AP300F Asphalt Paver Propel System Caterpillar

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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 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. Personal injury can result from rotating and moving parts. Moving fan blades and moving parts will throw or cut any object or tool that falls or is pushed into them. Make sure no one is working on, underneath or close to an engine that is running. Make sure the area is free of personnel.

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Personal injury can result from rotating and moving parts. Moving fan blades and moving parts will throw or cut any object or tool that falls or is pushed into them. Make sure no one is working on, underneath or close to an engine that is running. Make sure the area is free of personnel.

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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.

Specifications

Introduction

The right propel pump is equipped with one pressure override relief (POR) valve. This valve destrokes the pump when the pressure reaches the setting of the valve. The right propel pump is also equipped with two combination relief valves. Each circuit of the hydrostatic loop contains one combination relief valve. The combination relief valves are set to open at a higher pressure than the POR valve.

Low propel pressure can indicate a faulty combination relief valve or a faulty POR valve. Perform the following test if a combination relief valve has been tested or replaced. Also perform this procedure if the machine is exhibiting any of the following conditions:

• The machine will not reach full speed.

• The machine will not operate in one direction.

• The hydraulic oil is overheating.

Required Tools

Illustration 1	g02571852

1. Connect one Tool (A2) to Tool (A3).

2. Connect each Tool (A3) to Tool (A1).

Test Preparation

1. Drive the machine to a smooth, horizontal surface.

   Note: The machine will move during this test. Make sure that the test area has adequate space to perform this procedure.

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   Illustration 2	g03890163

2. Move propel lever (4) to the NEUTRAL position.

3. Press parking brake switch (5) to change the status of the parking brake to "engaged". When the parking brake status is "engaged", an LED next to the parking brake switch will be illuminated.

4. Use travel mode switch (3) to select the pave mode. When the travel mode is set to pave, an LED next to pave symbol (2) will be illuminated.

   Note: The machine must be in pave mode to operate the screed lift system, hopper system, tow point system, and auger lift system.

5. Press and hold screed raise switch (1). Release the switch when the screed is raised fully.
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   Illustration 3	g03890192

6. Engage screed lock lever (6) on each side of the machine.
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   Illustration 4	g03890385

7. Use screed float switch (7) to place the screed in the FLOAT position. When the screed is in the FLOAT position, an LED next to the screed float switch will illuminate. Allow the tow arms to rest on the screed lock lever.
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   Illustration 5	g03891412

8. If necessary, press left hopper raise switch (8) and right hopper raise switch (9) to raise the hoppers off the hopper service locks.
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   Illustration 6	g03891434

9. If necessary, retract hopper service lock mechanism (10) on each side of the machine.
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   Illustration 7	g03891437

10. Use left hopper lower switch (11) and right hopper lower switch (12) to lower the hoppers.
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    Illustration 8	g06003320

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    Illustration 9	g06003351

11. Press rpm decrease switch (14) once to operate the engine in low idle.

12. Use travel mode switch (3) to select the travel mode. When the travel mode is set to travel, an LED next to travel symbol (13) will be illuminated.

13. Rotate speed dial (15) until target speed (16) is 2 km/hr (1.2 mph).
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    Illustration 10	g06003357

14. Examine the display. If "Regen Conditions Not Met" warning (17) is shown and the banner is yellow, allow the engine to operate until the regeneration cycle is complete. The cycle may require up to 1 hour to complete. If the warning banner is red, use Cat^® ET to complete a regeneration cycle as soon as possible. If no engine regeneration warning is shown, go to the next step.
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    Illustration 11	g06003362

15. Press and hold push to start switch (18). Release the switch when the engine stops.
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    Illustration 12	g06003365

16. Move machine power switch (19) to the OFF position.
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    Illustration 13	g06003376

17. Open pump compartment door (20).
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    Illustration 14	g06003380

18. Disconnect balance line (21) from port "MA".

19. Use Tool (C) to plug the hose, and use Tool (B) to cap the port.
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    Illustration 15	g06003392

20. Disconnect balance line (22) from port "MB".

21. Use Tool (C) to plug the hose, and use Tool (B) to cap the port.
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    Illustration 16	g06003600

22. Connect one Tool (A2) to forward pressure tap (24) in port "MB".

23. Connect one Tool (A2) to reverse pressure tap (23) in port "MA".
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    Illustration 17	g06003424

24. Open compartment door (25).
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    Illustration 18	g06003430

25. Loosen the retaining screw on brake solenoid connector (26). Disconnect the brake solenoid connector from the brake solenoid. Make sure the seal at the base of the solenoid connector remains on the connector.

Test Procedure

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Illustration 19	g06003441

1. Move machine power switch (19) into the ON position. After the home screen is shown on display (27) press and hold push to start switch (18). Release the switch when the engine starts.
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   Illustration 20	g06003487

2. Actuate screen unlock switch (28) to enable the touch screen on the display.

   Note: When the display is enabled, an LED next to the screen unlock switch is illuminated.

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   Illustration 21	g06003490

3. Tap status icon (29) to enter the status screen.
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   Illustration 22	g06003492

4. Operate the engine at low idle for a few minutes. Press rpm increase switch (30) once to operate the engine in high idle.
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   Illustration 23	g06003504

5. Monitor the hydraulic oil temperature (31) on display (27). Operate the machine until the oil temperature reaches a minimum of 45 ± 10 °C (113 ± 18 °F).

6. Press parking brake switch (5) to change the status of the parking brake to "disengaged".

   Note: If the machine moves in the next step, immediately return propel lever (4) to the NEUTRAL position. Troubleshoot the parking brake system before this test is resumed.

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   Illustration 24	g06003512

7. Squeeze trigger (32), and move propel lever (4) slowly into the forward range. Allow the pressure to stabilize. Record the pressure at forward pressure tap (24) in port "MB". The pressure should be 42 500 ± 1500 kPa (6170 ± 217 psi). Move the propel lever to the NEUTRAL position.

   Note: If the machine moves in the next step, immediately return propel lever (4) to the NEUTRAL position. Troubleshoot the parking brake system before this test is resumed.

8. Squeeze trigger (32), and move propel lever (4) slowly into the reverse range. Allow the pressure to stabilize. Record the pressure at reverse pressure tap (23) in port "MA". The pressure should be 42 500 ± 1500 kPa (6170 ± 217 psi). Move the propel lever to the NEUTRAL position.

9. Press parking brake switch (5) to change the status of the parking brake to "engaged". When the parking brake status is "engaged", an LED next to the parking brake switch will be illuminated.

10. Press rpm decrease switch (14) once to operate the engine in low idle.

    Note: If necessary. perform a regeneration cycle before the engine is stopped.

11. Press and hold push to start switch (18). Release the switch when the engine stops.

12. Move machine power switch (19) to the OFF position.

13. If the pressure recorded in Step 7 and/or in Step 8 is outside the specified range, perform "Adjustment Procedure"adjustment procedure. If the pressure readings were inside the specified range, go to the next step.

14. Remove Tool (A2) from forward pressure tap (24) in port "MB".

15. Remove Tool (A2) from reverse pressure tap (23) in port "MA".

16. Remove Tool (C) and Tool (B). Connect balance line (21) to port "MA".

17. Remove Tool (C) and Tool (B). Connect balance line (22) to port "MB".

18. Install brake solenoid connector (26) and the seal on the brake solenoid. Tighten the retaining screw.

19. Close compartment door (25).

20. Close pump compartment door (20), and secure the door with the latches.

Adjustment Procedure

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Illustration 25	g06003645

1. Remove cap (33) from the POR valve.
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   Illustration 26	g06016542

2. Loosen locknut (34). Turn adjustment screw (35) clockwise to increase POR pressure. Turn the adjustment screw counterclockwise to decrease POR pressure.

   Note: One-quarter turn of adjustment screw (34) results in a pressure change of approximately 8270 kPa (1200 psi).

3. Hold adjustment screw (35). Tighten locknut (34).

4. Perform "Test Procedure".