Caterpillar Cat 420F BACKHOE LOADER (Prefix SKR) Service Repair Manual Instant Download

Service

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Product: BACKHOE LOADER

Model: 420F BACKHOE LOADER SKR

Configuration: 420F Backhoe Loader SKR00001-UP (MACHINE) POWERED BY C4.4 Engine

Disassembly and Assembly

416F, 420F and 430F Backhoe Loaders Machine Systems

Boom - Remove and Install

SMCS - 6501-010

Removal Procedure Table 1

Required Tools

350-7768

350-7769

Electric Hydraulic Pump Gp (115V) 1

Electric Hydraulic Pump Gp (230V0 1

Start By:

a. Remove the stick.

b. Remove the stick cylinder

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.

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.

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.

Illustration 1

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1. Disconnect harness assembly (1). Disconnect clamp (2). Disconnect hose assemblies (3) and (4).

Illustration 2

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2. Remove pin (6). Place right-hand hook (5) to the side.

Illustration 3

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3. Remove clamp (7) (not shown). Loosen nut (8). Remove pin (9) and hook (11). Remove bolt (10).

4. Attach a suitable lifting device to boom cylinder (13). The weight of boom cylinder (13) is approximately 115 kg (255 lb). Remove pin (14). Remove pin (12). Remove boom cylinder (13).

5. Disconnect hose assemblies (15) that are routed to the boom.

Illustration 4

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Illustration 5

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Illustration 6

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Illustration 7

6. Remove cable strap (17). Disconnect harness assembly (16) that is routed to the boom.

Illustration 8

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Illustration 9

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7. Install pin (14) and shims (19). Install retaining ring (18). Install pin assembly (21) (not shown). Install bracket (20) in order to secure pin assembly (21).

8. Attach Tooling (A) and a suitable lifting device to boom (22). The weight of boom (22) is approximately 455 kg (1000 lb).

9. Remove bolt (23) and pin (24). Repeat for the other side.

10. Remove boom (22).

Illustration 10

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Installation Procedure

Illustration 11

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11. Use Tooling (B) in order to remove bearings (25) and (26).

Illustration 12

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Illustration 13 g02888139

12. Use Tooling (C) in order to remove bearings (27) and (28).

Illustration 14

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1. Lower the temperature of bearings (28) and (27). Use Tooling (C) in order to install bearings (27) and (28).

Illustration 15

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2. Lower the temperature of bearings (25) and (26). Use Tooling (B) in order to install bearings (25) and (26).

Illustration 16

Illustration 17

3. Attach Tooling (A) and a suitable lifting device to boom (22). The weight of boom (22) is approximately 455 kg (1000 lb). Install boom (22).

4. Install pin (24) and bolt (23). Repeat for the other side.

Illustration 18

5. Connect harness assembly (16). Install cable strap (17).

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g02888158

g02888098

Illustration 19 g02888092

6. Connect hose assemblies (15).

Illustration 20 g02888082

Illustration 21 g02888256

7. Remove retaining ring (18). Remove pin (14) and shims (19).

Note: Pin (14) was used in the installation of the boom.

8. Attach a suitable lifting device to boom cylinder (13). The weight of boom cylinder (13) is approximately 115 kg (255 lb). Install boom cylinder (13). Install pin (12). Install pin (14) into one side of boom cylinder (13).

Note: Pin (14) will be fully installed when the stick cylinder is installed.

Illustration 22

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9. Install bolt (10). Install hook (11) and pin (9). Tighten nut (8). Install clamp (7) (not shown).

Illustration 23

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10. Position hook (5). Install pin (6).

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11. Connect hose assemblies (3) and (4). Connect clamp (2). Connect harness assembly (1).

End By:

a. Install the stick cylinder.

b. Install the stick.

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All Rights Reserved.

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Sun Sep 15 22:06:26 UTC+0800 2019

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Product: BACKHOE LOADER

Model: 420F BACKHOE LOADER SKR

Configuration: 420F Backhoe Loader SKR00001-UP (MACHINE) POWERED BY C4.4 Engine

Disassembly and Assembly

416F, 420F and 430F Backhoe Loaders Machine Systems

Swing Cylinder - Remove and Install

SMCS - 5105-010

Removal Procedure

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 1

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1. Loosen bolts (1) on right side of the bracket.

2. Position the backhoe to the side, as shown.

3. Release the pressure in the hydraulic oil system.

Illustration 2

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Illustration 3

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4. Disconnect hose assemblies (2) from the head end of the swing cylinder. Repeat for the other swing cylinder.

Illustration 4

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5. Disconnect hose assemblies (3) . Repeat for the other swing cylinder.

Illustration 5

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6. Remove the retaining ring and pin (4) . Remove bolts (5) , bolts (1) , and support (6) .

Illustration 6

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7. Attach a suitable lifting device to swing cylinder (7) . The weight of swing cylinder (7) is approximately 38 kg (85 lb). Remove swing cylinder (7) . Remove any shims that may be present. Repeat for the other side.

Disassembly and Assembly Information

Table 1

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.

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.

Tooling (A) is used for the removal of bearing (2) .

(4) Before installation, apply Tooling (D) to the threads. Use Tooling (C) to tighten piston (4) . Tighten piston (4) to a torque of 1375 ± 25 N·m (1014 ± 18 lb ft). Tighten setscrew (1) to a torque of 23 ± 3 N·m (204 ± 27 lb in)

(5) Before assembly, apply Tooling (D) to the wiper seal groove. Apply Tooling (B) to the flange.

(6) Before assembly, lubricate the sealing lip with the fluid that is being sealed.

(3) Before assembly, lubricate the threads with Tooling (D) . Use Tooling (C) and Tooling (E) to tighten head (3) . Tighten head (3) to a torque of 775 ± 25 N·m (572 ± 18 lb ft).

Installation Procedure

Illustration 7 g01253392

Note: There should be no grease applied to the cylinder body to frame joint. The joint is a nonlubricated joint that has impregnated bearings installed.

1. Attach a suitable lifting device to swing cylinder (7) . The weight of swing cylinder (7) is approximately 38 kg (85 lb). Install swing cylinder (7) and any shims that were present during the removal procedure.

2. Install bracket (6) , bolts (5) , and bolts (1) . Tighten bolts (5) and bolts (1) to a torque of 800 ± 100 N·m (590 ± 74 lb ft). Install pin (4) and the retaining ring.

Illustration 8

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Illustration 9

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Illustration 10 g02849822

3. Connect hose assemblies (3) . Repeat for the other swing cylinder.

Illustration 11

4. Connect hose assemblies (2) from the head end of the swing cylinder. Repeat for the other swing cylinder.

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Shutdown SIS

Previous Screen

Product: BACKHOE LOADER

Model: 420F BACKHOE LOADER SKR

Configuration: 420F Backhoe Loader SKR00001-UP (MACHINE) POWERED BY C4.4 Engine

Disassembly and Assembly

416F, 420F and 430F Backhoe Loaders Machine Systems

Swing Frame - Remove

SMCS - 6506-011

Removal Procedure Table 1

Required Tools