AP-1055D and BG-2455D Asphalt Pavers Propel System Caterpillar

Pump Synchronization - Test and Adjust

Usage:

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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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Table 1
Required Tools
Tool	Part Number	Description	Qty
A	4C-6500	Digital Thermometer	1

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Illustration 1	g01163366

Move key switch (1) to the ON position.

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Illustration 2	g01163377

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

Move throttle control switch (4) to the HIGH IDLE position. Hold the switch in this position for less than 1 second. The engine speed should increase to 2310 rpm.

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

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Illustration 3	g01163391

Engage screed lock (5) on both sides of the machine.

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Illustration 4	g01163422

Rotate speed dial (7) 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 travel mode switch (9) to the PAVE position.

Monitor the hydraulic oil temperature with Tool (A). Operate the machine until the oil temperature reaches 43° ± 5.6°C (110° ± 10°F).

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Illustration 5	g01163474

Open the access panel of the center console.

Locate propulsion override connector (10) .

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Illustration 6	g01163481

Remove four screws (11). Remove access panel (12) from the back of the left steering column.

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Illustration 7	g01163486

Plug propulsion override connector (10) into receptacle (13) .

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 run parallel with the track.

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

Simultaneously move these switches into the FORWARD position:
- propulsion override switch (14) for the left track
- propulsion override switch (15) for the right track.

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Illustration 8	g01163501

Use foot per minute gauge (16) in order to record the speed that the machine travels in the forward direction.

After the machine has moved 6 m (20 ft), simultaneously release the following switches:
- propulsion override switch (14) for the left track
- propulsion override switch (15) for the right track.

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

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Illustration 9	g01163552
(A) 6 m (20 ft) (Stringline distance) (B) 127 mm (5 inch) (Allowable drift to the left) (C) 127 mm (5 inch) (Allowable drift to the right)

Measure the distance of the machine drift. The machine may drift to the left (B) or the machine may drift to the right (C). The drift cannot exceed the amount that is specified in illustration 9.

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 run parallel with the track.

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

Simultaneously move these switches into the REVERSE position:
- propulsion override switch (14) for the left track
- propulsion override switch (15) for the right track.

Use foot per minute gauge (16) to record the speed of the machine travels traveling in the reverse direction.

After the machine has moved 6 m (20 ft), simultaneously release the following switches:
- propulsion override switch (14) for the left track
- propulsion override switch (15) for the right track.

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

Move throttle control switch (4) 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.

Move key switch (1) to the OFF position.

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Illustration 10	g01163650
(D) 6 m (20 ft) travel distance. (E) 1016 mm (40 inch) Allowable drift to left. (F) 1016 mm (40 inch) Allowable drift to right.

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

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Table 2
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 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 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 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