986H Wheel Loader Machine Systems Caterpillar

Piston Pump (Hydraulic Fan) - Disassemble

Usage:

986H 986

Disassembly Procedure

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Table 1
Required Tools
Tool	Part Number	Part Description	Qty
A	1P-0510	Driver Gp	1
B	9S-9152	Bearing Puller	1

Start By:

Remove Piston Pump (Hydraulic fan).

Be sure that the outside of the piston pump is cleaned prior to disassembly.
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Illustration 1 g06227545
Remove bolts (1), valve group (2), and the gasket from the piston pump.
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Illustration 2 g06227552
Remove bolts (3) and head assembly (4) from pump body (5).
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Illustration 3 g02672620
Remove head assembly (4) from pump body (5).
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Illustration 4 g02672800
Remove O-ring seal (6) and control plate (7) from head assembly (4).
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Illustration 5 g02672881
Remove bearing cup (8).
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Illustration 6 g02672896
Remove O-ring seal (9).
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Illustration 7 g02672900
Remove bearing cone (10) from the shaft.
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Illustration 8 g02672902
Remove adjustment shim (11).
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Illustration 9 g02672906
Remove plug (12).
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Remove O-ring seal (13) from plug (12).
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Illustration 11 g02672912
Carefully place the pump in a horizontal position.
Remove rotating group (14).
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Illustration 12 g02672917
Remove piston assemblies (15) and the retainer from barrel assembly (16).
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Illustration 13 g02672921
Remove retaining ball (17) from barrel assembly (16).
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Illustration 14 g02672924

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Illustration 15 g02672956

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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.
Use a suitable press and Tooling (A) to compress spring (20) in barrel assembly (16).
Remove retaining ring (21) from barrel assembly (16).
Remove spring (20), guide (19), and pins (18) from barrel assembly (16).
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Illustration 16 g02672980

Remove control piston (22).

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Illustration 17	g02672983

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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.

Note: To release piston rod (23) from the swashplate, lift the swashplate a little and move the piston rod sideways.

Remove piston rod (23).
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Illustration 18 g02673016
Remove swashplate (24).
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Illustration 19 g02673039
Remove spring (25).
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Illustration 20 g02673044
Remove bearings (26).
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Illustration 21 g02673056
Remove shaft assembly (27).
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Illustration 22 g02673076
Remove retaining ring (28) and lip seal (29).
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Illustration 23 g02673116
Remove plugs (30) and the O-ring seals from pump body (5).
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Illustration 24 g02673122
Remove bearing cup (31) from pump body (5).
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Illustration 25 g06227585
Use Tooling (B) and a suitable press to remove bearing cone (32) from shaft assembly (27).