Rear Axle Replacement

TM 9-2320-363-34-1 · Chapter 6 — Rear Axle Maintenance

This task covers: a. Removal b. Cleaning c. Inspection d. Installation

Applicable Configuration:                           General Safety Instructions:

M915A2
                                                                    WARNING
Tools and Special Equipment:
                                                           Axle housing is heavy and can
Shop Equipment, SC 4910-95-CL-A31                          injure personnel if dropped.
Tool Kit, SC 5180-90-CL-N05                                Support axle housing during
                                                           removal or installation.
Materials/Parts:
Nut, Lock (16)              P/N N-38-P
Nut, Lock (2)
Nut, Lock (2)               P/N 30191

Personnel Required: (2)
References:

TM 9-2320-363-20
Equipment Condition:

Reference                   Condition Description
TM 9-2320-363-20            Air System Drained
TM 9-2320-363-20            Rear Brakeshoes and
                            Linings Removed
TM 9-2320-363-20            Drivelines Removed
TM 9-2320-363-20            Rear Anti-Lock Brake
                            System (ABS) Sensors
                            Removed
TM 9-2320-363-20            Axle Oil Drained

TM page 6-17

Illustration from TM 9-2320-363-34-1 (PDF page 517)

WARNING

Axle housing is heavy and can injure personnel if dropped. Support axle housing during removal.

NOTE Procedure is the same for all rear axles except where noted.

1. DISCONNECT TWO AIR LINES (1) FROM BRAKE CHAMBER (2).

NOTE Note position of spider assembly prior to removal to aid in installation.

2. REMOVE EIGHT LOCK NUTS (3), EIGHT WASHERS (4), EIGHT SCREWS (5), EIGHT WASHERS (6), AND SPIDER ASSEMBLY (7) FROM AXLE HOUSING (8). DISCARD LOCK NUTS.

3. REPEAT STEPS 1 AND 2 FOR OPPOSITE SIDE OF AXLE HOUSING (8).

TM page 6-18

Illustration from TM 9-2320-363-34-1 (PDF page 518)

NOTE If axle is to be reinstalled, tag spacers.

4. REMOVE TWO LOCK NUTS (9), TWO WASHERS (10) TWO SCREWS (11), TWO WASHERS (12), SPACER(S) (13) IF INSTALLED, AND TORQUE ROD (14). MOVE TORQUE ROD OUT OF THE WAY. DISCARD LOCK NUTS.

5. PLACE SUITABLE JACK UNDER EQUALIZING BEAM SADDLE CAP (15) AND RAISE TANDEM UNTIL COMPANION AXLES AND WHEELS ARE OFF THE GROUND. LOWER UNTIL WHEELS CANNOT BE ROTATED BY HAND.

6. REPEAT STEP 5 FOR OPPOSITE SIDE OF TANDEM.

TM page 6-19

Illustration from TM 9-2320-363-34-1 (PDF page 519)

7. USING SUITABLE ROLLER JACK, SUPPORT AXLE HOUSING (8).

8. REMOVE LOCK NUT (16), WASHER (17), SCREW (18), WASHER (19), AND TWO BUSHINGS (20). DISCARD LOCK NUT.

9. REPEAT STEP 8 FOR OPPOSITE SIDE.

10. SEPARATE AXLE HOUSING (8) FROM EQUALIZING BEAM (21) AND MOVE AXLE HOUSING (8) FROM UNDER VEHICLE.

NOTE

If axle housing is being replaced, remove differential carrier assembly in accordance with page 6-1 for forward-rear axle or page 6-12 for rear-rear axle.

Use general cleaning methods to clean all parts (page 2-30).

Inspect all parts for wear or damage.

TM page 6-20

Illustration from TM 9-2320-363-34-1 (PDF page 520)

WARNING Axle housing is heavy and can injure personnel if dropped. Support axle housing during installation. **NOTE** Procedure is the same for all rear axles except where noted. If axle housing was replaced, install differential carrier assembly in accordance with page 6-1 for forward-rear axle or page 6-12 for rear-rear axle.

1. ALINE AXLE HOUSING (1) WITH EQUALIZING BEAM END BUSHING (2) AND INSTALL TWO BUSHINGS (3), WASHER (4), SCREW (5), WASHER (6), AND NEW LOCK NUT (7). TIGHTEN SCREW TO 210-240 LB-FT (285-325 N.m).

2. REPEAT STEP 1 FOR OPPOSITE SIDE.

TM page Change 1 6-21

Illustration from TM 9-2320-363-34-1 (PDF page 521)

NOTE If reinstalling axle, perform step 3. If installing new axle, perform step 4.

3. INSTALL TORQUE ROD (8), ANY SPACER(S) (9), TWO WASHERS (10), TWO SCREWS (11), TWO WASHERS (12), AND TWO NEW LOCK NUTS (13). TIGHTEN LOCK NUTS TO 120-152 LB-FT (163-206 N.m).

4. INSTALL TORQUE ROD (8), TWO WASHERS (10), TWO SCREWS (11), TWO WASHERS (12), AND TWO NEW LOCK NUTS (13). HAND-TIGHTEN LOCK NUTS.

5. INSTALL SPIDER ASSEMBLY (14), EIGHT WASHERS (15), EIGHT SCREWS (16), EIGHT WASHERS (17), AND EIGHT NEW LOCK NUTS (18) ON AXLE HOUSING (19). TIGHTEN LOCK NUTS TO 135-145 LB-FT (183-197 N.m).

6. CONNECT TWO AIR LINES (20) IN BRAKE CHAMBER (21).

NOTE Follow-on Maintenance:

If new axle installed, adjust plane of axle (TM 9-2320-363-20). Install rear brakeshoes and linings (TM 9-2320-363-20). Fill axle with oil (TM 9-2320-363-20). Install rear Anti-Lock Brake System (ABS) sensors (TM 9-2320-363-20).

TM page 6-22 Change 1

This task covers:     a. Removal b. Cleaning   c. Inspection d. Installation

Applicable Configuration:                         Equipment Condition:

All except M915A2                                 Reference              Condition Description

Tools and Special Equipment:                      TM 9-2320-363-20       Air System Drained

Shop Equipment, SC 4910-95-C-A31                  TM 9-2320-363-20       Rear Brakeshoes and
Tool Kit, SC 5180-90-CL-N05                                              Linings Removed

Materials/Parts:                                  TM 9-2320-363-20       Drivelines Removed

Nut, Lock (32)        P/N N-38-P                  TM 9-2320-363-20       Axle Oil Drained

Nut, Lock (2)         P/N 23-09901-114            Page 9-28              Equalizing Beam
                                                                         Disconnected (All except
Nut, Lock (2)                                                            M915A2 and M916A1)

Nut, Lock (2)                                     General Safety Instructions:

Personnel Required: (2)
                                                                     WARNING
References:                                         Axle housing is heavy and can injure personnel
                                                    if dropped. Support axle housing during
                                                    removal or Installation.
TM 9-2320-363-20

TM page 6-23

Illustration from TM 9-2320-363-34-1 (PDF page 523)

WARNING

Axle housing is heavy and can injure personnel if dropped. Support axle housing during removal.

NOTE Procedure is the same for all rear axles except where noted.

1. DISCONNECT TWO AIR LINES (1) FROM BRAKE CHAMBER (2).

NOTE Note position of brake spider prior to removal to aid in installation.

2. REMOVE 16 LOCK NUTS (3), 16 WASHERS (4), 16 SCREWS (5), 16 WASHERS (6), AND SPIDER ASSEMBLY (7) FROM AXLE HOUSING (8). DISCARD LOCK NUTS.

3. REPEAT STEPS 1 AND 2 FOR OPPOSITE SIDE OF AXLE HOUSING (8).

TM page 6-24

TM 9-2320 -363-34-1

REAR AXLE REPLACEMENT (CONT)

NOTE If axle is to be reinstalled, tag spacers.

4. REMOVE TWO LOCK NUTS (9), TWO WASHERS (10), TWO SCREWS (11), TWO WASHERS (12), SPACER(S) (13) IF INSTALLED, AND TORQUE ROD (14). MOVE TORQUE ROD OUT OF THE WAY. DISCARD LOCK NUTS.

5. PLACE SUITABLE JACK UNDER EQUALIZING BEAM SADDLE CAP (15) AND RAISE TANDEM UNTIL COMPANION AXLES AND WHEELS ARE OFF THE GROUND. LOWER UNTIL WHEELS CANNOT BE ROTATED BY HAND.

6. REPEAT STEP 5 FOR OPPOSITE SIDE OF TANDEM.

TM page 6-25

Illustration from TM 9-2320-363-34-1 (PDF page 525)

7. USING SUITABLE ROLLER JACK, SUPPORT AXLE HOUSING (8).

8. REMOVE LOCK NUT (16), WASHER (17), SCREW (18), WASHER (19), AND TWO BUSHINGS (20). DISCARD LOCK NUT.

9. REPEAT STEP 8 FOR OPPOSITE SIDE.

10. SEPARATE AXLE HOUSING (8) FROM EQUALIZING BEAM (21) AND MOVE AXLE HOUSING (8) FROM UNDER VEHICLE.

NOTE

If axle housing is to be replaced, remove differential carrier assembly in accordance with page 6-1 for forward-rear axle or page 6-12 for rear-rear axle.

Use general cleaning methods to clean all parts (page 2-30).

Inspect all parts for wear or damage.

TM page 6-26

Illustration from TM 9-2320-363-34-1 (PDF page 526)

1. ALINE AXLE HOUSING (1) WITH EQUALIZING BEAM END BUSHING (2) AND INSTALL TWO BUSHINGS (3), WASHER (4), SCREW (5), WASHER (6), AND NEW LOCK NUT (7). TIGHTEN SCREW TO 445-495 LB-FT (603-671 N.m).

2. REPEAT STEP 1 FOR OPPOSITE SIDE.

TM page Change 1 6-27

Illustration from TM 9-2320-363-34-1 (PDF page 527)

NOTE If reinstalling axle, perform step 3. If installing new axle, perform step 4.

3. INSTALL TORQUE ROD (8), ANY SPACER(S) (9), TWO WASHERS (10), TWO SCREWS (11), TWO WASHERS (12), AND TWO NEW LOCK NUTS (13). TIGHTEN LOCK NUTS TO 342-434 LB-FT (464-588 N.m).

4. INSTALL TORQUE ROD (8), TWO WASHERS (10), TWO SCREWS (11), TWO WASHERS (12), AND TWO NEW LOCK NUTS (13). HAND-TIGHTEN LOCK NUTS.

5. INSTALL SPIDER ASSEMBLY (14), 16 WASHERS (15), 16 SCREWS (16), 16 WASHERS (17), AND 16 NEW LOCK NUTS (16), ON AXLE HOUSING (19). TIGHTEN LOCK NUTS TO 135-145 LB-FT (183-197 N.m).

6. CONNECT TWO AIR LINES (20) IN BRAKE CHAMBER (21).

NOTE Follow-on Maintenance:

Connect equalizing beam (all except M915A2 and M916A1) (page 9-28). If new axle was installed, adjust plane of axle (TM 9-2320-363-20). Install rear brakeshoes and linings (TM 9-2320-363-20). Fill axle with oil (TM 9-2320-363-20).

TM page 6-28 Change 1