PLENUM 3840748 - Caterpillar

Illustration 8 g00507887
Turn the head onto the opposite side and remove seal (12).
Illustration 9 g00507954
Install Tooling (B) against the face of the barrel assembly. Use Tooling (C) to remove bearing cone (13).
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Remove three bolts (14) that hold the cam in position.
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Illustration 12 g00508018
Remove barrel assembly (15), shaft (17) and cam (16) from the pump body as a unit. The weight of the assembly is 41 kg (90 lb).
Remove shaft (17) from the assembly.
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Place shaft (17) in a suitable press, as shown. Remove bearing cone (18).
Illustration 14 g00508053Note: Do not scratch the polished surface of the pistons. Pump efficiency will be reduced. Also, make sure that the pistons remain in the barrel assembly during removal. Each piston must be reinstalled in the same bore during assembly.
Make sure that Tooling (B) is in position against the barrel. Place the barrel assembly in a vertical position on Tooling (F).
Put identification marks on each piston and on the barrel for assembly purposes. Remove cam (16) and the pistons from barrel assembly (15).
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Remove eight bolts (20), the washers, bearings (21) and the shims from the cam.
Remove restriction plate (22) and pistons (19) from the cam.
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Remove wear plate (23) from the cam.
Illustration 17 g00508123
Illustration 18 g00508124
Personal injury can result from being struck by parts propelled by a released spring force.Make sure to wear all necessary protective equipment.Follow the recommended procedure and use all recommended tooling to release the spring force.
Place barrel assembly (15) in a suitable press, as shown. Put Tooling (B) on the face of the barrel. Put Tooling (E) between the head of the press and spacer (26).
Push down on spring (25) in order to release the spring force against snap ring (27). Use Tooling (D) to remove snap ring (27). Then, slowly release the spring force.
Remove spacer (26), spring (25) and spacer (24) from the barrel.
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Strike retainer (28) lightly with a hammer in order to remove the retainer from the pump body.
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Remove two lip seals (29) from the inside of the retainer. Remove two O-ring seals (30) from the outside of the retainer.
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Use Tooling (G) to remove bearing cup (31) from the pump body.