422E, 428E, 432E, 434E, 442E and 444E Backhoe Loaders Machine Systems Caterpillar

Removal Procedure

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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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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 work tools have been lowered to the ground, and the 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: Put identification marks on all hoses, on all hose assemblies, on all wires, and on all tube assemblies for installation purposes. Plug all hose assemblies and all tube assemblies. This helps to prevent fluid loss, and this helps to keep contaminants from entering the system.

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

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Illustration 1	g01250315

1. Place the boom on Tooling (A). Lower the stick to the ground.

2. Release the pressure in the hydraulic oil system. Refer to Disassembly and Assembly, "Hydraulic System Pressure - Release".

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Illustration 2	g01250319

3. Place suitable cribbing under the boom cylinder.

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Illustration 3	g01250320
View from the bottom left side of the stick cylinder

4. Disconnect hose assembly (1) from the head end of the stick cylinder.

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Illustration 4	g01676473

5. Disconnect clamps (2). Disconnect hose assembly (5) .

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Illustration 5	g01676474

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Illustration 6	g01676475

6. Attach a suitable lifting device to stick cylinder (7). The weight of stick cylinder (7) is approximately 91 kg (200 lb). Use Tooling (B) in order to remove retaining rings (4) and (8). Remove washers (5) and (9). Remove pin (10). Remove pin (6) from stick cylinder (7) only. Remove stick cylinder (7) .

   Note: Remove pin (6) from the head end of stick cylinder (7). Pin (6) should support the head end of the boom cylinder when stick cylinder (7) is removed.

Disassembly and Assembly Information

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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.

Illustration 7	g01676254
(S/N: DXK1-UpDXC1-Up)

(1) Lubricate the sealing lips with the fluid that is being sealed.

(2) Before assembly, apply Tooling (D) to the wiper seal groove. Lubricate the sealing lip of the wiper seal with lubricant that is being sealed.

(3) Before assembly, lubricate the threads of the nut with lubricant.

Torque for the nut ... 2200 ± 220 N·m (1620 ± 160 lb ft)

(4) Before assembly, lubricate the threads of the head with lubricant.

Torque for the head ... 600 ± 130 N·m (440 ± 95 lb ft)

Illustration 8	g01676256
(S/N: RXS1-UpSXB1-Up)

(1) Lubricate the sealing lips with the fluid that is being sealed.

(2) Before assembly, apply Tooling (D) to the wiper seal groove. Lubricate the sealing lip of the wiper seal with lubricant that is being sealed.

(3) Before assembly, lubricate the threads of the nut with lubricant.

Torque for the nut ... 2700 ± 270 N·m (1990 ± 200 lb ft)

(4) Before assembly, lubricate the threads of the head with lubricant.

Torque for the head ... 600 ± 130 N·m (440 ± 95 lb ft)

Illustration 9	g01676260
(S/N: PCR1-UpHXB1-Up)

(1) Lubricate the sealing lips with the fluid that is being sealed.

(2) Before assembly, apply Tooling (D) to the wiper seal groove. Lubricate the sealing lip of the wiper seal with lubricant that is being sealed.

(3) Before assembly, lubricate the threads of the nut with lubricant.

Torque for the nut ... 2700 ± 270 N·m (1990 ± 200 lb ft)

(4) Before assembly, lubricate the threads of the head with lubricant.

Torque for the head ... 600 ± 130 N·m (440 ± 95 lb ft)

Installation Procedure

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Illustration 10	g01676475

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Illustration 11	g01676474

Note: Use washers (5) and (9) in order to obtain a maximum gap of 4.00 mm (0.157 inch).

1. Attach a suitable lifting device to stick cylinder (7). The weight of stick cylinder (7) is approximately 91 kg (200 lb). Install stick cylinder (7). Install pins (6) and (10). Install washers (5) and (9). Use Tooling (B) in order to install retaining rings (4) and (8) .

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Illustration 12	g01676473

2. Connect hose assembly (3). Connect clamps (2) .

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Illustration 13	g01250320
View from the bottom left side of the stick cylinder

3. Connect hose assembly (1) from the head end of the stick cylinder.

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Illustration 14	g01250319

4. Remove the suitable cribbing from the boom cylinder.

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Illustration 15	g01250315

5. Remove Tooling (A) .