BUSHING 0826424 - Caterpillar

Hydraulic oil pressure can remain in the hydraulic oil system on this machine after the engine and pump have been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic systems. To prevent possible injury, refer to the procedure in Testing and Adjusting Manual, "Release of Pressure in the Hydraulic System".When possible, the bucket must always be lowered to the ground before service is started. When it is necessary for the boom to be in the raised position while tests or adjustments are done, be sure that the boom, stick and bucket have correct support.Be sure the swing parking brakes and the travel parking brakes are on and the brake release lines are disconnected and plugged.Always move the machine to a location away from the travel of other machines. Be sure that other personnel are not near the machine when the engine is running and tests or adjustments are being made.
Table 1
Required Tools    
Part Number    Part Description    Qty    
4C-4892     ORFS Fittings Group     1    
8T-0860     Pressure Gauge     1    Note: Always warm the hydraulic oil to a minimum temperature of 50°C (122°F) before starting the testing and adjusting procedure.Preparation
Illustration 1 g00458026
Swing Drive (1) Brake release lineDisconnect the brake release line (1) for the swing parking brakes at the left swing drive. Plug the brake release line but leave the tee port open. This will ensure that the swing brakes will not release when the swing function is actuated.
Illustration 2 g00457227
View of the High Pressure Screens From the Rear (2) Swing high pressure screen (3) Pressure tap for the swing systemInstall a 40000 kPa (5800 psi) pressure gauge at the pressure tap (3) on the swing high pressure screen (2) in order to measure the pressure in the swing system.
Illustration 3 g00407262
The swing dual pressure relief valve is located under the floor grate beneath the ladder. (4) Swing dual pressure relief valve
Illustration 4 g00407279
Swing Dual Pressure Relief Valve (5) Swing acceleration pressure spool (6) Shims for swing acceleration pressure setting (7) Swing deceleration pressure spool (8) Shims for swing deceleration pressure settingAcceleration Pressure Setting
Start the engine.
Warm the oil to a minimum temperature of 50 °C (122 °F). Refer to the Testing and Adjusting, "General Information" for the proper procedure for warming the hydraulic oil.
Set the throttle switch to position 10.
Slowly actuate the swing control to the full left position or the full right position in order to stall the swing motors against the swing brakes. This checks the acceleration pressure setting of the swing dual pressure relief valve. Record the pressure that is indicated by the gauge that is installed on the pressure tap. The acceleration pressure setting for the swing system should be 35000 1000 kPa (5080 145 psi).
Remove the cover. Add or remove shims (6) in order to adjust the pressure. Each 0.13 mm (0.005 inch) shim will change the pressure setting by 210 kPa (30.5 psi).Deceleration Pressure Setting
Illustration