BELT-SERPENTINE 2893260 - 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 the Service Manual module Operation And Maintenance Manual, SEBU6250, "Lubricant Viscosities".Problem List
Problem List for the Service Brakes
The front service brakes do not operate, and the warning system is not activated.
The rear service brakes do not operate, and the warning system is not activated.
Service brakes slip, and the warning system is not activated.
Service brakes are not applied evenly.
Too much force is needed to push the brake pedals, and the warning system is not activated.Problem List for the Parking Brake
The parking brake does not hold the machine stationary.
The parking brake does not engage when the parking brake control knob is pulled out.Problem List for the Charging System for the Service Brakes
The low oil pressure warning will not turn off.Troubleshooting
Service Brake ProblemsProblem 1: 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 accumulator for the front service brakes is faulty.
The accumulator charging valve is damaged.
The priority flow control valve is damaged.
The piston pump is damaged.Problem 2: 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.
The accumulator for the rear service brakes is faulty.
The accumulator charging valve is damaged.
The priority flow control valve is damaged.
The piston pump is damaged.Problem 3: 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.Problem 4: Service brakes are not applied evenly.Probable causes:
The brake group within the axle housing has air in the hydraulic fluid.
The brake disc and associated components in the axle housing are excessively worn.
The brake valve is sticking because