DAMPER & PULLEY GP 3610069 - Caterpillar

Be sure the engine has been shut off for a minimum of five minutes to ensure that the accumulator oil pressure is zero. The accumulator is filled with dry nitrogen. Do not remove any hoses until the nitrogen pressure has been released. A bleed valve at the top of the accumulator can be used to release any pressure that is left in the system. Open the bleed valve only one turn to release the pressure. Failure to follow this procedure can result in personal injury.
1. Open bleed valve (1) only one turn to release the nitrogen pressure from the accumulator. 2. Fasten Tool (A) and a hoist to accumulator (2) as shown. 3. Disconnect hose assembly (3) from the bottom of the accumulator. Put a plug in the hose assembly to prevent oil loss and to keep dirt out of the hydraulic system.4. Remove two bolts (4) and the washers that hold the accumulator in position. Carefully remove the accumulator from the machine. The weight of the accumulator is 54 kg (120 lb). The following steps are for the installation of the accumulator.5. Check the condition of the O-ring in the end of hose assembly (3). If the seal is damaged, use a new part for replacement.6. Install accumulator (2) in the reverse order of removal.7. After the accumulator is installed in the machine, test and charge it with nitrogen. See the topic "Testing And Charging The Accumulators" in the 621F, 623F & 627F Wheel Tractor Scraper Cushion Hitch Systems Operation Testing & Adjusting module, SENR6825.8. Check the oil level in the hydraulic oil tank. If necessary, fill the hydraulic oil tank with oil to the correct level. For the correct filling procedure, see the Operation & Maintenance Manual for 623F Elevating Wheel Tractor-Scrapers, SEBU6720.Disassemble & Assemble Accumulator
Start By:a. remove accumulator1. Remove cover (4) from the accumulator.2. Fasten Tool (A) to the nitrogen charging valve in the top of the accumulator. Open the valve slowly to release the nitrogen from the accumulator.3. Remove valve assembly (3) and washer (5) from head (9).4. Using Tool (B), remove head (9) from the accumulator.5. Remove ring (2) and O-ring seal (1) from the head.6. Remove the plug in the bottom of the accumulator.7. Using a press through the plug hole opening, push piston (6) out the top of the accumulator.8. Remove wear ring (8) and seal assembly (7) from the piston. The following steps are for the assembly of the accumulator. Refer to Illustration C73909P1 for assembly of the accumulator.9. Be sure all parts of the accumulator are thoroughly clean prior to assembly.10. Check the condition of the O-ring seals, back-up ring and wear ring used in the accumulator. If any of the parts are worn or damaged, use new parts for replacement.11. Install wear ring (8) and seal assembly (7) on piston (6). 12. Partially install piston (6) in the accumulator by hand in the position shown. Using a press, push the piston to the bottom of the accumulator.13. Install