336F Excavator Machine Systems Caterpillar

Assembly Procedure

1. Prior to assembly of the accumulator, coat the inside surface of the accumulator with a film of clean hydraulic oil.
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   Illustration 1	g03732913

2. Install wear band (14) and piston seal (15) onto piston (13). Lubricate piston seal (15) and wear band (14) with the lubricant that is being sealed.
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   Illustration 2	g03732909
   View from oil side of the accumulator.

3. Use Tooling (B) in order to install piston (13) in the same end as the gas valve.

   Note: Install piston (13) just far enough that cap (9) will push against piston (13) as cap (9) is installed. Doing so will ensure piston (13) is firmly against cap (9).

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   Illustration 3	g03732864

4. Install O-ring seal (12) on end cap (11). Lubricate O-ring seal (12) with the lubricant that is being sealed.
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   Illustration 4	g03732848

5. Install accumulator (8) in a suitable device that will prevent the accumulator from rotating. Use Tooling (A) to install end cap (11) in accumulator (8) using the orientation marks established during disassembly.

   Note: Do not use air tools to tighten end cap (11).

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   Illustration 5	g03732845

6. Install O-ring seal (10) on end cap (9). Lubricate O-ring seal (10) with the lubricant that is being sealed.
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   Illustration 6	g03732759

7. Reposition accumulator (8) in order to install end cap (9). Use Tooling (A) in order to install end cap (9) using the orientation marks established during the disassembly.

   Note: As specified in Step 3 end cap (9) should make contact with the piston as it is installed. This will insure the piston is seated against end cap (9) at the start of the nitrogen charging procedure.

   Note: Do not use air tools to tighten end cap (9).

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   Illustration 7	g03732744

8. Install gas valve (3). Tighten the base of gas valve (3) in to the accumulator to a torque of 25 ± 5N·m (221 ± 44lb in). Install bracket (4) to the orientation established during the disassembly.

9. Secure accumulator (8) in an upright position with gas valve (3) facing up. Fasten Tooling (C) onto gas valve (3). Refer to Special Instruction, REHS5464, "Accumulator Discharging and Charging Procedures" for the correct charging procedure. Charge the nitrogen to the following pressure 138 kPa (20 psi).

10. With Tooling (C) still fastened to gas valve (3) release the nitrogen charge. Then charge once more to the following pressure 138 kPa (20 psi). This purging process will help eliminate any atmospheric gas remaining inside the accumulator.
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    Illustration 8	g03732735

11. Install cap (2) on gas valve (3).
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    Illustration 9	g03732728

12. Install guard (1).
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    Illustration 10	g03732750

13. Install bracket (5) on the accumulator using the orientation marks established during the disassembly. Install fitting assembly (6). Install sensor assembly (7). Tighten sensor assembly (7) to the following torque 62 ± 6 N·m (46 ± 4 lb ft).

End By:

1. Install Accumulator (Make Up).