CASE & PARTS GP-PLANETARY 2538351 - Caterpillar

Illustration 3 g03885216
Typical view of Cat ET
With the engine at HIGH IDLE, slowly move the steering control lever to the MAXIMUM STEER RIGHT position. The steering system is in a STEER STALL CONDITION. Note: Due to system limitations HIGH IDLE is limited to 1800 rpm when the machine is in NEUTRAL.Note: Do not hold the machine in a STEER STALL CONDITION for more than 20 seconds at a time.Note: The machine must not move. If the machine moves, the brake system must be checked.
With the machine in a STEER STALL CONDITION, read the "Primary Steering System Pressure". Record this pressure into Table 1 of the "Specifications". This pressure should be 45300 1140 kPa (6570 165 psi).
With the engine at HIGH IDLE, slowly move the steering control lever to the MAXIMUM STEER LEFT position. The steering system is in a STEER STALL CONDITION. Note: Do not hold the machine in a STEER STALL CONDITION for more than 20 seconds at a time.Note: The machine must not move. If the machine moves, the brake system must be checked.
With the machine in a STEER STALL CONDITION, read the "Primary Steering System Pressure". Record this pressure into Table 1 of the "Specifications". This pressure should be 45300 1140 kPa (6570 165 psi).
If the "Primary Steering System Pressure" is not in specifications, the cause may be listed below. If the "Primary Steering System Pressure" is higher than the specifications, the pump cutoff pressure must be lowered. Additional causes may be listed below.If the "Primary Steering System Pressure" is lower than the specifications, the cause may be listed below.
The pressure over-ride valve is misadjusted or failed.
The motor flushing valve is stuck or the valve is not functioning properly.
The motor is worn or leaking.
The charge pressure is low.
The pump is worn or leaking.
The crossover relief and makeup valve is leaking or the crossover relief and makeup valve is set too low.
If the engine speed drops more than 30 rpm in either steering direction during the test, the corresponding crossover relief and makeup valve may be leaking or set too low. Adjustment Procedure (Pressure Over-ride Valve)
Illustration 4 g01789976
Steering pump port plate (front view)
(1) Locknut
(2) Adjustment screw
(3) Cap
Stop the engine.
Remove cap (3). Loosen locknut (1). Turn adjustment screw (2) clockwise in order to increase the pressure setting or turn the screw counterclockwise in order to decrease the pressure setting. Each turn changes the pressure by 9700 kPa (1400 psi). Note: To decrease the setting, turn adjustment screw (2) counterclockwise past the desired pressure setting. Then, turn adjustment screw (2) clockwise to the correct pressure setting. This method of adjusting the pressure setting eliminates any movement in the threads.
Tighten locknut (1). Check the pressure setting. Test Preparation (Crossover Relief/Makeup Valves)
Move the machine to a smooth horizontal location.
Place the steering control lever in the NEUTRAL position.
Engage the parking brake.
Lower the attachments to the ground.
Stop the engine.
Turn the key to the ON position, but do not start the engine.
Verify that the implement lockout switch is in the UNLOCKED