TURBOCHARGER GP 6N8953 - Caterpillar

Illustration 1 g03531542
(11) Secondary steering pump
(12) Secondary steering pump motor
(13) Secondary steering pump motor relay
(25) Hydraulic oil tank Ensure that the oil is at operating temperature. Refer to Systems Operation, Testing and Adjusting, "General Information" for information on warming the oil.Park the machine on a level surface. Move the parking brake control to the ENGAGED position and shut off the engine. Install the steering frame lock. Refer to Operation and Maintenance Manual, "Steering Frame Lock".
Illustration 2 g03531456
(5) Steering system pressure switch
(7) Brake charge control solenoid
(9) Service brake pressure sensors
(26) Main combination valve
(T1) Brake pump discharge pressure test port
(T2) Brake accumulator charge pressure test port
(T5) Steering pressure test port
Remove the dust cap and install a 25000 kPa (3600 psi) pressure gauge to the test fitting (T5).
Turn the engine start switch to the one position.
Illustration 3 g03531516
(16) Secondary steering pump motor test switch Note: Do not operate the secondary steering pump motor for more than 30 seconds at a time with the engine OFF. Allow at least 3 minutes between test cycles to allow the batteries to recover.
Press the switch in order to activate the electric drive pump. Hold the switch and record the pressure that is displayed on the pressure gauge. This reading is the standby pressure of the secondary steering system. The standby pressure of the secondary steering system should be 5000 1200 kPa (725 175 psi).
Release the switch in order to deactivate the electric drive pump.
Press the switch and hold the switch.
Rotate the steering wheel clockwise until the steering frame lock prevents the machine from articulating. Record the pressure that is displayed on the pressure gauge. This reading is the maximum pressure of the secondary steering system.
Rotate the steering wheel counterclockwise until the steering frame lock prevents the machine from articulating. Record the pressure that is displayed on the pressure gauge. This reading is the maximum pressure of the secondary steering system.The maximum pressure of the secondary steering system should be 20675 1375 kPa (3000 200 psi).
Release the switch.
Turn the engine start switch to the OFF position and remove the pressure gauge from the machine.
Remove the steering frame lock. If the maximum pressure and the standby pressure of the secondary steering system are incorrect, there may be a problem with the electric drive pump. Or, with one of the components of the secondary steering system.