SEAL 0617776 - Caterpillar

Air under pressure can cause personal injury. Before working on or around the air systems and components observe the following precautions.
a. Move the machine to a smooth and level location away from other working machines and personnel. Block the wheels and stop the the engine.b. Keep clear of actuator pushrods and linkages when the system is being operated in any way.c. Do not remove plugs or lines, or disassemble components unless you are sure that all air pressure is exhausted.d. Do not disassemble a components unless you have read and understood the correct procedures. Some components contain powerful springs. Injury can result from incorrect disassembly.
Typical Example1. Install tooling (A) and a hoist on the accumulator (3). Disconnect line (2) from the accumulator.2. Unfasten metal mounting strap (1) from the accumulator. Remove accumulator (3). Weight of the accumulator is 59 Kg (130 lbs.). The following steps are for the installation of the accumulator.3. Put accumulator (3) in position with tooling (A) and a hoist and fasten metal mounting strap (1) that holds it in position.4. Connect line (2) to the accumulator.
If the accumulator needs to be charged, dry nitrogen is the only gas approved for use in the accumulators. The charging of the oxygen gas in these components by accident will cause an explosion. This danger can be avoided by the use of nitrogen cylinders with standard CGA (Compressed Gas Association Inc.) No. 580 connections. Do not go by color codes or other methods of identification to tell the difference between nitrogen and oxygen cylinders. In any application never use an adaptor to connect your nitrogen charging group to a valve outlet used on both nitrogen, oxygen or other gas cylinders. Be sure you use dry nitrogen.
To check and adjust the nitrogen precharge use tool group (A).Disassemble & Assemble Accumulator
Start By:a. remove accumulator 1. Mount the accumulator onto a suitable holding device. Place two bolts into holes on end cap. Place bar (C) between two bolts. Remove the end cap. Before installing the end cap, replace the O-ring. Then, tighten the end cap to a torque of 610 N m (450 lb ft). 2. Remove backup seal (2) and O-ring seal (1) from end cap (3). 3. Remove circle clip (4) with tooling (B), then remove poppet (6) and poppet guide (5) from end cap (3). 5. Attach tooling (A) to piston (7) and remove the piston.6. Remove the two seal assemblies and wear ring from the piston. Remove other end cap only if necessary. If removed, refer to the topic, Accumulator, Charge & Test Procedure for further information. The following steps are for the assembly of the accumulator.7. Make sure the inside of the accumulator is clean and free of dirt and foreign material.8. Install poppet guide (5), poppet (6) and install circlip (4).9. Install the two new seal assemblies and new wear ring to piston (7).10. Fasten tooling (A) to the piston and push the piston to the bottom of the accumulator.11. Install new backup seal (2)