Toro 05138SL Rev A Service Manual Groundsmaster 3280 D 3320 Preface Publication

Installation
3
1.
case, use  medium strength  Loctite thread locker  and
tighten the mounting  screws from 22 to 25  ft-lb (30 to
If the  ring gear  was removed  from the  differential
2
34
N−m).
1
2.
Apply molybdenum disulfide lubricant  (Three Bond
1901
or equivalent) to the splines and bearing surfaces
of the differential pinion gears, pinion washers and side
gears.
3.
Install the  side gear shims  and side gears  in their
original location in the differential case.
Figure 87
3.   Dial indicator
Differential gear case
1.
2.
Vise
4.
Place the differential pinion gears and pinion wash-
ers in their original location in the differential case. Tem-
porarily install the differential pinion shaft.
More than 35% total tooth contact
5.
Secure the differential case in a soft jawed vise. Posi-
tion a dial indicator on  a tooth of the differential pinion
gear. Press the pinion and side gear against the differen-
tial case and measure the pinion gear to side gear back-
lash (Fig. 87).
PINION GEAR TO SIDE GEAR BACKLASH:
1/3
from small end of tooth
to 1/2 of entire width
0.004
to 0.016 in. (0.10 to 0.40 mm)
6.
Adjust backlash by increasing or reducing side gear
Figure 88
shim thickness.
12.Install
support half.
differential gear  assembly in  right side axle
NOTE:  Side gear shims are available in 0.043 in. (1.10
mm), 0.047 in. (1.20 mm) and 0.051 in. (1.30 mm) thick-
ness.
13.Coat a  new o-ring with  grease and install  left side
axle support half. Tighten axle support case screws from
7.
Apply gear  marking compound, such  as DyKem
R
35
to 41 ft-lb (47 to 56 N−m).
Steel Blue lightly over several gear teeth.
14.Install
Shaft/Pinion Gear in this section of this manual).
input shaft/pinion  gear assembly (see  Input
8.
either pinion gear until  the side gears have made  one
complete revolution.
While applying a light load to either side gear, rotate
15.Coat new o-rings with grease, align differential shaft
splines with differential gear assembly and slide differ-
ential shaft assemblies onto axle support.
9.
Ideal tooth contact should cover  more than 35% of
each tooth surface. The  contact area should be in the
center of each tooth and extend 1/3 to  1/2 way across
each tooth from the toe (small) end (Fig. 88).
16.Install bevel  gear case/axle  case assemblies (see
Bevel Gear Case/Axle Case Assembly in this section of
this manual).
10.Adjust
side gear shims if necessary to correct tooth
contact. Recheck  differential pinion gear  to side  gear
backlash if any changes are made.
11.
After  backlash  and tooth  contact  have  been  ad-
justed, align the hole in the differential pinion shaft with
the hole in the differential case and install a new spring
pin.
Drive Axles
Page 8 − 46
Groundsmaster 3280−D/3320
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