SPECIAL AR 3157169 - Caterpillar

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.
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.
Illustration 1 g02523276
Move propel lever (1) to the NEUTRAL position.
Rotate speed dial (4) to the MINIMUM position.
Move parking brake switch (2) to the ON position.
Move propel mode switch (3) to the PAVE position.Note: The machine must be in PAVE mode in order to operate the screed lift system.
Illustration 2 g02523278
Move screed lift switch (5) to the FLOAT position. Allow the screed to lower to the ground.Note: The screed lift switch on both instrument panels must be in the FLOAT position in order for the screed to lower.
After the screed rests on the ground, move screed lift switch (5) to the HOLD position.
Illustration 3 g02523296
Move throttle control switch (6) to the LOW IDLE position. Hold the switch in this position for less than 1 second.
Illustration 4 g02523298
After the engine reaches low idle, move engine start switch (7) to the OFF position.
Illustration 5 g02523476
Left operator platform shown.
Lift platform lock (8). Rotate the operator platform outboard in order to access the connectors of the operator control unit.Note: If the left sensor is being tested, rotate the left operator platform. If the right sensor is being tested, rotate the right operator platform.
Illustration 6 g02523477
Left operator control unit shown.
Remove cover (10) from connector "J1" (12). Remove cover (9) from connector "J2" (11) .Note: The "J1" connector can be identified on either ECM by the rectangular protrusion in front of the connector.
Illustration 7 g02523503
Connector J1 and connector J2 pin locations.
Insert black spoon of Tool (B) into pin "45" (C234-BK wire) of connector "J1" (12). Connect black spoon to Tool (A) .
Insert red spoon from Tool (B) into pin "16" (370-BU wire) of connector "J2" (11). Connect red spoon to Tool (A) .
Set Tool (A) to read "duty cycle".
Move engine start switch (7) to the ON position. Do not start the engine.
Value on Tool (A) should be 10 5 percent. If the value is outside the specified range, go to Step 22.
Illustration 8 g02523510
Left operator platform shown.
Slowly and steadily depress brake pedal (13) against the stop. Observe reading on Tool (A). The value should steadily increase as the pedal is moved down. The value should not stop increasing until the pedal reaches the stop. When the pedal is against the stop, value on Tool (A) should be 78 5 percent.
Slowly and steadily release brake pedal (13). Observe reading on Tool (A). The value should steadily decrease as the pedal is moved up. The value should not stop decreasing until the pedal reaches the stop.
Move engine start switch (7) to the OFF position.
Remove the tooling. Replace