ZF Repair Manual: ZF25A, ZF25, ZF45A, ZF45-1
<< Previous of 78 Next >>ALTERNATIVELY (Fig. 4-3c)
.
Smear Loctite 574 on the outside diameter of the
input shaft seal using a roller.
.
Lubricate the inside lip with Kluber Staburags
NBU30 grease.
.
Insert the input shaft seal into input shaft (item 2)
using the appropriate bushing p/n 20.0012.01 (item
1).
.
Use mandrel p/n 20.0012.02 (item 3) to position the
input shaft seal in the correct way.
4.4.4 Mounting the breather filter
Due to the taper thread, the breather (item 1, Fig. 4-4)
need not to be coated with Loctite 574.
Tighten carefully during assembly (hand-tight).
Cheek leakage during a later test run. Retighten
slightly if it leaks.
4.5 MEASURING THE BEARING CLEARANCE/ADJUSTING THE PRETENSION
OF BEARINGS
4.5.1 General
The required pretension/play of bearings of the indivi-
dual shafts in the housing is obtained by using shims
of different thickness under the outer races of the taper
roller bearings. Shims which have been removed dur-
ing disassembly may be reused.
First adjustment must refer to bearing clearance.
ZF25A - ZF25 - ZF45A
Take out from the front cover (Fig. 5-1) at least shims of
0.2 mm (0.0079 in.) thickness from the shims packages
which were removed during disassembly.
NOTE
This step is not needed for ZF45-1 since bearings
are installed with clearance.
Adjustment values
Pretension mm (inches)
Shaft
Input
Intermediate
Output
ZF25A - ZF25
0.02-0.12
(0.001-0.005)
0.00-0.10
(0.000-0.004)
0.05-0.12
(0.002-0.005)
ZF45A
0.02-0.12
(0.001-0.005)
0.00-0.12
(0.000-0.005)
0.05-0.15
(0.002-0.006)
Clearance (only ZF45-1)
Shaft
Input
Intermediate
Output
mm
(inches)
0.00-0.05
(0.000-0.002)
0.00-0.05
(0.000-0.002)
0.00-0.05
(0.000-0.002)
22
Repair Manual and Spare Parts List
Section 4
1
FIG. 4 - 4
3
2
1
FIG. 5 - 1
1
2
3
FIG. 4 - 3c