VALVE GP 9J9776 - Caterpillar

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 3 g03231956
Move steering frame lock to the LOCKED position.
Engage the parking brake. Move the transmission direction selector to the NEUTRAL position.
Position the machine so that the machine is pointing straight ahead.
Bumping or turning the steering wheel could cause excessive oil pressure in the hydraulic oil line that connects to the pressure gauge. The excessive oil pressure could cause damage to the pressure gauge.Do not bump or turn the steering wheel during the following steps.
Test Procedure
Illustration 4 g03231959
(1) Location of pressure taps
Illustration 5 g03231958
(2) Pressure tap for the steering pump pressure
Attach a 0 to 6000 kPa (0 to 870 psi) pressure gauge to pressure tap (2).
Start the engine. Operate the engine at high idle. Continuously stall the RACK BACK function while simultaneously raising the lift arms at full speed. When the lift arms are almost raised, cycle the tilt cylinder almost to the FULL DUMP position. Then move the tilt cylinders to the full RACK BACK position. Continuously stall the RACK BACK function and simultaneously lower the lift arms back to the ground level position. Without stalling the RACK BACK function, cycle the lift function to raise the lift arms fully. Then lower the lift arms in order to allow the pump to operate at low-pressure briefly and circulate oil through the system. Repeat this process in order to increase the temperature of the oil to normal operating temperature.
After the oil has reached normal operating temperature, position the bucket and any attachments slightly off the ground. Run the engine at high idle.
Record the pressure reading on the pressure gauge. The reading should be 3900 kPa (566 psi).
Adjust the flow compensator valve if the pressure is not correct. Note: Do not adjust the steering pump based on the results of this test. If the pressure reading is not correct, test the margin pressure. See the following reference for the correct procedure to test the margin pressure.
Stop the engine. Lower the bucket and any attachment to the ground.
Remove the hydraulic line and the pressure gauge from pressure tap (2). Reference: For additional information on testing the margin pressure, refer to Testing and Adjusting, "Piston Pump (Steering) Margin Pressure - Test and Adjust" for the machine that is being serviced.Adjustment Procedure (Low Pressure