BRAKESAVER CONTROL VALVE GROUP 9L5979 - Caterpillar

Escaping fluid under pressure, even a pinhole size leak, can penetrate body tissue, causing serious injury, and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury.Always use a board or cardboard when checking for a leak.
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.
This section provides probable causes to known problems. Since there may be several probable causes, specific inspections or instrument tests may be recommended. These inspections and tests will help to identify the causes that are most probable.Note: Make sure that you use an oil with the correct viscosity for the operating conditions.Reference: For additional information about the various lubricant viscosities, refer to Operation And Maintenance Manual, "Lubricant Specifications" for your machine.Problem List
Problem List for the Service Brakes
The accumulator pressure will not reach cut-out pressure at low idle. This typically causes a Warning Category 3 to occur. This may also engage the parking brake.Probable Cause
When the hydraulic oil is hot and the engine is running at low idle, the output of the pump is not sufficient to overcome the pump's own internal losses.
The front service brakes do not operate, and the warning system is not activated.Probable causes
The brake group within the axle housing is damaged.
The lines to the front service brakes are obstructed.
The front circuit of the service brake control valve is faulty.
The rear service brakes do not operate, and the warning system is not activated.Probable causes
The brake group within the axle housing is damaged.
The lines to the rear service brakes are obstructed.
The rear circuit of the service brake control valve is faulty.
Service brakes slip, and the warning system is not activated.Probable causes
One or both axles contain an incorrect hydraulic oil additive.
The brake disc in the axle housing is worn.
The service brakes are not applied evenly.Probable causes
The brake disc and associated components in the axle housing are excessively worn.
The brake valve is sticking because of contaminated oil.
The service brake valve is not delivering the correct amount of pressure.
Too much force needed to push the brake pedals, and the warning system is not activated.Probable causes
The brake pedals and/or brake pedal linkages are damaged.
The brake valve is sticking because of contaminated oil.
Problem List for the Parking Brake
The parking brake does not hold the machine stationary.Probable causes
The parking brake must be adjusted.
The brake linings are excessively worn.
There is grease or oil on the brake drum and/or on the brake lining.
The parking brake does not engage when the parking brake control knob is pulled out.Probable causes
The parking brake cable is disconnected.
The parking brake cable has stretched until the cable will not actuate