WASHER 8T1223 - Caterpillar

Illustration 2 g02571852
Tooling (A) 198-4240 Digital Pressure Indicator Gp
Table 4
Required Tools
Tool Item Qty Part No Description
A 198-4240 Digital Pressure Indicator Gp
A1 1 198-4234 Digital Indicator
A2 1 198-4238(1) Pressure Sensor Gp
(0 to 34,450 kPa (0 to 5,000 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 GpTest Preparation - Charge Pressure Relief Valve
Move the machine to a smooth, horizontal location that is away from operating machines and away from personnel.
Permit only one operator on the machine. Keep all other personnel away from the machine or in the sight of the operator.
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 shutoff control is in the UNLOCKED position.
Move the implement control levers and the transmission control lever through the full range of travel several times. Movement of the implement control levers will relieve any pressure that may be present in the implement hydraulic system and the power train system.
Loosen the filler cap on the hydraulic tank so that the pressure in the tank is released. The machine may be equipped with a breaker valve. The breaker valve will be located on top of the tank. To release the pressure in the tank, press the button on top of the breaker valve.
Tighten the filler cap on the hydraulic tank.
Make sure that the pressure in the entire hydraulic system has been released. Reference: For additional guidance with preparing the machine for testing, refer to the Testing and Adjusting manual or the Troubleshooting manual for your machine.Note: The monitoring system (if equipped) for your machine accesses many values that are useful in troubleshooting the hydraulic system. When the situation is appropriate, use the monitoring system in order to find a pressure or determine a system problem.
Open the access door on the right fender of the machine.
Illustration 3 g03873971
"H" Pressure of steering charge pump at the filter outlet
Attach tooling (A) to pressure tap (H). Test Procedure - Charge Pressure Relief Valve
Perform steps in the "Test Preparation - Charge Pressure Relief Valve" section.
Start the engine. Warm the hydraulic oil to 45° 15°C (113° 27°F).
Operate the engine at HIGH IDLE.
Leave the controls in the NEUTRAL position. Record the pressures at pressure taps (H).
Read the engine speed and the pressure at pressure taps (H). Record the engine speed and the pressure at taps (P9) into Table 1 of the "Introduction". The pressure at tap (H) should be 3300 140 kPa (478 20 psi).
If the charge pressure is higher or lower than the specification, then the charge pressure relief valve could be faulty or out of adjustment.
If the pressure at tap (H) is out of the specification range and the steering controls are in the NEUTRAL position, the reason may appear below.
There is a faulty charge relief valve