DOOR GP-ACCESS 2087562 - Caterpillar

Illustration 3 g02149200
The pressure tap is located behind an access door on the right fender of the cab. (HA) Implement pump (discharge pressure)
Illustration 4 g02149201
The pressure tap is located behind an access door on the right fender of the cab. (HB) Signal oil pressure tap
Attach the high-pressure end of Tooling (D) to pressure tap (HA). Attach the low-pressure end of Tooling (D) to pressure tap (HB) .
Illustration 5 g02149200
The pressure tap is located behind an access door on the right fender of the cab. (HA) Implement pump (discharge pressure)
Illustration 6 g02149201
The pressure tap is located behind an access door on the right fender of the cab. (HB) Signal oil pressure tap
Attach Tooling (B) to pressure taps (HA) and (HB) .
Make sure that the steering linkage is correctly adjusted. Refer to the test for low-pressure standby in Testing and Adjusting, "Pump Discharge Pressure - Test" in this module.
Place the main display in the operator station in Service Mode of operation in order to monitor the engine rpm.Test Procedure
Start the engine. Operate the engine at HIGH IDLE. Refer to the Engine Information Plate or refer to the Fuel Settings and Related Information Microfiche. Record the engine rpm.
When the engine is still at HIGH IDLE, move the bulldozer control lever to a midway position between the HOLD and FULL RAISE positions. While the bulldozer blade is being raised, read the pressure differential. Record the reading. The reading on the gauge is called the margin pressure. This pressure differential is the difference between the pump discharge pressure and the signal pressure from the control valve. The margin pressure should be 2100 100 kPa (305 15 psi). If the margin pressure is not correct, refer to Testing and Adjusting, "Pump Control Valve (Steering) - Adjust" for adjustment of the margin pressure and the pressure and flow compensator valve. When the margin pressure is adjusted, the setting should be in the range of 2100 100 kPa (305 15 psi).
Lower the bulldozer blade to the ground. Move all implement control levers to the HOLD position.
Release the parking brakes. Fully activate the service brakes. Position the tiller handle with the speed control in the NEUTRAL position and the direction control in the NEUTRAL position.
Keep the engine running at high idle. Move the tiller handle to the MID STEER RIGHT POSITION. The hydraulic system is now in a steer stall condition.Note: The machine must not move. If the machine moves, the brake system must be checked.
With the machine in a steer stall condition, record the following readings:
Pump discharge pressure from the gauge on the tee side of the pressure differential gauge
Engine rpm
Pressure on the pressure differential gauge
The correct readings from Step 6 follow:
39000 700 kPa (5655 100 psi)
50 rpm or less below the reading from Step 1
A maximum of 345 kPa (50 psi) with a maximum oil temperature of 66°C (151°F)When all of the results are within the specifications, the hydraulic circuit for steering should operate normally. However, an individual implement circuit may still have