Service Manual

Page 30
4. Install the backing plate with flat surface toward
friction disc, into the axle housing flange, aligning
the slots in the plate with the (6) dowels.
If assembly has two friction discs, refer to Figure 4.13
for sequence of discs.
2. Install a stationary disc against the piston into the
axle housing flange aligning the slots in the disc
with the (6) axle housing flange dowels.
3. Install the friction disc on the planetary sun gear
aligning the splines.
4. Install (2) more stationary discs against the first
friction disc, aligning the slots with the (6) axle
housing flange dowels.
5. Install the second friction disc on the planetary sun
gear aligning the splines.
6. Install the backing plate into the axle housing
flange with flat surface toward friction disc, aligning
the slots in the plate with the (6) dowels.
Wet Disc Brake Actuation and
Functional Test
1.
Install a fixture or the planetary ring gear against
the shim to limit piston travel.
2. Bolt this fixture into the tapped M18 holes in the
axle housing flange by using (3) M18 capscrews
with washers stacked as necessary under cap
-
screw heads.
3. Install a pressure gauge into the inlet port for accu-
rately measuring 690kPa (6.9 Bar, 100 psi).
4. Connect hydraulic pressure line with a shut off
valve using a maximum hydraulic pressure of
690kPa (6.9 Bar, 100 psi) actuation pressure.
5. Actuate the piston 5 times to 690kPa (6.9 Bar,
100 psi) checking that the piston extends freely
and returns to starting position when hydraulic
pressure is released.
6. Actuate piston again, lock in pressure and hold at
maximum 690kPa (6.9 Bar, 100 psi). The gauge
should read a limit 34kPa (0.34 Bar, 50 psi)
maximum drop after 1 minute.
7. Should the assembly not pass this test, The piston
should be removed and D-Rings inspected and the
axle housing bores checked for surface scratches,
repaired and re-assembled and the test procedure
rerun, until passing test.
Spindle and Planetary Ring Gear
Sub-Assembly
The planetary ring gear assembles between the spindle
and axle housing.
The ring gear can first be reassem-
bled onto the axle housing or onto the spindle. In either
case, the final assembly requires O-rings installed in the
grooves on both sides of the ring gear. If the planetary
ring gear was disassembled from the spindle earlier, the
following (2) assembly procedures are recommended to
reassemble the ring gear and spindle. Figure 4.14.
If this method is selected for assembly
,
CAUTION
Care should be taken not to press directly on the
spindle thr
eads as damage to these threads may
occur. Use of 3 steel bars assembled to allow the
pr
ess to push on the spindle f
lange directly and
not on the spindle threads is recommended.
1.
Apply light coat of grease to the O-Ring.
2.
Install the O-Ring into the groove on the planetary
ring gear face. Care should be taken not to twist or
damage the O-Ring during assembly.
3.
Align the capscrew holes in the ring gear when you
are pressing the ring gear into the spindle. The hole
alignment must be done prior actually pressing ring
gear into spindle.
!
Section 4
Assembly
4.14
O-RING
RING GEAR
SPINDLE
INSTALL BOLTS, NUTS AND WASHERS, FOR SAFETY
Figure 4.13
STATIONARY DISC
FRICTION DISC
BACKING PLATE
STEP SURFACE
WHEEL END ASSEMBLY
DOWEL