938G Wheel Loader and IT38G Integrated Toolcarrier Machine Systems Caterpillar

Removal Procedure

Start By:

1. Connect the steering frame lock. Refer to Disassembly and Assembly, "Steering Frame Lock - Separate and Connect".

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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.

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Personal injury can result from the sudden release of high pressure oil. Be sure the engine has been shut off for a minimum of five minutes to be sure that the accumulator pressure is zero. The accumulator is filled with dry nitrogen. Do not loosen or remove the valve or cap from the top of the accumulator. A purge screw at the bottom of the accumulator can be used to release the pressure that is left in the system.

Note: Put identification on all lines, on all hoses, on all wires, and on all tubes for installation purposes. Plug all lines, hoses, and tubes. This helps to prevent fluid loss and this helps to keep contaminants from entering the system.

Illustration 1	g00285109

Note: The solenoid valve and the manifold for the head end are located inside the front loader frame in the area, as shown.

1. Apply the parking brake.

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Illustration 2	g00277573

2. Raise the lift arms off the ground by approximately 1.5 m (5 ft). Place Tooling (A) under the lift arms, as shown.

3. Release the pressure in the hydraulic system. Refer to Disassembly and Assembly, "System Pressure - Release" for the correct procedure.

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Illustration 3	g00277575

4. Remove four nuts (1) and cover (2) .

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Illustration 4	g00277577

5. Disconnect electrical harness (6) .

6. Disconnect hose assembly (3) .

7. Remove nut (4), the washer and solenoid (5) from valve (8) .

8. Remove valve (8) from manifold (7) .

Installation Procedure

Note: For information about charging the ride control accumulator, refer to Testing and Adjusting, SENR6796, "Ride Control Accumulator - Test and Charge".

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Personal injury or death can result from improper accumulator charging. Dry nitrogen is the only gas approved for use in the accumulator. Charging the accumulator with oxygen gas will cause an explosion. This danger will not happen if nitrogen cylinders with standard CGA Compressed Gas Association, Inc.Number 580 connections are used. When ordering nitrogen gas, be sure that the cylinders are equipped with CGA Number 580 Connections. Do not use color codes or other methods of identification to tell the difference between nitrogen and oxygen cylinders. 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).

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Illustration 5	g00277577

1. Install valve (8) on manifold (7). The torque for valve (8) is 25 ± 5 N·m (18 ± 4 lb ft).

2. Install solenoid (5), the washer and nut (4) on valve (8). The torque for nut (4) is 14 ± 2 N·m (124 ± 18 lb in).

3. Connect hose assembly (3) .

4. Connect electrical harness (6) .

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Illustration 6	g00277575

5. Install cover (2) and four nuts (1) .

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Illustration 7	g00277573

6. Raise the lift arms and remove Tooling (A) .

End By: Separate the steering frame lock. Refer to Disassembly and Assembly, "Steering Frame Lock - Separate and Connect".