Poly bed 4 x 2 drive system – Cub Cadet 4 x 2 Big Country - Poly Bed & Steel Bed User Manual

Page 34

Poly Bed 4 X 2 Drive System

9.20. Remove the seal from the axle tube.

NOTE: The oil seal seats against a shoulder in
the tube. Hook the seal removal tool under the
lip of the seal to avoid scratching the bore that
the seal fits in.

9.21. Technical Info. for the Curious:

See Figure 9.21.

•

The weakest part of a splined shaft is at the root
of the spline. That is the smallest cross-section
of the shaft and the root of the spline creates
stress risers.

•

The right side axle is necked-down in the middle,
to a size that is smaller than the root of the
spline.

•

The necked-down axle shaft spreads the force
over a wider area, allowing the shaft to twist over
a greater portion of its length when torque is
applied to it. This reduces the load on the weak-
est part of the shaft: the root of the spline.

9.22. Clean the axle tubes, and inspect them for:

•

Bends, cracks, or crushes.

•

Scratches or damage to mating surfaces.

9.23. Check the bearings for damage: looseness and

coarseness. Check the shafts for damage to the
splines, threads, bearing seat, and seal surface.

9.24. To remove the differential lock arm from the tran-

saxle housing, simply push it down into the bore.
See Figure 9.24.

9.25. Remove and discard the O-ring seal in the upper

groove on the differential lock arm.

NOTE: If the differential lock failed to disengage
under the pressure of the torsion return spring,
and the linkage moves freely, check the fit
between the shaft of the arm and the bore.

NOTE: Symptoms of a differential lock stuck in
the engaged position include squealing tires
when making turns at even modest speeds on
pavement, and complaints that the front end
“plows” or the ability to turn the vehicle in tight
quarters has diminished.

NOTE: Wear limits for differential lock shift
mechanism:

•

Maximum groove width is 9.2mm (.36”)

•

Minimum shift pin diameter: 8.3mm (.33”)

•

Dogs should not have rounded or broken teeth.

Figure 9.20

Seal

Shoulder for seal

Shoulder for bearing

Figure 9.21

Figure 9.24

Differential
lock arm

O-ring
seal