797F and 797F XQ Off-Highway Trucks Machine Systems Caterpillar

Assembly Procedure

Note: Cleanliness is an important factor. Before the disassembly procedure, the exterior of the component should be thoroughly cleaned. This will help to prevent dirt from entering the internal mechanism.

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Illustration 1	g06220695

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Illustration 2	g01263709

1. Heat seal (9) to 150 ° C (302 ° F). Use Tooling (B) to install seal (9). Install the seal with the shoulder toward the oil end of the accumulator.

2. Repeat Step 1 for seals (10), (8), and (11) in that order.

3. Apply Tooling (D) onto the O-ring seals, wear rings, backup rings, and the piston prior to assembly.
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   Illustration 3	g06221071

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   Illustration 4	g01263707

4. Lubricate the upper area of the cylinder wall of accumulator (1) and piston assembly (3) with the lubricant that is being sealed. Use Tooling (C) to install piston assembly (3). Push piston assembly (3) in accumulator (1) with the hollow side of the piston assembly toward the gas side.

5. Install O-ring seals (6) and (5) on end caps (7) and (4).

6. Use Tooling (A) to screw end caps (4) and (7) into accumulator (1) until end caps (4) and (7) are flush with the ends of accumulator (1). Continue to screw in end caps (4) and (7) until there is enough clearance for the installation of the locking pins (not shown).

7. Insert the locking pins back through the end of the tube on the cylinder assembly. Unscrew end caps (4) and (7) until end caps (4) and (7) come into contact with the locking pins.

8. Install valve (2). Tighten valve (2) to a torque of 35.0 ± 1.5 N·m (25.8 ± 1.1 lb ft).
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   Dry nitrogen is the only gas approved for use in the accumulators. The charging of oxygen gas in an accumulator will cause an explosion. An explosion can be eliminated by using nitrogen gas cylinders with standard CGA (Compressed Gas Association, Inc.) No. 580 connectors. When nitrogen gas is ordered, make sure to order the cylinders with CGA No. 580 connectors. Do not rely on color codes or other methods of identification to tell the difference between nitrogen and oxygen cylinders. In any application, never use an adapter 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 (99.8% purity).

9. Charge the accumulator. Refer to Testing and Adjusting, "Steering Accumulator - Test and Charge".

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1. Install the accumulator.