TRACK AS-LEFT REAR 0820407 - 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.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Illustration 1 g00635900
Front Control ValveLocation of purge screwsNote: The purge screws on the opposite side of the control valve are not shown.
Illustration 2 g00635901
Rear Control ValveLocation of purge screwsNote: The purge screws on the opposite side of the control valve are not shown.
Illustration 3 g00635902
Swing Control ValveLocation of purge screws
Start the engine.
Set the throttle to position (1) .
Open the purge screw.
Allow oil to flow out of the purge screw until there is no indication of air.
Close the purge screw.