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Personal injury or death can result from sudden machine movement. Sudden movement of the machine can cause injury to persons on or near the machine. To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before operating the machine. |
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Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand. |
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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 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. |
Probable Causes of Problems in the "Air on the Run" System
Problem
The pump is excessively noisy.
Probable Cause
- The pump is cavitating.
- The oil is too thick.
- The ambient temperature is too low.
- There is air in the hydraulic oil.
- The pump is worn or damaged.
Problem
The pump is excessively hot.
Probable Cause
- The pump is cavitating.
- The oil cooler is plugged.
- The hydraulic oil is overheated.
- There is air in the hydraulic oil.
- The pump is worn or damaged.
- There is internal pump leakage.
- There is an excessive load on the pump.
Problem
There is no hydraulic oil pressure.
Probable Cause
- There is no hydraulic oil flow.
- The relief valve may have failed.
Problem
There is no hydraulic oil flow.
Probable Cause
- The pump is not receiving fluid.
- The oil cooler is plugged.
- The pump is improperly assembled.
- There is air in the hydraulic oil.
- The level of the hydraulic fluid is low.
- There is a plugged hydraulic line.
Problem
There is a low amount of hydraulic oil flow.
Probable Cause
- The fittings are loose.
- There is an external leak in the hydraulic system.
- The pump has leaking gaskets or seals.
- The pump is worn.
Problem
The air compressor operates at a high temperature.
Probable Cause
- There is a dirty filter for the air intake.
- The crankcase oil level is low.
Problem
The air compressor will not stop running.
Probable Cause
- The air pressure switch is incorrectly set.
- Leak in hoses or fittings.
- Electrical short circuit
Problem
The air compressor will not run, or the air compressor runs slowly.
Probable Cause
- The hydraulic pump is worn.
- The hydraulic motor is worn.
- The relief valve may be improperly set.
- The relief valve may be faulty.
Problem
The air pressure is too low.
Probable Cause
- The air pressure switch is incorrectly set.
- Leak in hoses or fittings.
- A leak has developed in the rotary valve or the tire.
Problem
The air pressure is too high.
Probable Cause
- The air pressure switch is incorrectly set.