PUMP GP-PISTON 2686691 - Caterpillar

Start By:
Remove the boom cylinder. Refer to Disassembly and Assembly, "Boom Cylinder - Remove and Install". Note: Put identification marks 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 g01233687
Disconnect hose assemblies (1) from tube assemblies (2).
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Attach Tooling (B) and a suitable lifting device to boom assembly (3). The weight of boom assembly (3) is approximately 137 kg (302 lb).
Remove bolt (5) and pin assembly (4). Remove boom assembly (3).
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Remove bolt (8) and pin assembly (7). Position swing boom cylinder (6) to the side.
Illustration 5 g01233696
Remove bolts (9) and guard (10).
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Install pin assembly (4) and bolt (5) that held the head end of the stick cylinder. Pin assembly (4) is used for the removal of support (11). Attach a suitable lifting device to pin assembly (4) and support (11). The weight of support (11) is approximately 66 kg (146 lb).
Illustration 7 g01233709
Remove bolts (13) and (14). Remove pins (12) and (15).
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Pull hose assemblies (16) and (17) out of support (11).
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Use Tooling (B) in order to remove retaining ring (18) that secures lower hitch pin (19).
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Drive upper hitch pin (20) downward onto lower hitch pin (19). Refer to Step 9. Use upper hitch pin (20) in order to drive lower hitch pin (19) out of the machine. Drive upper hitch pin (20) downward through the bore of lower hitch pin (19). Upper hitch pin (20) and lower hitch pin (19) should be removed from the bottom of the machine. Note: Note the location of each hitch pin. Upper hitch pin (20) is longer than lower hitch pin (19).
Remove support (11) from the machine. Note the location of any shims (21) that may be present.
Illustration 13 g01234191
Use Tooling (C) in order to remove bearings (22).
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Use Tooling (D) in order to remove bearings (23).