PM820, PM822, and PM825 Cold Planer Machine Systems Caterpillar

Piston Motor (Hydraulic Fan) - Disassemble

Usage:

Disassembly Procedure

Show/hide table

Table 1
Required Tools
Tool	Part Number	Part Description	Qty
A	437-3776	Fixture As.	1
	1U-5750	Engine Stand	1
	1U-9127	Adapter As	1
B	-	M5 x 80 x 90mm. Threaded Rod	1
	133-1645	Plastic Washer	1
	4E-2854	Washer	1
	5C-2847	Nut	1
C	6V-3009	Crossbar	1
	5F-7345	Threaded Rod	1
	126-7178	Puller Leg	2
	5P-8245	Hard Washer	1
	4C-5660	Threaded Adapter	1
D	1P-1860	Bearing Puller	1

Start By:

Remove the piston motor (Hydraulic Fan).

Show/hide table




Illustration 1	g06210689

Show/hide table

Personal injury can result from parts and/or covers under spring pressure.
Spring force will be released when covers are removed.

Be prepared to hold spring loaded covers as the bolts are loosened.

Attach the piston motor to Tooling (A) or suitable fixture.
Remove bolts (1) and (2) from head assembly (3).

Remove head assembly (3) from housing (4).

Show/hide table




Illustration 2	g06210704

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 plugs (5) and (6) from head assembly (3).
Show/hide table

Illustration 3 g06210708
Remove orifice (7), spring (8), and O-ring seal (9) from plug (5).
Show/hide table

Illustration 4 g06210981

Remove O-ring seal (13), spring (12), guide (11), and spool (10) from plug (6).

Show/hide table




Illustration 5	g06210988

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 plug (14) from head assembly (3).
Show/hide table

Illustration 6 g06210995
Remove O-ring seal (15), spring (16), and guide (17) from plug (14).
Show/hide table

Illustration 7 g06211026
Remove O-ring seal (18) and control plate (19) from housing (4).
Show/hide table

Illustration 8 g06212853
Install Tooling (B) into rotating assembly (20).
Show/hide table

Illustration 9 g06211165

Show/hide table

Illustration 10 g06211168
Remove retaining ring (21) and cover (22).
Show/hide table

Illustration 11 g06211171
Remove lip seal (23) from cover (22).
Show/hide table

Illustration 12 g06211173
Remove O-ring seal (24) and washer (25).
Show/hide table

Illustration 13 g06211177
Attach Tooling (C) to housing (4), as shown.
Use Tooling (C) to remove rotating assembly (20) from housing (4). The barrel must not bind while the barrel is pulled through the housing. Do not allow the barrel to separate from the pistons during the removal procedure.
Show/hide table

Illustration 14 g06212855
Remove Tooling (B) and barrel assembly (26) from the pistons.
Show/hide table

Illustration 15 g06211190
Remove spring (28) and shim (27) from barrel assembly (26).
Show/hide table

Illustration 16 g06211196
Raise the temperature of the shaft assembly to a temperature of 120° C (248° F). Remove screws (29) from the shaft. Remove plate (30) and the pistons from the shaft.
Show/hide table

Illustration 17 g06211199
Remove center pin (31) and pistons (32) from plate (30). The piston rings are nonserviceable separately from the pistons.
Show/hide table

Illustration 18 g06211205
Remove retaining ring (34) and washer (35) from shaft (33).
Show/hide table

Illustration 19 g06211233
Use Tooling (D) and a suitable press to remove bearings (36) from shaft assembly (33).
Show/hide table

Illustration 20 g06211238
Remove plug (37) and the O-ring seal from housing (4).