AP600D and BG600D Asphalt Pavers Propel System Caterpillar

Rotary Position Sensor (Brake Pedal) - Test and Adjust

Usage:

Note: The machine is equipped with one position sensor for the left brake pedal and one position sensor for the right brake pedal. Both sensors should be tested. This test procedure is for the left sensor.

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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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Table 1
Required Tools
Tool	Part Number	Description	Qty
A	146-4080	Digital Multimeter Gp	1
B	7X-1710	Multimeter Probe	1

Drive the machine to a smooth, horizontal surface.

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Illustration 1	g01473996

Move propel lever (3) to the NEUTRAL position.

Rotate speed dial (2) to the MINIMUM position.

Move parking brake switch (1) to the ON position.

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Illustration 2	g01473997

Move screed lift switch (4) to the FLOAT position. Lower the screed to the ground.
Note: The screed lift switch on the inactive instrument panel must also be in the FLOAT position in order to lower the screed.

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Illustration 3	g01473999

Move screed lift switch (6) to the HOLD position.

Move throttle control switch (5) 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 (6) to the OFF position.

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Illustration 4	g01476779

Lift platform lock (7) . Rotate the operator platform outboard in order to provide access to the connectors of the operator control unit.

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Illustration 5	g01476784

Remove the cover from connector "J1" (8) . Remove the cover from connector "J2" (9) . Connector "J1" is the front connector and connector "J2" is the rear connector.
Note: On the right operator platform, connector "J1" is the rear connector and connector "J2" is the front connector.

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Illustration 6	g01476790
Locations for Connector "J1" and Connector "J2"

Insert the black spoon of Tool (B) into pin "13" (200-BK wire) of connector "J1" (8) . Connect the black spoon to Tool (A) .

Insert the red spoon from Tool (B) into pin "16" (370-BU wire) of connector "J2" (9) . Connect the red spoon to Tool (A) .

Set Tool (A) to read "duty cycle".

Move engine start switch (6) to the ON position. Do not start the engine.

The value on Tool (A) should be 78 ± 5 percent. If the value is outside the specified range, go to Step 21.

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Illustration 7	g01476792

Slowly depress brake pedal (10) and steadily depress brake pedal (10) against the stop. Observe reading on Tool (A) . The value should steadily decrease as the pedal is moved downward. The value should not stop decreasing until the pedal reaches the stop. When the pedal is against the stop, the value on Tool (A) should be 10 ± 5 percent.

Slowly release brake pedal (10) and steadily release brake pedal (10) . Observe reading on Tool (A) . The value should steadily increase as the pedal is moved downward. The value should not stop increasing until the pedal reaches the stop.

Move engine start switch (6) to the OFF position.

Remove the tooling. Replace the cover on connector "J1" (8) . Replace the cover on connector "J2" (9) . Use wire ties in order to secure the cover to the harness at each connector.

If readings on Tool (A) are within the specified ranges, the sensor is operating correctly. Go to the next step if the readings on Tool (A) do not steadily change through the full range of brake pedal (10) , and/or the readings are not within the specified range.