Start By:
- Remove the accumulator. Refer to Disassembly and Assembly, "Brake Accumulator (Service) - Remove".
Note: This procedure can be used for the service brake accumulator or the parking brake accumulator.
Note: Cleanliness is an important factor. Before the disassembly procedure, the exterior of the component should be thoroughly cleaned to prevent dirt from entering the internal mechanism.
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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. |
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The accumulator is filled with dry nitrogen. Sudden release of nitrogen pressure can cause personal injury. To avoid personal injury, release the nitrogen pressure from the accumulator before disassembly. |
- Discharge the nitrogen pressure from the accumulator. Refer to Special Instruction, REHS5464, "Accumulator Discharging and Charging Procedures" for the correct procedure to release the nitrogen from the accumulator.
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Illustration 1 g06010290 - Clamp accumulator (1) to a suitable work bench.
- Remove cap (2A) and the O-ring seal.
- Slowly loosen vent screw (2B) to ensure that all pressure has been released. Remove vent screw (2B).
- Remove elbow (2).
- In a clockwise direction, unscrew end caps (3) and (4) in a small amount to remove the pressure on the locking pins (not shown) by using a suitable prybar and two bolts that are positioned 180 degrees apart.
- Remove the labels that are at each end of the cylinder.
- Insert a small, thin screwdriver blade in the end of the cylinder and push the locking pins back into the tube to unscrew the end caps.
- Remove end caps (3) and (4).
- Remove O-ring seals (5) and (6).
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Illustration 2 g01086999 - Push piston (7) out of accumulator (1) in the direction of the fluid side.
- Remove piston seals (8), (9), (10) and (11).
