GSH420, GSH425, GSH440, GSH520, GSH525, GSH455 and GSH555 Orange Peel Grapples Caterpillar

Removal Procedure

Start By:

1. Release the hydraulic system pressure.

2. Remove the grapple assembly from the host machine.

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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.

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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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Illustration 1	g06248817
GSH420

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Illustration 2	g06206854
GSH520

1. Attach a suitable lifting device and crane to grapple arrangement (1). Refer to the Table 1 for the approximate weight of grapple arrangement (1) . Lower grapple arrangement (1) with closed shells to the ground. Secure grapple arrangement (1) against moving.
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   Table 1

   Approximate Weights for grapple arrangement (1).
   Model	Approximate Weight
   GSH420	1283 kg (2829 lb)
   GSH520	1305 kg (2877 lb)

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   Illustration 3	g06248828

2. Remove bolts (2), lock washers (3), and bushes (4).

3. Remove cover assembly (5).
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   Illustration 4	g06248830

4. Attach a suitable lifting device to cylinder group (6). The weight of cylinder group (6) is approximately 27 kg (60 lb).
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   Illustration 5	g06248832

5. Remove bolt (7), Lock plate (8), and pin (9).
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   Illustration 6	g06248833

6. Remove adapter (10).
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   Illustration 7	g06248835

7. Retract rod assembly (11) of cylinder group (6).
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   Illustration 8	g06248836

8. Remove bolt (13) and cover (12).
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   Illustration 9	g06248837

   Note: Put an identification mark on hose assemblies (14) for installation purpose.

9. Disconnect hose assemblies (14). Install the cap to the couplings of hose assemblies (14) to prevent oil leakage from the cylinder group.
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   Illustration 10	g06248838

10. Remove Screw (15), lock plate (16), and pin (17).
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    Illustration 11	g06248839

11. Remove adapter (18).
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    Illustration 12	g06248843

12. Remove cylinder group (6).
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    Illustration 13	g06248852

    Note: Put an identification mark on hose assemblies (18) for installation purpose.

13. Remove hose assemblies (18).

Installation Procedure

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Illustration 14	g06248852

1. Install hose assemblies (18).
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   Illustration 15	g06248843

2. Attach a suitable lifting device to cylinder group (6). The weight of cylinder group (6) is approximately 27 kg (60 lb).

3. Install cylinder group (6).
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   Illustration 16	g06248837

4. Connect hose assemblies (14).
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   Illustration 17	g06248839

5. Install adapter (18).
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   Illustration 18	g06248838

   Note: Install the pin with lubricant bore pointing towards the housing.

6. Apply Tooling (A) to the bore of pin (17). Install pin (17).

7. Apply Tooling (B) to the thread of the bolt (15).

8. Install lock washer (16) and bolt (15). Tighten bolt (15) to a torque of 270 ± 40 N·m (199 ± 30 lb ft).
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   Illustration 19	g06248835

9. Extend rod assembly (11) of cylinder group (6) to align with the pin bore.
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   Illustration 20	g06248833

10. Install adapter (10).
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    Illustration 21	g06248832

    Note: Install pin (9) with lubricant bore pointing towards the housing.

11. Apply Tooling (A) to the bore of pin (9). Install pin (9).

12. Apply Tooling (B) to the threads of bolt (7).

13. Install lock plate (8) and bolt (7). Tighten bolt (7) to a torque of 270 ± 40 N·m (199 ± 30 lb ft).
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    Illustration 22	g06248836

14. Install cover (12) and bolt (13).
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    Illustration 23	g06248828

15. Install cover assembly (5).

16. Install retainers (4), washers (3), and bolts (2).