CB7 and CB8 Vibratory Asphalt Compactor Machine Systems Caterpillar

Piston Pump Neutral (Vibratory) - Test and Adjust - Mechanical, Solid Drum

Usage:

CB7 AT5

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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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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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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
Tool	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 to 3500 kPa (500 psi)	2
D⁽¹⁾	198-4239	Pressure Sensor Gp 0 to 41000 kPa (6000 psi)	2
E	110-6349	Fitting As	2
F	177-7860	Hose As	1
F	6V-4143	Quick Connect Coupler	2
G	N/A	Laptop Computer With Plus+1^TM Software	1
H⁽²⁾	317-7485	Communication Adapter	1
J⁽²⁾	457-6114	Cable As	1
K⁽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 (H), Tool (J), and Tool (K) are part of the 466-6258 Communication Adapter Gp.

Drive the machine to a smooth, horizontal surface.
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Illustration 1 g06160408
Move propel lever (1) to the NEUTRAL position.
Move parking brake switch (2) to the ON position.
Place the engine in ECO mode or low idle.
1. Select "Main Menu" (3) on the machine display.
2. Select "Machine Setup" (4).
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  Illustration 3 g06148261
3. Select "Engine Spd Sw" (5).
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  Illustration 4 g06148286
4. Select "ECO" (6) or "Low" (7).
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Illustration 5 g06160422
Move engine start switch (8) to the OFF position.
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Illustration 6 g06160385
Unlock latch (9) and open engine compartment door (10) on the right side of the machine.
Assemble the tooling. Connect Tool (D) to Tool (B). Make two sets of Tool (D) and Tool (B).
Connect both sets of Tool (B) to Tool (A).
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Illustration 7 g06161928
Connect one Tool (D) to port "Ma" (11) on the machine valve.
Connect other Tool (D) to port "Mb" (12) of the machine valve.
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Illustration 8 g06162120
Mark the solenoid electrical connections. Disconnect solenoid electrical connections (13).
Assemble Tool (F).
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Illustration 9 g06162127
Remove the plug from port "M4" (14). Install one Tool (E) in port "M4". Tighten Tool (E) to a torque of 12 N·m (9 lb·ft). Connect one end of Tool (F) to Tool (E) in port "M4".
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Illustration 10 g06162131
Remove the plug from port "M5" (15). Install one Tool (E) in port "M5". Tighten Tool (E) to a torque of 12 N·m (9 lb·ft). Connect other end of Tool (F) to Tool (E) in port "M5".
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Illustration 11 g06162132
Connect Tool (J) and Tool (K) to Tool (H). Connect Tool (J) to diagnostic connector (16). Connect Tool (K) to USB port on Tool (G).
Move engine start switch (8) to the START position. Release the switch when the engine starts.
Place the engine in high idle.
Operate the hydraulic system until the oil temperature reaches the test temperature of 45 °C (113 °F).
Place the engine in ECO mode or in low idle.
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 12 g06150267
Click "Status" button (17).
Check the "Active Codes". Clear any open "Active Codes".
Click "Machine Control" (18).
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Illustration 13 g06150283
Click "Hydraulics" icon (19).
Click "Piston Pump Neutral Test" (20).
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Illustration 14 g06150287
Click "Piston Pump Neutral Test" (21).
Click "Enable" icon (22).
When "Piston Pump Neutral Test" (21) is in the "Enabled" mode, the Plus+1^TM program is launched.
Record pressure differential on Tool (A). The pressure differential should be less than 150 kPa (22 psi). If the pressure differential is within 150 kPa (22 psi), go to Step 56. If the pressure differential is not equal, go to Step 31.
Move parking brake switch (2) to the ON position.
Move engine start switch (8) to the OFF position.
Disconnect Tool (F) from Tool (E) in port "M4" (14) and port "M5" (15).
Assemble the tooling. Connect Tool (C) to Tool (B). Make two sets of Tool (C) and Tool (B).
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Illustration 15 g06162127
Connect Tool (C) to Tool (E) in port "M4" (14). Connect Tool (B) to Tool (A).
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Illustration 16 g06162131
Connect other Tool (C) to Tool (E) in port "M5" (15). Connect Tool (B) to Tool (A).
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Illustration 17 g06162843
Remove lock screws (25) and lock plate (24) from "M4" servo cylinder cap (23).
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Illustration 18 g03159187
Remove lock screws (28) and lock plate (26) from "M5" servo cylinder cap (27).
Using a 3/4" deep socket, unthread servo cylinder cap (23) and servo cylinder cap (27) 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 (8) to the START position. Release the switch when the engine starts.
Place the engine in ECO mode or in low idle.
Move parking brake switch (2) to the OFF position.
Repeat Step 21 through Step 29 to launch the Plus+1^TM program on the computer.
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Illustration 19 g03159191
Loosen lock nut (29) and rotate adjustment screw (30). Note the pressure at port "M4" and port "M5". Rotate adjustment screw (30) until the servo pressure at port "M4" is 95 kPa (14 psi) to 200 kPa (29 psi) greater than port "M5".
The system pressure at port "Ma" and port "Mb" should indicate displacement. Clockwise rotation of adjustment screw (30) will increase pressure at port "Ma". Counterclockwise rotation of adjustment screw (30) will increase pressure at port "Mb". This action indicates that the servo piston is in contact with the servo cylinder cap on the "M5" side of the pump.
Slowly turn servo cylinder cap (27), on the "M5" side of the pump, in until the system pressure differential starts to decrease. Maintain "M4" servo pressure 95 kPa (14 psi) to 200 kPa (29 psi) higher than "M5" servo pressure during this step.
Continue to turn cylinder cap (27), 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 (28) and lock plate (26) on the "M5" servo cylinder cap (19). Tighten lock screws to a torque of 14.5 N·m (11 lb·ft).
Rotate adjustment screw (30). Note the pressure at port "M4" and port "M5". Rotate adjustment screw (30) until the servo pressure at port "M5" is 95 kPa (14 psi) to 200 kPa (29 psi) greater than port "M4".
The system pressure at port "Ma" and port "Mb" should indicate displacement. Clockwise rotation of adjustment screw (30) will increase pressure at port "Ma". Counterclockwise rotation of adjustment screw (30) will increase pressure at port "Mb". This action indicates that the servo piston is in contact with the servo cylinder cap on the "M4" side of the pump.
Slowly turn servo cylinder cap (23), on the M4 side of the pump, in until the system pressure differential starts to decrease. Maintain "M5" servo pressure 95 kPa (14 psi) to 200 kPa (29 psi) higher than "M4" servo pressure during this step.
Continue to turn servo cylinder cap (23), 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 (25) and lock plate (16) on the "M4" servo cylinder cap (23). Tighten lock screws to a torque of 14.5 N·m (11 lb·ft).
Turn adjustment screw (30) until pressures at"M4" and "M5" are equal.
Hold adjustment screw (30) in place and tighten lock nut (21). Tighten lock nut to a torque of 10 N·m (7 lb·ft).
Move parking brake switch (2) to the ON position.
Move engine start switch (8) to the OFF position.
Remove tooling from diagnostic connector (16).
Remove tooling from port "Ma" (11) and port "Mb" (12) on the machine valve.
Remove the tooling from port "M4" (14) and from port "M5" (15). Install plugs. Tighten plugs to a torque of 12 N·m (9 lb·ft).
Connect solenoid electrical connectors (13).
Close engine compartment door (10) on the right side of machine and secure latch (9).