CYLINDER 1H9575 - Caterpillar

Introduction
This information includes the following test:
High-Pressure CutoffThis information includes the following adjustment procedure:
Adjustment Procedure (High-Pressure Cutoff)Required Tools
Illustration 1 g03630357
Tooling (A) 198-4240 Digital Pressure Indicator Gp
Table 3
Tool Item Qty Part No Description
A 198-4240 Digital Pressure Indicator Gp
A1 1 198-4234 Digital Indicator
A2 1 198-4237 Pressure Sensor Gp
(0 to 3,445 kPa (0 to 500 psi))
A2 1 198-4238(1) Pressure Sensor Gp
(0 to 34,450 kPa (0 to 5,000 psi))
A2 1 198-4239 Pressure Sensor Gp
(0 to 41,368 kPa (0 to 6,000 psi))
A2 1 251-9600(2) Pressure Sensor Gp
(0 to 68,900 kPa (0 to 10,000 psi))
A3 1 198-4236 Adapter Cable As
(1) This sensor must be purchased separately. The sensor is not included in the 198-4240 Digital Pressure Indicator Gp
(2) This sensor can only be used on large diameter pressure taps like 6V-3965 Fitting.Test Preparation
Refer to Testing and Adjusting, "Machine Preparation for Troubleshooting".Refer to Testing and Adjusting, "System Pressure Release".
Illustration 2 g03731378
Steering Frame Lock in the LOCKED Position
Move steering frame lock to the LOCKED position.Test Procedure
Prepare the machine for testing by completing the procedure that is specified in the Service Manual module Testing and Adjusting, "Machine Preparation for Troubleshooting" for the machine that is being serviced.
Illustration 3 g03731789
Brake/Fan Valve is located in the Hydraulic Service Center on the right side of the machine.
(1) Fan solenoid
(2) Fan pump discharge pressure port
Disconnect the harness from the fan solenoid (1) located in back of the solenoid.
Connect a pressure gauge that can sustain pressures up to 34450 kPa (5000 psi) to the fan pump discharge pressure port (2). The port is located in the hydraulic service center as shown in Illustration 3.Note: The pressure will need to be released out of the system to attach the pressure gauge.
Start the engine. The engine should be at high idle throughout the warmup procedure. Continuously stall the TILT BACK position and simultaneously raise the lift arms at full speed. When the lift arms are almost raised, cycle the tilt cylinder to the FULL DUMP position. Then cycle to the TILT BACK position. Continuously stall the TILT BACK function and simultaneously lower the lift arms back to ground level. Without stalling the rack back function, cycle lift function to raise and lower the lift arms. This procedure will allow the pump to operate at low pressure and circulate oil throughout the system. Repeat this procedure until the hydraulic oil is at 62° 8°C (143.6° 14.4°F)
Increase the engine speed to high idle.
Observe the pressure reading. The cutoff pressure should be 22500 700 kPa (3260 100 psi). If the cutoff pressure is correct proceed to Step 7 in the next section. If the cutoff pressure is not correct, proceed to the following section for instructions to adjust the cutoff pressure.Adjustment Procedure
Turn off machine.
Illustration 4 g03731801
(3) Adjustment locknut for cutoff pressure.
Locate the fan pump on the right rear of the machine in the engine compartment. See Illustration 4.
Loosen locknut (3) and use an internal hex wrench to adjust the pressure. Turn the