ARM AS-CONTROL 1514087 - 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.
Table 1
Tools Needed     Qty    
4C-4892 ORFS Fittings Group     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 g00891691
Implement high pressure screens (1) Pressure tap for pump discharge pressureInstall a 60000 kPa (8700 psi) pressure gauge at pressure tap (1). Pressure tap (1) is located on the implement high pressure screens.Drift Reduction Relief Valve
Do not test the implement line relief valves with more than one implement piston pump connected. Testing the line relief valves with multiple pumps connected may result in the relief valves being damaged due to too much oil flow.
Isolate one implement piston pump by disconnecting the power shift signal from the other implement piston pumps. Refer to Testing and Adjusting, "Piston Pump (Implement)".
Illustration 2 g00891663
Drift reduction valves (2) Drift reduction relief valve (boom) (3) Drift reduction relief valve (stick)
Illustration 3 g00891692
Implement and travel control valve (4A) Bucket (rod end) (4B) Boom (head end) (4C) Stick (head end) (4D) Bucket (head end) (4E) Boom (rod end) (4F) Stick (rod end) (5) Load sensing signal relief valve
Exchange drift reduction relief valve (2) or drift reduction relief valve (3) with line relief valve (4A) for the rod end of the bucket circuit.
Turn the adjuster for the implement relief section of the load sensing signal relief valve (5) inward until the adjuster bottoms out. Turn the adjuster for the travel relief section of the load sensing signal relief valve (5) inward until the implement relief pressure is above 39000 kPa (5660 psi).
Illustration 4 g00891694
Drift reduction relief valves (6) Locknut (7) Adjustment screw
Start the engine.
Warm