Usage:
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To prevent possible injury, the pressure from the hydraulic system must be released. The accumulator will bleed down through the steering metering pump when it is in the Neutral (non-steer) position. With the engine off, accumulator bleed down takes eight minutes. To bleed down the accumulator sooner, turn the steering wheel to the right and to the left. The accumulator is charged to 6900 kPa (1000 psi) with dry Nitrogen. |
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1. Remove two bolts (6) and strap (2).
2. Disconnect fitting (4) and remove accumulator (3) from block (7).
NOTE: The following steps are for disassembly of the accumulator.
3. Remove cap (1) and the O-ring. Depress the valve core to remove all gas from the bladder. Remove the valve core from the bladder.
4. Remove fitting (13) and nut (11) and exposed spacer (10) from foot valve (12).
5. Remove O-ring and washer from foot valve (12).
6. Push foot valve (12) into accumulator shell (3). Fold and remove anti-extrusion ring (14). Remove foot valve (12) from the shell.
7. Remove nut (9) and push valve stem (8) into shell (3).
8. Remove bladder (15) from the shell.
NOTE: The following steps are for cleaning and inspection.
9. After disassembly, clean all parts with an approved cleaning solution such as stanisol, (stoddard solvent) or Hydrosolv 4165 (8T7570) [available in U.S. and Canada only through the Caterpillar parts system or your nearest Caterpillar Dealer in 208L (55 U.S. Gal.) drum]. Blow all parts dry with air and place them where they will be free from dirt or other foreign material.
10. Check elastomer items for deterioration, abrasion marks, cracks, holes, bubbles or any similar defects.
11. The bladder must be checked for leakage using the following procedure.
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To prevent possible personal injury or damage to the bladder, do not overinflate the bladder outside of the shell. |
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12. Install the valve core in the valve stem. Inflate to normal size .44 kPa (3 psi) maximum.
13. Using a soapy solution, check the bladder for leaks. If a leak is detected, the bladder must be replaced with a new bladder.
14. After testing, deflate the bladder immediately. Remove valve core from valve stem.
NOTE: The following steps are for installation of the accumulator.
15. Expel all air from the bladder and fold longitudinally into a compact roll. Install the valve core to retain this condition.
16. Coat the entire inside surface of the shell with clean hydraulic fluid.
17. Insert bladder (15) into shell (3). Install nut (9) on valve stem (8). Tighten nut (9) to a torque of 50 ± 10 N·m (37 ± 7 lb.ft.). Install the O-ring and cap (1).
18. Pour a liberal amount (up to 10% of volume) of clean hydraulic fluid into the shell to lubricate and cushion the bladder.
19. Install foot valve (12) into the shell. Fold anti-extrusion ring (14); pass the ring through the opening in the shell and place in position internally with the steel collar at the shell mouth. Pull foot valve (12) through anti-extrusion ring (14).
20. Install washer (16) and O-ring (17) on foot valve (12).
21. Install exposed spacer (10) and nut (11) on foot valve (12). Install fitting (13) on the foot valve.
22. Position the accumulator (3) under the cab and connect fitting (4) to block (7).
23. Install strap (2) and two bolts (6).
24. To precharge the accumulator, refer to form no. SENR3489, Systems Operation, Testing and Adjusting 12G, 120G, 130G and 140G Hydraulic System and Steering, Testing and Charging the Accumulator.