E-43
35 Series 4WD, Model - 3535, 4035, 4535 and 5035 SM June’08
Differential
c. BACKLASH ADJUSTMENT
The backlash for a given pair of spline shaft
(pinion gear) and bevel (ring or crown) gear is
determined at the factory and is etched on the
outer surface of the bevel gear. Adjust backlash
to the etched number ± 0.05 mm (0.002"),
preferable toward the lower limit.
NOTE: The backlash is adjusted by removing shims
from one carrier on transmission case and
fitting them to other side. The same quantity
of shims must be maintained at all time as
otherwise the “PRE-LOAD” of the tapered
roller bearing will be upset.
1. Rigidly mount a dial indicator against a gear
tooth, being sure that indicator system is
perpendicular to the tooth surface at the
extreme heels.
2. Engage two sliding gears in mesh this will held
the position quite but a pinch bar used as a
lever against one of the teeth of the gear will
ensure complete rigidity.
3. Rock the bevel gear noting total indicator
reading.
4. Repeat measurement every 90º of the bevel
gear.
5. Excessive backlash is reduced by removing
shims from the right hand bull pinion bearing
cage and assembling them to the left hand
bull pinion bearing cage and vice-versa.
A 0.005" shim transfer approximates to a
reduction or increase of 0.003" backlash.
b. THE PINION CONE CENTRE DISTANCE
1. The correct cone centre distance is etched on
the machined face of the pinion. Also etched
on this face is the set number of the pinion
and bevel gear. Ensure that the pinion and
bevel gear are matched.
NOTE: Spline shaft mounting distance is directly
etched on the bevel gear machined face
as 0.636" or any.
2. Install the spline shaft using a shim pack of
0.090" between the bearing cone and the
Transmission case.
3. Using parallel gauge block (Special Tool)
measure the distance between carrier LH
mounting axis on transmission case to bevel
pinion machined surface.
EXAMPLE:
If spline shaft mounting distance is
directly etched as 0.636" and thickness
of parallel gauge block is 0.628" then
feeler gauge of 0.008" should go. If it
is going very easily then measure the
looseness, if the feeler gauge of 0.012"
is going instead of 0.008", it means
distance between spline shaft and
transmission case is more by 0.004".
Therefore 0.004" of shims must be
of 0.004" is going instead of 0.008" then
NOTE: Measurements should be made every
90º and the average of these readings
should be taken.
4. With the correct shim pack assemble the bevel
pinion with the gears and shaft. Shims to be
assembled between head bearing of spline
shaft and bearing mounting counter bore on
transmission case.
5. Recheck the mounting distance.
During the cone center
adjustment it is imperative that backlash be present.
Preload
Ring Gear
Differential Case
Spline Shaft
4.4 - 6.6 lbs.
5.7 - 8.15 lbs.
added. Similarly if the feeler gauge
remove the shims 0.004" to increase
the distance.
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