312B Excavator Machine Systems Caterpillar

Final Drive - Disassemble

Usage:

Disassembly Procedure

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Table 1
Required Tools
Tool	Part Number	Part Description	Qty
A	1P-2420	Repair Stand	1
B	9S-7338	Crossblock	1
	3H-0465	Push-Puller Plate	2
	154-9326	Spring Compressor Plate	1
	154-9323	Spacer	2
C	5P-4758	Internal Pliers	1
D	138-7575	Link Bracket	2
E	1U-5839	Puller	1
F	199-4925	Wrench ⁽¹⁾	1
	165-1670	Wrench	1
	165-1671	Reaction Shaft	1
	132-8119	Torque Wrench	1
	132-8223	110 V Power Pack	1
	132-8231	220 V Power Pack	1
G	154-9315	Thread File	1

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^( 1 )

Use this wrench for the newer shaft nut that has four slots.

Start By:

Remove the final drive. Refer to Disassembly and Assembly, "Final Drive - Remove" in this manual.

Thoroughly clean the outside of the travel motor and the final drive prior to disassembly.

Put an alignment mark across the sections of the travel motor and the final drive for assembly purposes. The parts must be reinstalled in the original locations of the parts.

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Illustration 1	g00526895

Fasten the travel motor and the final drive to Tooling (A) with the travel motor in the up position. Remove drain plugs (1) in order to drain the oil. The capacity of the final drive is 2.5 L (.66 US gal).

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Illustration 2	g00526930

Remove the bolts (2) and use the lifting strap in order to remove the travel motor from the final drive.

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Illustration 3	g00527283

Use Tooling (B) to compress the brake assembly and remove the retaining ring.

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Illustration 4	g00527299

Remove spacer ring (3) and twenty springs (4) .

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Illustration 5	g00527333
Typical example

Apply a suitable amount of air pressure in the oil passage in order to partially remove piston (5) .

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Illustration 6	g00527337

Remove piston (5) .

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Illustration 7	g00527353

Remove shaft link (6) .

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Illustration 8	g00527355

Remove brake disks (7) .

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Illustration 9	g00527404

Remove supporting ring (8) .

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Illustration 10	g00527398

Use Tooling (C) to remove snap ring (9) .

Remove seal (10) from spindle (11) .

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Illustration 11	g00527410
Typical example

Remove seals (12) from piston (5) .

Use lifting straps and Tooling (D) in order to lift the final drive off Tooling (A) .

Carefully rotate the final drive so that the planetary cover is up.

Fasten the final drive to Tooling (A) .

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Illustration 12	g00527492

Remove twelve bolts (13) that secure cover (14) to the final drive. Remove the O-ring seal from the cover.

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Illustration 13	g00527496

Remove sun gear shaft (15) from the final drive.

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Illustration 14	g00527500

Remove the first stage of planetary gear assembly (16) from the final drive.

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Illustration 15	g00527501

Use snap ring pliers to remove snap ring (17) that secures planetary gear (18) to the planetary carrier.

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Illustration 16	g00527505

Use Tooling (E) in order to remove planetary gear (18). Remove the disk from planetary carrier (19) .

Repeat Step 21 and Step 22.

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Illustration 17	g00527583

Use snap ring pliers to remove snap ring (20) from sun gear (21) .

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Illustration 18	g00527597

Remove sun gear (21) from planetary carrier (19) .

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Illustration 19	g00527606

Remove the second stage of planetary gear assembly (22) from the final drive.

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Illustration 20	g00527613

Use snap ring pliers to remove snap ring (23) from planetary gear (24) .

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Illustration 21	g00527622

Use Tooling (E) to remove planetary gear (24). Remove the disk from planetary carrier (25) .

Repeat Steps 27 and 28 for the other two planetary gears and disks.

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Illustration 22	g00527625

Use snap ring pliers to remove snap ring (26) from sun gear (27) .

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Illustration 23	g00527629

Remove sun gear (27) from planetary carrier (25) .

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Illustration 24	g00527656

Use snap ring pliers to remove snap ring (28) that secures planetary gear (29) to spindle (30) .

Use Tooling (E) to remove planetary gear (29) from spindle (30) .

Repeat Steps 32 and 33 for the other four planetary gears.

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Illustration 25	g00527840

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Illustration 26	g00528079

Remove bolt (31), tab (32) and ball (33) from spindle nut (34).
Note: Use the access hole in ring gear (35) to access bolt (31). Ring gear (35) can be rotated in order to align the access hole with bolt (31) .

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Illustration 27	g00530820

Note: The procedure for drilling will create a small amount of steel chips. Do not allow the chips to fall into bearing kit (35) .

Use a 4.76 mm (.188 inch) drill bit (41) to remove the damaged portion of threads which was caused by ball (33). This will require drilling into spindle (30) to a depth of approximately 1.5 mm (.06 inch).

Clear the steel chips from the hole. Do not allow the chips to fall into bearing kit (35) .

Repeat Steps 35 through 37 in order to remove the remaining bolt assembly.

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Illustration 28	g00527917

Install the reaction shaft from Tooling (F) on spindle (30), as shown.

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Illustration 29	g00527930

Install the socket from Tooling (F) over spindle nut (34), as shown.

Use Tooling (F) to remove spindle nut (34). The torque that is required to remove the spindle nut is approximately 1500 N·m (1100 lb ft).

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Illustration 30	g00528669

Remove bearing kit (35) from spindle (30) .
Note: It may be necessary to remove bearing kit (35) by pulling bearing kit (35) with ring gear (36) .