325B Excavator Machine Systems Caterpillar

Swing Motor - Disassemble

Usage:

Disassembly Procedure

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Table 1
Required Tools
Tool	Part Number	Part Description	Qty
(A)	9M-1974	Hard Washer	4
	1P-0074	Slide Hammer Puller	1
	5P-7970	Nut	4
	6V-3009	Crossblock	1
		⁽¹⁾ Threaded Rod	2

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⁽¹⁾	The M8 threaded rod is 254 mm (10 inch) long × 32 mm (1.25 inch) in diameter.

Start By:

Remove the swing motor. Refer to Disassembly and Assembly, "Swing Motor - Remove" in this manual.

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NOTICE

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat^® products. Dispose of all fluids according to local regulations and mandates.

Note: The following procedure is for the disassembly of a swing motor that has a swing parking brake attachment.

Make sure that the outside of the swing motor is clean and free of dirt and debris prior to disassembly.
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Illustration 1 g00515399
Place the swing motor on wood blocks, as shown. Put identification marks on each relief valve assembly (1) so that the valve's location can be identified for assembly purposes. Remove two relief valve assemblies (1).
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Illustration 2 g00515401

Remove O-ring seal (3) and backup ring (2) from each relief valve assembly.

Note: For the disassembly procedure for relief valve assemblies (1), refer to Steps 23.a through 23.m.

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Illustration 3	g00515406

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Illustration 4	g00515430

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NOTICE

Put identification marks on the components of each makeup valve as the makeup valves are removed from the valve casing of the swing motor. The components of each makeup valve must be reinstalled in the component's original location.

Remove two makeup valves (4) from the head of the swing motor. Remove plugs (7), springs (6) and valves (5). Remove O-ring seal (8) from each plug (7).
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Illustration 5 g00515433
Put an alignment mark on head (10) so that the head can be reinstalled in the head's original position on the body of the swing motor.
Remove four socket head bolts (9) and head (10) from the body of the swing motor.
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Illustration 6 g00515436
Remove O-ring seal (11) and bearing (12) from the head. If necessary, remove two pins (13) from the valve casing.
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Illustration 7 g00515444
Remove 18 springs (14) from the piston.
Remove plate (15) from the barrel assembly.
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Illustration 8 g00515494

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Illustration 9 g00515503

Note: When Tooling (A) is installed to remove piston (16), install the threaded rods into holes (X), as shown.
Mark the position of piston (16) in the body of the swing motor for assembly purposes. Install Tooling (A) in piston (16), as shown. Remove piston (16) from the body of the swing motor with Tooling (A).
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Illustration 10 g00515522
Remove four separator plates and three friction plates (17) from the piston.
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Illustration 11 g00515533

Note: During removal of barrel assembly (18) from the body of the swing motor, do not allow the components to come apart. All parts in the barrel assembly must be reinstalled in the part's original locations.
Place the swing motor on the swing motor's side, as shown. Remove barrel assembly (18) from the shaft in body (19).
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Illustration 12 g00515535

Use the following procedure to disassemble barrel assembly (18).

Put identification marks on nine piston assemblies (20) in order to mark the piston's location in plate (21) and barrel (22). Remove nine piston assemblies (20) and plate (21) from barrel (22) as a unit. Separate the piston assemblies from the plate.
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Illustration 13 g00515539
Remove bushing (23) from the barrel. Remove the spacer from the bushing.
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Illustration 14 g00515587

Note: There are 12 pins (24) in barrel (22). Two pins are used in each hole location.

Remove 12 pins (24) from the barrel.

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Illustration 15	g00515591

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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: Spacer (26) and spacer (28) are different in size. Put identification marks on the two spacers as the spacers are removed. Reinstall the spacers in the spacer's original locations.

Place barrel (22) in a press. Install a suitable size drive plate of a slightly smaller diameter than spacer (26) onto spacer (26). Apply a slight amount of compression on spacer (26) with the press. Remove retaining ring (25), and slowly release the spring compression. Remove spacer (26), spring (27) and spacer (28) from barrel (22).

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Illustration 16	g00515595

Remove O-ring seals (29) and (30) from the body.
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Illustration 17 g00515596
Remove retaining ring (31) that holds shaft assembly (32) in the body.
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Illustration 18 g00515597
Use a soft faced hammer to remove shaft assembly (32) and retainer (33) from the body. Remove the shaft assembly in the direction that is indicated by the arrow. Refer to Illustration 18.
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Illustration 19 g00515599
Remove plate (34) from the body. It may be necessary to use a hammer and a punch to remove the plate.
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Illustration 20 g00515601
Remove ring (35) and retainer (33) from the shaft.
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Illustration 21 g00515627
Remove oil seal (36) from front cover (33).
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Illustration 22 g00515633
Remove retaining ring (37) and bearing race (39) from the end of the shaft.
Remove two retaining rings (40) that position bearing (38) on the shaft.
Place the shaft in a press. Press the shaft out of bearing (38).
Use the following procedure to disassemble relief valves (1).
1. Remove plug (41).
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  Illustration 24 g00515667
2. Remove O-ring seal (42) and backup ring (43) from the plug.
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  Illustration 25 g00515676
3. Remove spring (44).
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  Illustration 26 g00515680
4. Remove seat (45).
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  Illustration 27 g00515681
5. Remove locknut (46).
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  Illustration 28 g00515683
6. Remove body (47).
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  Illustration 29 g00515686
7. Remove retainer (48).
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  Illustration 30 g00515696
8. Remove ball (49) from the larger hole of the two holes in the body.
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  Illustration 31 g00515699
9. Remove insert (50) and insert (51) from body (47).
10. Remove backup ring (52) and O-ring seal (53) from body (47).
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  Illustration 32 g00515700
11. Remove spring (54) from body (55).
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  Illustration 33 g00515702
12. Remove retainer (56) from the body.
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  Illustration 34 g00515704
13. Remove valve (57) from the body.