994K Wheel Loader Machine Systems Caterpillar

Removal Procedure

Start By:

1. Install the wheel chocks.

2. Connect the steering frame lock.

3. Release the hydraulic system pressure.

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Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.

Note: Install caps and plugs on all openings to prevent dirt or debris from entering the system. Cleanliness is an important factor. Before the removal procedure, thoroughly clean the exterior of the component. This will help to prevent dirt from entering the internal components.

Note: For easier assembly, mark all hose assemblies, tube assemblies, wire harnesses, and cables for identification purposes.

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When you are using hydraulic cylinders and puller studs, always ensure that the rated capacity of the puller stud meets or exceeds the rated capacity of the hydraulic cylinder. If the puller stud does not meet or exceed the rated capacity of the hydraulic cylinder, a sudden failure of the puller stud could occur. The sudden failure of the puller stud could result in personal injury or death.

1. Raise the lift arms.

Illustration 1	g06133809

Typical example.

Note: Use a suitable stand to support the lift arms.

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Retract the cylinder.

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Disassembly and assembly

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Cylinders equipped with lock valves can remain pressurized for very long periods of time, even with the hoses removed. Failure to relieve pressure before removing a lock valve or disassembling a cylinder can result in personal injury or death. Ensure all pressure is relieved before removing a lock valve or disassembling a cylinder.

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Specifications are for both the right side and for the left side.

Use Tooling (F) to complete the following procedure.

Tighten piston (5) until it stops, and then tighten an extra rotation of 13.5 degree.

Apply Tooling (E) to screw (3). Tighten screw (3) to a torque of 80 ± 8 N·m (59 ± 6 lb ft).

Tighten bolts (1) to a torque of 2918 ± 290 N·m (2152 ± 214 lb ft).

Tighten plug assembly (2) to a torque of 30 ± 3 N·m (266 ± 27 lb in).

Tighten plug (4) to torque of 35 ± 3 N·m (26 ± 2 lb ft).

Installation Procedure

1. Install the lift cylinder in the reverse order of removal.
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   Illustration 18	g06138584

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   Note: Apply Tooling (H) to the bearing sleeves and lip seals.

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   1. Tighten the nut to a torque of 1800 ± 200 N·m (1328 ± 148 lb ft). Use a suitable hammer to strike the collets until the initial torque value is reduced to less than 950 N·m (701 lb ft). Tighten nuts again to a torque of 1800 ± 200 N·m (1328 ± 148 lb ft). Use a suitable hammer to strike the collets until the torque value is reduced to less than 1600 N·m (1180 lb ft). Tighten the nuts to a final torque of 1800 ± 200 N·m (1328 ± 148 lb ft).

   2. Tighten the nuts to a torque of 1800 ± 200 N·m (1328 ± 148 lb ft) after 50 hours of operation.