REAR AXLE Caterpillar

Disassemble No-Spin Differential

Start By:

a. disassemble axle housing

Retaining Bolt Installation

1. Install a retaining bolt with washers and wing nut through the differential assembly, as illustrated. Note that the washers must be small enough to pass through the case ends (dimension "A"), yet large enough to restrain the two side gears against the compressed springs inside the differential (dimension "B").

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Failure to use a retaining bolt in the following steps can cause injury due to sudden release of compressed springs inside the no-spin differential

2. Make matching scribe marks on case (7) and cover (1). This will help ensure that these parts are reassembled in their original position.

3. Remove eight bolts and washers securing cover (1) to case (7). Remove the no-spin differential from inside the case.

4. Carefully remove the retaining bolt and washers while firmly holding the differential to absorb the spring force.

5. Remove side gears (2), spring retainers (3), springs (4), driven clutch assemblies (5), and spider assembly (6).

Driven Clutch Assembly
(8) Driven clutch. (9) Holdout ring.

NOTE: Driven clutch assemblies (5) consist of the driven clutch (8) and a holdout ring (9). These two parts should not be separated. If one part is damaged, the entire driven clutch assembly must be replaced.

Spider Assembly
(10) Spider. (11) Center cam.

NOTE: Spider assembly (6) consists of the spider (10) and a center cam (11). These two parts should not be separated. If one part is damaged, the entire spider assembly must be replaced.

6. Wash all parts thoroughly with a non-flammable solvent that will not etch, scratch or oxidize the parts. Rinse in clean solvent and dry.

7. Inspect the splines on the driven clutches (8). Remove any burrs or small chips. If sections of the spline are broken away, replace the parts.

8. Inspect the teeth on the driven clutches (8). If wear or chipping is present, replace the part.

9. Check holdout rings (inside driven clutch) for fractures and chipping or excessive wear of the teeth. Replace driven clutch assembly (5) if necessary.

10. Inspect the teeth on spider and center cam (inside spider). If wear or chipping is present, replace the spider assembly (6).

11. Make sure center cam moves freely inside spider assembly (6).

12. Inspect the splines on side gears (2). Remove any burrs or small chips. If splines are broken or badly chipped, or if hub walls are fractured, replace the part.

13. Check the way each side gear (2) fits on its mating axle shaft (part of the wheel end assembly). Make sure that the splines do not bind.

14. Check the spring load of the two springs (4) as follows:

a. Place one spring (4) in a spring tester.

b. Compress the spring to its operating height of 21.8 mm (.86 in.).

c. The force of the compressed spring should be 35 + 3.5 kg (77 + 7.7 lbs.).

d. Repeat steps a through c for the other spring (4).

e. If either spring load is not correct, both springs must be replaced.

15. Examine case (7) and cover (1). If worn or scored, they must be replaced.

Assemble No-Spin Differential

1. Set case (7) on a bench with the bearing end down and the inner case facing upward.

2. Place the ground hub of one side gear (2) into the bore of case (7). Make sure the side gear will rotate freely in the case.

3. Assemble one spring retainer (3) over the side gear splines with the retaining lip pointed up. It should seat against the side gear shoulder.

Spring Installation

4. Install one spring (4) over the side gear spline and against the retainer lip, with the small diameter of the spring against the retainer (3).

5. Install one driven clutch assembly (5) over the spring with the teeth up.

Compress Driven Clutch

6. Compress driven clutch assembly (5) over the side gear splines a few times. Make sure spring (4) does not bind and the coils do not overlap. See that there is good contact between the end coil and spring retainer (3) when the driven clutch and side gear splines are fully meshed.

Spider Assembly
(10) Spider. (11) Center cam. (12) Long tooth.

Driven Clutch Assembly
(8) Driven clutch. (9) Holdout ring. (13) Slot in holdout ring.

7. Position spider assembly (6) over driven clutch assembly (5). Make sure long tooth (12) of spider is positioned over slot (13) in holdout ring.

8. Position the remaining driven clutch assembly (5) over spider assembly (6). Make sure slot (13) in holdout ring is positioned over long tooth (12) in spider.

9. Assemble the remaining spring retainer (3) over the splines of the remaining side gear (2). Make sure the retaining lip is pointed up, and the spring retainer seats against the side gear shoulder.

10. Install the remaining spring (4) over the side gear spline and against the retainer lip. Make sure the small diameter of the spring is against the retainer (3).

11. Install this side gear, spring retainer, and spring assembly over driven clutch (5), with the side gear facing upward.

12. Compress side gear (2) over driven clutch (5) a few times. Make sure spring (4) does not bind and the coils do not overlap. See that there is good contact between the end coil and spring retainer (3) when the driven clutch and side gear splines are fully meshed.

13. Install cover (1) over side gear (2) and compress the springs. Make sure the side gear splines are completely meshed with the driven clutch splines.

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Hold the assembly together by hand until the bolts are installed in the following step. Failure to do so could result in injury due to sudden release of compressed springs inside the no-spin differential.

14. Hold case (7) and cover (1) firmly together with the scribe marks aligned. Install eight bolts and washers to secure the assembly.

15. Make sure there is a snug fit between case (7) and cover (1) at all points. The spider trunnions should fit tightly between the trunnion mounts in the case.

End By:

a. assemble axle housing