CONTROL GP-ELECTRONIC 4594756 - Caterpillar

Illustration 2 g01225941
Make sure that water spray switch (9) is in the OFF position.
Make sure that the conveyor will not contact any obstacles when the machine is raised.
If necessary, use conveyor joystick (7) in order to lower the conveyor.
Move elevation control switch (8) (all legs) to the RAISE position. Release the switch when the machine is completely raised.
Move throttle switch (10) to the LOW IDLE position.
Move engine hood switch (6) to the RAISE position. Hold the switch until the hood is completely open.
Illustration 3 g01225945
Install hood prop rod (11) .
Move engine hood switch (6) to the LOWER position. Release the switch when the hood prop rod is seated.
Move key switch (5) to the OFF position.
Illustration 4 g01225946
Install leg lock (12) on each of the four legs.
Remove the rear access panel from the bottom of the machine.
Illustration 5 g01226729
Unplug the connector for parking brake solenoid (13) .Note: Parking brake solenoid is on the right face of the rear manifold. The L939-GN wire and the 200-BK wire are connected to the solenoid.
Illustration 6 g01226732
Install tool (C) (15) in the pressure tap in port "P1" (14) on the flow divider.
Use Tool (B) in order to connect Tool (C) to Tool (A) .
Move key switch (5) to the START position. Release the key switch when the engine starts.
Operate the engine for a few minutes at low idle. Move throttle switch (10) to the HIGH IDLE position. The engine speed should increase to 2250 rpm.
Monitor the hydraulic oil temperature with Tool (D). Operate the machine until the oil temperature reaches a minimum of 40 °C (104 °F).
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.
Note: The travel mode switch must be in the H position during this test. If the travel mode switch is in the L position, the machine may drive through the parking brake. If the machine moves at any time during this test, immediately move the propel lever to the NEUTRAL position. Stop the machine and repair the parking brakes before this test is continued and/or before the machine is placed back into service.
Illustration 7 g01226742
Move travel mode switch (16) to the H position.
Move parking brake switch (2) to the OFF position.
Move travel direction switch (17) to the FORWARD position.
Slowly move propel lever (3) out of the NEUTRAL position. Stop moving the propel lever when the pressure on Tool (A) stabilizes.
Record the pressure shown on Tool (A) as "forward pressure". Forward pressure should be 37700 690 kPa (5470 100 psi).
Move the propel lever to the NEUTRAL position.
Move travel direction switch (17) to the REVERSE position.
Slowly move propel lever (3) out of the NEUTRAL position. Stop moving the propel lever when the pressure on Tool (A) stabilizes.
Record the pressure Tool (A) as "reverse pressure". Reverse pressure should be 37700 690 kPa (5470 100 psi).
Move the propel lever