4.5 MEASURING THE BEARING CLEARANCE/ADJUSTING THE PRETENSION
OF BEARINGS
4.5.1 General
The required pretention of bearings of the individual
shafts in the housing is obtained by using shims of dif-
ferent thickness under the outer races of the taper roller
bearings.
Shims which have been removed during disassembly
may be reused.
First adjustment must refer to bearing clearance.
Take out at least shims of 0.2 mm (0.0079 in.) thickness
from the shims packages which were removed during
disassembly.
ZF 63 IV - ZF 80 IV - ZF 80-1 IV - ZF 85 IV
Pretension
Input
Intermdial/reversal
Output
mm
0.02 - 0.12
0.00 - 0.12
0.05 - 0.15
inches
0.000787 - 0.00472 0.00 - 0.00472 0.001968 - 0.00591
4.5.2 Mounting outer races of tapered roller
bearings into housing
Heat "input" half of the housing (item 1, Fig. 5-2) in an
oven to approx. 120ëC (248ëF); insert shims (item 2)
and outer races (item 3) of bearings into the housing
(Fig. 5-2).
|
WARNING
|
Handle heated housing half only with protective
gloves!
When housing half has cooled down to ambient tem-
perature, press outer races carefully up to stop of hous-
ing half using a press.
4.5.3 Inserting gear set into housing
Finish housing mating facehalves with an oilstone or a
fine finishing file.
|
CAUTION
|
Make sure to keep any dirt out of housing.
.
Insert gears into housing
.
Mount "input" housing half (item 1, Fig. 5-3) with all
bolts, lock washers (item 2 and 3, Fig. 5-3) and par-
allel pins (item 4, Fig. 5-3).
Tightening torques of bolts: 40 Nm (30 ft. lb.)
23
Repair Manualand Spare Parts List
Section 4
1
2
4
3
FIG. 5 - 1
120
˚C
248
˚F
3
1
2
FIG. 5 - 2
4
1
2
3
FIG. 5 - 3
