826K Landfill Compactor, 825K Soil Compactor and 824K Wheel Dozer Machine Systems Caterpillar

Piston Pump (Pilot, Brake) - Disassemble

Usage:

826K 232

Disassembly Procedure

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Table 1
Required Tools
Tool	Part Number	Part Description	Qty
A	1P-0510	Driver Gp	1
B	1P-1858	Pliers	1
C	9S-9152	Bearing Puller	1

Start By:

Remove the (Pilot, Brake) piston pump.

Be sure that the outside of the piston pump is thoroughly clean prior to disassembly.
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Illustration 1 g00670363
In order to protect the shaft seal, use an adhesive tape to cover the drive shaft.
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Illustration 2 g02672457
Remove bolts (1), valve group (2), and the gasket from the piston pump.
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Illustration 3 g02672576
Remove bolts (3) and head assembly (4) from pump body (5).
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Illustration 4 g02672620
Remove head assembly (4) from pump body (5).
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Illustration 5 g02672800
Remove O-ring seal (6) and port plate (7) from head assembly (4).
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Illustration 6 g02672881
Remove bearing cup (8).
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Illustration 7 g02672896
Remove O-ring seal (9).
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Illustration 8 g02672900
Remove bearing cone (10) from the shaft.
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Illustration 9 g02672902
Remove adjustment shim (11).
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Illustration 10 g02672906
Remove plug (12).
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Illustration 11 g02672909
Remove O-ring seal (13) from plug (12).
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Illustration 12 g02672912
Carefully place the pump in a horizontal position.
Remove rotary group (14).
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Illustration 13 g02672917
Remove piston assemblies (15) from barrel assembly (16).
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Illustration 14 g02672921
Remove retaining ball (17) from barrel assembly (16).
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Illustration 15 g02672924

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Illustration 16 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.

Note: There is spring force against retaining ring (21). When retaining ring (21) is removed, the spring force will be released. Removal of the internal components in barrel (16) should be performed in a press. This is done in order to retain spring (20) and retaining ring (21).
Use a press and Tooling (A) to compress the spring in barrel assembly (16).
Use Tooling (B) to remove retaining ring (21) from barrel assembly (16).
Remove retaining ring (21), spring (20), guide (19), and pins (18) from barrel assembly (16).
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Illustration 17 g02672980

Move the swashplate up and down in order to remove the control piston (22).

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Illustration 18	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: In order 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 19 g02673016
Remove swashplate (24).
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Illustration 20 g02673039
Remove spring (25).
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Illustration 21 g02673044
Remove bearings (26).
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Illustration 22 g02673056
Remove shaft assembly (27).
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Illustration 23 g02673076

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Illustration 24 g00670302
Remove retaining ring (28).
Use Tooling (A) to remove seal (29).
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Illustration 25 g02673116
Remove two plugs (30) from pump body (5). Inspect the O-ring seals on the plugs. Replace the O-ring seals, if necessary.
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Illustration 26 g02673122
Remove bearing cup (31) from pump body (5).
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Illustration 27 g02673158
Use Tooling (C) and a suitable press to remove bearing cone (32) from shaft assembly (27).