Pump Synchronization - Test and Adjust
Note: Perform the following 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. |
- Drive the machine to a smooth, horizontal surface.
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Illustration 1 g01358409 - Move propulsion lever (4) to the NEUTRAL position.
- Rotate speed dial (2) to the MINIMUM position.
- Move parking brake switch (1) to the ON position.
- Move travel mode switch (3) to the TRAVEL position.
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Illustration 2 g01358410 - Move screed lift switch (5) to the RAISE position. Completely lift the screed.
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Illustration 3 g01358412 - Engage screed lock mechanism (6) on both sides of the machine.
- Move screed lift switch (5) to the FLOAT position. Allow the tow arms to rest on screed locks (6a).
Note: The screed lift switch on the inactive operator station must also be in the FLOAT position in order to lower the screed.
- Rotate speed dial (2) to the MAXIMUM position.
- Move parking brake switch (1) to the OFF position.
Note: The parking brake switch on the inactive operator station must also be in the OFF position.
- Use propulsion lever (4) in order to control the speed and 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 (4) to the NEUTRAL position.
- Move parking brake switch (1) to the ON position.
- Move travel mode switch (3) to the PAVE position.
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Illustration 4 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) .Show/hide table
Illustration 5 g01359010 - Remove two screws (7). Remove access panel (8) from the bottom of the left 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, parallel with the track. - Move parking brake switch (1) to the OFF position.
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Illustration 6 g01359020 - If the gauge cluster is not displayed on the operator display screen, press home key (9) and then press escape key (10). Use the operator display in order to record the speed that the machine travels in the forward direction.
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Illustration 7 g01359121 - Simultaneously move the following switches into the FORWARD position:
- Left track propulsion override switch (11)
- Right track propulsion override switch (12)
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Illustration 8 g01359122 - A fault will appear on display. Press OK key (13) 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:- Left track propulsion override switch (11)
- Right track propulsion override switch (12).
- Move parking brake switch (1) to the ON position.
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Illustration 9 g01359125 (A) 6 m (20 ft) (Stringline 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 9.
- Establish a
6 m (20 ft) string line to the rear of the machine. The stringline should run from the center of one track and parallel with the track. - Move parking brake switch (1) to the OFF position.
- Simultaneously move the following switches into the REVERSE position:
- Left track propulsion override switch (11)
- Right track propulsion override switch (12)
- Use the gauge cluster in the operator display screen in order to record the speed that the machine travels in the reverse direction.
- A fault will appear on display. Press "OK" key (13) in order to acknowledge the fault. Return the display to the gauge cluster screen.
- After the machine has moved
6 m (20 ft) , simultaneously release the following switches:- Left track propulsion override switch (11)
- Right track propulsion override switch (12).
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Illustration 10 g01359128 - Move parking brake switch (1) to the ON position.
- Move throttle control switch (14) 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 (15) to the OFF position.
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Illustration 11 g01359132 (A) 6 m (20 ft) (Stringline 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 (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 7.0 m/min (23 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 turnAdjust left pump neutral screw clockwise one-eighth of a turn
Adjust right pump neutral screw counterclockwise one-eighth of a turnSpeed Forward 7.0 m/min (23 ft/min)
Less Than Speed ReverseAdjust left pump neutral screw counterclockwise one-eighth of a turn
Adjust right pump neutral screw counterclockwise one-eighth of a turnAdjust left pump neutral screw counterclockwise one-eighth of a turn Adjust right pump neutral screw counterclockwise one-eighth of a turn Speed Forward 7.0 m/min (23 ft/min)
Greater Than Speed ReverseAdjust left pump neutral screw clockwise one-eighth of a turn
Adjust right pump neutral screw clockwise one-eighth of a turnAdjust 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 45. If an adjustment is necessary, go to Step 38.
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Illustration 12 g01359146 - Open the pump compartment (16) which is on the right side of the machine.
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Illustration 13 g01359147 Right pump shown, left pump is identical (Except for orientation) - Loosen locknut (17) on the pump adjustment mechanism. Turn adjustment screw (18) as indicated 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) . Go back to Step 21. - Close the pump compartment door (16).
Note: The switch for the screed lift must be reset to the HOLD position before the machine will start.
- Move engine start switch (15) 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 (14) to the HIGH IDLE position. Hold the switch in this position for less than 1 second. The engine speed should increase to 2200 rpm. Go to Step 18.
- Replace propulsion override switch cover (8) and install screws (7).
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