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Personal injury or death can result from escaping fluid under pressure. Escaping fluid under pressure, even a very small pin-hole size leak, can penetrate body tissue and cause 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. |
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Sudden movement or accidental starting of the machine can cause personal injury or death to persons on or near the machine. To prevent personal injury or death, perform the following: Park the machine on a smooth, level surface. Lower the work tool to the ground and engage the parking brake. Stop the engine and remove the key. Block the wheels and install the steering frame lock. |
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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, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products. Dispose of all fluids according to local regulations and mandates. |
Before any tests are performed, visually inspect the entire braking system for oil leaks and for damaged parts.
When you diagnose a problem in the braking system, a visual inspection of the hydraulic system is the first step.
Note: When any test is performed on the braking system, the hydraulic oil must be at normal operating temperature. To increase the oil temperature, start the engine and turn the machine in both directions. Also, depress the brake pedal repeatedly.
Stop the engine and lower the implement to the ground. Release the pressure in the steering system and in the braking system.
Reference: For the correct procedure for releasing the system pressure, refer to Testing and Adjusting, "System Pressure - Release".
Perform the following inspections:
- Check the oil level in the hydraulic oil tank.
- Check for air in the hydraulic oil immediately after the engine is stopped. Use a clear container to obtain an oil sample from the sampling valve on the pilot oil pump. Look for air bubbles in the oil that is in the container.
- Check for flow restrictions in all oil lines. Flow restrictions include bends in the oil lines, clamps that are not installed correctly, and damage to hoses and to lines. Check all hydraulic connections and the brake control linkage for damage or for leaks.
- Remove the filter elements and check the elements for particles. Use a magnet to separate ferrous particles from nonferrous particles.