926M, 930M and 938M Wheel Loaders Machine Systems Caterpillar

Piston Pump (Implement) - Disassemble

Usage:

938M J3R

Disassembly Procedure

Show/hide table

Table 1
Required Tools
Tool	Part Number	Part Description	Qty
A	1P-0510	Driver Group	1
B	8H-0663	Bearing Puller Gp	1

Start By:

Remove the implement piston pump.

Show/hide table




Illustration 1	g01305005

Remove bolts (1) and valve (2) .

Show/hide table




Illustration 2	g01305006

Remove gasket (3) .

Show/hide table




Illustration 3	g01305007

Show/hide table

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.

Remove adjustment screw (4), housing (5), O-ring seal (6), spring (7), spring (8), and retainer (9) .

Show/hide table




Illustration 4	g01305010

Show/hide table

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.

Remove adjustment screw (10), nut (11), housing (12), O-ring seal (13), spring (14), spring (15), retainer (17), and screw (16) .

Show/hide table




Illustration 5	g01305011

Remove spool (18) and spool (19) .

Show/hide table




Illustration 6	g01305012

Show/hide table

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.

Remove bolts (20) and pump head (21) .

Show/hide table




Illustration 7	g01305013

Remove O-ring seals (22), port plate (23), and bearing cup (24) .

Show/hide table




Illustration 8	g01305014

Remove O-ring seal (25), spring (26), and piston (27) .

Show/hide table




Illustration 9	g01305015

Remove piston (28) and bearing cone (29) .

Show/hide table




Illustration 10	g01305016

Remove shim (30) .

Show/hide table




Illustration 11	g01305018

Turn the pump housing over 180 degrees and hold the components in the pump housing. Remove pump housing (31) from bearing cone (32), swashplate (33), and rotating group (34) .

Show/hide table




Illustration 12	g01305019

Remove shaft (35) and bearing cone (32) from swashplate (33) and rotating group (34) .

Show/hide table




Illustration 13	g01305020

Use Tooling (A) and a suitable press in order to remove shaft (35) from bearing cone (32) .

Show/hide table




Illustration 14	g01305021

Remove swashplate (33) from rotating group (34) .

Show/hide table




Illustration 15	g02726717

Apply identification marks to retraction plate (36), pistons (37), and barrel (38) for assembly purposes. The pistons must be installed in the original location in retraction plate (36) and in barrel (38). All three components must be assembled to the original alignment.

Show/hide table




Illustration 16	g02726721

Remove collar bearing (39) from pins (40) and barrel (38) .

Show/hide table




Illustration 17	g02726619

Show/hide table

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 (38) in a suitable press. Use Tooling (A) in order to depress the spring that is in barrel (38). Remove retaining ring (41) that secures the spring in barrel (41). Slowly release the pressure from the spring and remove Tooling (A) from the assembly.