AP655D Asphalt Paver Propel System Caterpillar

Pump Synchronization - Test and Adjust - Steel Track

Usage:

Note: Perform this procedure if the machine drifts to one side during straight travel operation.

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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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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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To prevent injury or death, never work under a machine while a test is being performed.

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Illustration 1	g01423711

Move engine start switch (2) to the START position. Release the engine start switch when the engine starts.

Operate the engine at low idle for a few minutes.

Move throttle control switch (1) to the HIGH IDLE position. Hold the switch in this position for less than 1 second. The engine speed should increase to 2200 rpm.

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Illustration 2	g01423712

Move screed lift switch (3) to the RAISE position. Completely lift the screed.

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Illustration 3	g01423714

Engage screed lock mechanism (4) on both sides of the machine.

Move screed lift switch (3) to the FLOAT position. Allow the tow arms to rest on screed locks (4) .

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Illustration 4	g01423715

Rotate speed dial (5) to the MAXIMUM position.

Move parking brake switch (8) to the OFF position.

Use propulsion lever (6) in order to control the speed, and use this lever in order to control the direction of travel (forward or reverse).

Drive the machine to a clear area that is free from personnel and equipment. The area must be clear within a minimum radius of the machine of 30.5 m (100 ft). The area must be level. The area must have a hard, consistent surface.

Move propulsion lever (6) to the NEUTRAL position.

Move parking brake switch (8) to the ON position.

Move propulsion mode switch (7) to the PAVE position.

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Illustration 5	g01358848

Monitor the hydraulic oil temperature on the operator display. Operate the machine until the oil temperature reaches 43 ± 5.6 °C (110 ± 10 °F).

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Illustration 6	g01423717

Remove two screws (9). Remove access panel (10) from the bottom of the instrument panel.

Establish a 6 m (20 ft) string line in front of the machine. The string line should run from the center of one track and the string line should be parallel with the track.

Move parking brake switch (8) to the OFF position.

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Illustration 7	g01423719

If the gauge cluster is not displayed on the operator display, press home key (12). Then press escape key (11). Use the operator display in order to record the speed that the machine travels in the forward direction.

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Illustration 8	g01423720

Simultaneously move these switches into the FORWARD position:
- Propulsion override switch (13) for the left track
- Propulsion override switch (14) for the right track

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Illustration 9	g01423721

A fault will appear on the display. Press OK key (15) in order to acknowledge the fault and return the display to the gauge cluster screen.

After the machine has moved 6 m (20 ft), simultaneously release the following switches:
- Propulsion override switch (13) for the left track
- Propulsion override switch (14) for the right track

Move parking brake switch (8) to the ON position.

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Illustration 10	g01359125
(A) 6 m (20 ft) string line distance (B) 127 mm (5 in) allowable drift to left (C) 127 mm (5 in) allowable drift to right

Measure the distance that the machine drifts. The machine may drift to left (B) or the machine may drift to right (C). The drift cannot exceed the amount that is specified in Illustration 10.

Establish a 6 m (20 ft) string line to the rear of the machine. The string line should run from the center of one track and the string line should be parallel with the track.

Move parking brake switch (8) to the OFF position.

Simultaneously move these switches into the REVERSE position:
- Propulsion override switch (13) for the left track
- Propulsion override switch (14) for the right track

Use the gauge cluster that is in the operator display in order to record the speed at which the machine travels in the reverse direction.

A fault will appear on the display. Press OK key (15) in order to acknowledge the fault and return the display to the gauge cluster screen.

After the machine has moved 6 m (20 ft), simultaneously release the following switches:
- Propulsion override switch (13) for the left track
- Propulsion override switch (14) for the right track

Move parking brake switch (8) to the ON position.

Move throttle control switch (1) to the LOW IDLE position. Hold the switch in this position for less than 1 second.

After the engine reaches low idle, move engine start switch (2) to the OFF position.

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Illustration 11	g01359132
(D) 6 m (20 ft) string line distance (E) 1016 mm (40 in) allowable drift to left (F) 1016 mm (40 in) allowable drift to right

Measure the distance that the machine drifts. The machine may drift to left (E) or the machine may drift to right (F). The drift cannot exceed the amount that is specified in Illustration 11.

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Table 1
Pump Neutral Adjustment Chart
Speed Condition	Travels Straight Forward Using Propulsion Override Switches.	Excessive Drift to Left in Forward Using Propulsion Override Switches	Excessive Drift to Right in Forward Using Propulsion Override Switches
Speed Forward and Speed Reverse Within 3 m/min (9.8 ft/min).	No adjustment necessary	Adjust left pump neutral screw counterclockwise one-eighth of a turn Adjust right pump neutral screw clockwise one-eighth of a turn	Adjust left pump neutral screw clockwise one-eighth of a turn Adjust right pump neutral screw counterclockwise one-eighth of a turn
Speed Forward 3 m/min (9.8 ft/min) Less Than Speed Reverse	Adjust left pump neutral screw counterclockwise one-eighth of a turn Adjust right pump neutral screw counterclockwise one-eighth of a turn	Adjust left pump neutral screw counterclockwise one-eighth of a turn	Adjust right pump neutral screw counterclockwise one-eighth of a turn
Speed Forward 3 m/min (9.8 ft/min) Greater Than Speed Reverse	Adjust left pump neutral screw clockwise one-eighth of a turn Adjust right pump neutral screw clockwise one-eighth of a turn	Adjust right pump neutral screw clockwise one-eighth of a turn	Adjust left pump neutral screw clockwise one-eighth of a turn

Use the information in Table 1 in order to determine if an adjustment should be made.

If no adjustment is necessary, go to Step 44. If an adjustment is necessary, go to Step 36.

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Illustration 12	g01423723

Open pump compartment (16), which is on the right side of the machine.

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Illustration 13	g01423724
Right pump shown, left pump is identical (Except for orientation)

Loosen locknut (17) on the pump adjustment mechanism. Turn adjustment screw (18) as shown in Table 1. It may be necessary to adjust both pumps.

Hold adjustment screw (18), and tighten locknut (17) to 7 N·m (62 lb in).

Close pump compartment door (16) .

Move engine start switch (2) to the START position. Release the engine start switch when the engine starts.

Operate the engine at low idle for a few minutes.

Move throttle control switch (1) to the HIGH IDLE position. Hold the switch in this position for less than 1 second. The engine speed should increase to 2200 rpm.