch (3) will be illuminated.
Monitor the hydraulic oil temperature with Tool (E). Operate the machine until the oil temperature reaches 43 ± 5.6 °C (110 ± 10 °F).
Use throttle control switch (3) in order to operate the engine in ECO mode or in low idle.
Note: Two things indicate when the engine is in ECO mode. First, "ECO" will appear on the display. Second, the second LED next to throttle control switch (3) will be illuminated. Two things indicate when the engine is at low idle. First, "Low Idle" will appear on the display. Second, the first LED next to the throttle control switch will be illuminated.
Move parking brake switch (2) to the OFF position.
Note: First time users need to perform the tasks in the Communication and Connections Wizard. This wizard allows the Windows® operating system to recognize the USB device. Follow the on screen instructions.
Launch the Plus+1^TM program on the computer.
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Illustration 11 g03225856
Click on "Status" button (16).
Check "Active Codes" (17). Clear any open "Active Codes".
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Illustration 12 g03225858
Click on "Hydraulics" icon (18).
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Illustration 13 g03225860
Click on "Piston Pump Neutral Test" (19).
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Illustration 14 g03225862
Click on "Enable" icon (20).
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Illustration 15 g03225863
When "Piston Pump Neutral Test" (19) is in "Enabled" mode (21), the Plus+1^TM program is launched.
Read differential pressure on Tool (A). The pressure differential should be less than 150 kPa (22 psi). If the differential pressure is less than 150 kPa (22 psi), go to Step 55. If the pressure is not within 150 kPa (22 psi), go to Step 30.
Move parking brake switch (2) to the ON position.
Move engine start switch (4) to the OFF position.
Disconnect Tool (J) from Tool (F) in port "M5" (10). Disconnect other end of Tool (J) from Tool (F) in port "M4" (11).
Assemble the tooling. Connect one Tool (B) to each Tool (D). Make two sets of Tool (D) and Tool (B). Connect both sets of Tool (D) to Tool (A).
Connect one Tool (D) to Tool (F) in port "M5" (13).
Connect other Tool (D) to Tool (F) in port "M4" (14).
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Illustration 16 g03225865
Remove lock-screws (22) and lock-plates (23) from servo cylinder cap (24) for the "M5" servo cylinder.
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Illustration 17 g03225876
Remove lock-screws (26) and lock-plates (27) from servo cylinder cap (25) for the "M4" servo cylinder.
Using a 3/4" deep socket, unthread servo cylinder cap (24) and servo cylinder cap (25) two to three turns. This action will ensure that the servo cylinder caps are not in contact with the servo piston.
Move engine start switch (4) to the START position. Release the switch when the engine starts.
Use throttle control switch (3) in order to operate the engine in ECO mode or in low idle.
Note: Two things indicate when the engine is in ECO mode. First, "ECO" will appear on the display. Second, the second LED next to throttle control switch (3) will be illuminated. Two things indicate when the engine is at low idle. First, "Low Idle" will appear on the display. Second, the first LED next to the throttle control switch will be illuminated.
Move parking brake switch (2) to the OFF position.
Launch the Plus+1^TM program on the computer. Enable the "Piston Pump Neutral Test".
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Illustration 18 g03225877

Note: A small movement of the adjustment mechanism is all that will be required. Larger movements may cause machine movement.
Loosen locknut (28) and rotate adjustment screw (29). Note the pressure at port "M4" (14) and port "M5" (13). Rotate adjustment screw (29) until the servo pressure at port "M4" is 95 - 200 kPa (14 - 29 psi) greater than port "M5".
The system pressure at port "Ma" and port "Mb" should indicate displacement. Clockwise rotation of adjustment screw (29) will increase pressure at port "Ma". Counter clockwise rotation of adjustment screw (29) will increase pressure at port "Mb". This situation indicates the servo piston is in contact with the servo cylinder cap on the "M5" side of the pump.
Slowly turn servo cylinder cap (24), on the "M5" side of the pump, in until the system pressure differential starts to decrease. Maintain servo pressure 95 - 200 kPa (14 - 29 psi) higher on port "M4" than port "M5" during this step.
Continue turning servo cylinder cap (24), on the "M5" side of the pump, in until the system pressure differential between port "Ma" and port "Mb" is less than 150 kPa (22 psi). This action will set the servo and swashplate to mechanical neutral on the "M5" side.
Replace lock-screws (22) and lock-plates (23) on servo cylinder cap (24). Tighten lock-screws (22) to a torque of 14.5 N·m (11 lb·ft).
Turn adjustment screw (29) in the opposite direction in order to stroke the pump in the opposite direction. Rotate adjustment screw (29) until the servo pressure at port "M5" is 95 - 200 kPa (14 - 29 psi) greater than port "M4".
Slowly turn cylinder cap (25), on the "M4" side of the pump, in until the system pressure differential starts to decrease. Maintain "M5" servo pressure 95 - 200 kPa (14 - 29 psi) higher than "M4" servo pressure during this step.
Continue turning cylinder cap (25), on the "M4" side of the pump, in until the system pressure differential between port "Ma" and port "Mb" is less than 150 kPa (22 psi). This action will set the servo and swashplate to mechanical neutral on the "M4" side.
Replace lock-screws (26) and lock-plate (27) on "M4" servo cylinder cap (25). Tighten lock-screws (26) to a torque of 14.5 N·m (11 lb·ft).
The mechanical neutral is now set on the propel pump.
Turn adjustment screw (29) until pressures at"M4" and "M5" are equal in order to set the electric neutral adjustment.
Hold adjustment screw (29) in place and tighten locknut (28). Tighten locknut (28) to a torque of 10 N·m (7 lb·ft).
Move parking brake switch (2) to the ON position.
Move engine start switch (4) to the OFF position.
Remove the tooling from port "Mb" (11) and port "Ma" (12) in the propel pump.
Remove tooling from port "M4" and port "M5". Replace the plugs. Tighten the plugs to a torque of 12 N·m (9 lb·ft).
Connect solenoid electrical connections (10).
Remove tooling from diagnostic connector (15).
Remove Tool (H) from brake supply hose assembly (9) at the drum propel motors. Remove Tool (G) from the brake inlet port at the drum propel motors. Connect brake supply hose (9) to the brake inlet ports on the propel motors.
Position side panel (8) and install ten bolts (7).
Close engine compartment door (6) on the right side of machine and secure latch (5).