ACTUATOR G DIF 6U5266 - Caterpillar

Illustration 1 g00525808
(1) Pressure and flow compensator valve (2) Flow compensator valve (3) High pressure cutoff valvePressure and flow compensator valve (1) is mounted to the case of the steering piston pump. The steering piston pump is the third pump that is mounted in tandem with the hoist and brake gear pump. The hoist and brake gear pump is mounted to the flywheel housing near the torque converter.
Illustration 2 g00525834
(4) Steering check and relief valve (SS) Pressure tap for the steering systemSteering check and relief valve (4) is located on the frame behind the right front suspension cylinder.High Pressure Cutoff Valve
Illustration 3 g00525846
(1) Pressure and flow compensator valve (3) High pressure cutoff valve (5) Cap (6) Setscrew (7) Locknut
Start the engine.
Operate the engine at HI IDLE. Turn the steering wheel to the right or turn the steering wheel to the left until the steering cylinder stop is reached. Then, continue turning the steering wheel against the stop. Hold the steering wheel in this position for three seconds and then release the steering wheel. Continue this step until the oil in the steering system reaches at least 38 °C (100 °F).
Check the steering system pressure by installing a 8T-0860 Pressure Gauge 40000 kPa (5800 psi) at pressure tap (SS) for the steering system. Pressure tap (SS) is located on steering check and relief valve (4) behind the right front suspension cylinder.
Operate the engine at HI IDLE. Turn the wheels to the right or the left and keep turning the steering wheel. Check the pressure while you are turning the steering wheel. The pressure setting of the high pressure cutoff valve is 23500 350 kPa (3410 50 psi).
If the pressure needs to be adjusted, stop the engine.
Remove cap (5) from setscrew (6) on high pressure cutoff valve (3) .
Loosen locknut (7) of high pressure cutoff valve (3) .
With an allen wrench, rotate setscrew (6) clockwise by 1/4 turn in order to raise the pressure. Rotate setscrew (6) counterclockwise by a 1/4 turn in order to lower the pressure. Each 1/4 turn of setscrew (6) changes the pressure approximately 1310 kPa (190 psi).
Repeat Steps 1 through 9 until the pressure setting is correct.
Personal injury or death can result from improperly checking for a leak.Always use a board or cardboard when checking for a leak. Escaping air or fluid under pressure, even a pin-hole size leak, can penetrate body tissue causing serious injury, and possible death.If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury.
If the pressure is low, and if the pressure does not increase with this method, there is excessive leakage in the system. Use the following steps to locate the leak.
Check the setting of the primary steering backup relief valve. Perform the Steering System Testing and Adjusting, "Relief Valve (Primary Steering Backup) - Test and Adjust".
If the setting of the primary steering backup relief valve is correct, disassemble spool (3) of pressure and flow compensator valve (1) for high