HYDRAULIC AR 4647229 - Caterpillar

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Remove piston assembly (37) from barrel assembly (38).
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Remove retaining ball (39) from barrel assembly (38).
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Sudden release of spring force can cause injury.To prevent the possibility of injury, follow the procedure to relieve the spring pressure.
Note: There is spring force against retaining ring (43). When retaining ring (43) is removed, the spring force will be released. Removal of the internal components in barrel assembly (38) should be performed in a press. This is done in order to retain spring (42) and retaining ring (43).
Use a suitable press and Tooling (A) to compress the spring in barrel assembly (38).
Use Tooling (B) to remove retaining ring (43) from the barrel assembly (38).
Remove retaining ring (43), spring (42), guide (41), and pins (40) from the barrel.
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Move the swashplate up and down in order to remove control piston (44).
Illustration 29 g00670205Note: In order to release the piston rod (45) from the swashplate, lift the swashplate a little and move the piston rod sideways.
Remove piston rod (45).
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Remove swashplate (46).
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Remove spring (47).
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Remove two swashplate bearings (48).
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Remove shaft assembly (49).
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Remove retaining ring (50).
Use Tooling (A) to remove seal (51).
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Remove plugs (52) from pump body (27). Inspect the O-ring seals on the plugs. Replace the O-ring seals, if necessary.
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Remove bearing cup (53) from pump body (27).
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Use Tooling (C) and a suitable press to remove bearing cone (54) from shaft assembly (49).