General Information
When you are analyzing a hydraulic system for poor performance, remember that correct oil flow and correct oil pressure are necessary for correct operation. Oil flow is a function of the pump output. The pump output is a function of engine speed. A restriction to the flow of oil causes oil pressure.
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Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine. To prevent possible injury, perform the procedure that follows before testing and adjusting the brake system. |
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Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. 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 in Caterpillar machines. Dispose of all fluids according to local regulations and mandates. |
- Move the machine to a smooth, horizontal location. Move the machine away from other operating machines and away from personnel. Stop the engine.
- Permit only one operator on the machine. Keep all other personnel away from the machine or in sight of the operator.
- Engage the parking brake. Lower the bucket or the attachment to the ground. Put blocks in front of the wheels and behind the wheels.
- Install the steering frame lock.
- In order to relieve any brake oil pressure, push on the brake pedal many times.
- In order to relieve all of the pressure in the hydraulic oil tank, slowly loosen the filler cap.
- Make sure that all oil pressure is released before you begin any work on the brake hydraulic system.
Caterpillar Information System:
793B Off-Highway Truck Light Switches
793C Off-Highway Truck Power Train Neutral Start Control
938G Wheel Loader and IT38G Integrated Toolcarrier Machine Systems Solenoid Valve and Manifold (Ride Control, Head End) - Remove and Install
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938G Wheel Loader and IT38G Integrated Toolcarrier Machine Systems Window Wiper and Wiper Motor
793C Off-Highway Truck Turn Signal and Warning Switch
Challenger 65E, Challenger 75E, Challenger 85E and Challenger 95E Agricultural Tractors Power Train Frame
Challenger 65E, Challenger 75E, Challenger 85E and Challenger 95E Agricultural Tractors Power Train Transmission Oil Filter
793C Off-Highway Truck Power Train Hoist Control Lever
793C Off-Highway Truck Air System and Brakes Hydraulic System Schematic
938G Wheel Loader and IT38G Integrated Toolcarrier Machine Systems Ride Control Accumulator - Remove and Install
3500B Engines for Caterpillar Built Power Modules Engine Oil Pump
938G Wheel Loader and IT38G Integrated Toolcarrier Lift Kickout
938G Wheel Loader and IT38G Integrated Toolcarrier Machine Systems Solenoid Valve and Manifold (Ride Control, Rod End) - Remove and Install
793B Off-Highway Truck Power Train Solenoid Valve (Upshift and Downshift)
793C Off-Highway Truck Power Train Lockup Solenoid
938G Wheel Loader and IT38G Integrated Toolcarrier Machine Systems Seat - Remove and Install
3512 and 3516 EUI Engines and 784B, 785B, 789B and 793B Off-Highway Truck/Tractors Vibration Damper
938G Wheel Loader and IT38G Integrated Toolcarrier Drive Shaft Spline (Center) - Lubricate
793C Off-Highway Truck Window Wiper and Washer Control
793C Off-Highway Truck Brake Release Switch
793B Off-Highway Truck Automatic Electronic Traction Aid (AETA)
3512 and 3516 EUI Engines and 784B, 785B, 789B and 793B Off-Highway Truck/Tractors Crankshaft
938G Wheel Loader and IT38G Integrated Toolcarrier Braking System Visual Inspection