ZF Repair Manual: ZF25A, ZF25, ZF45A, ZF45-1
<< Previous of 78 Next >>4.5.8 Final assembly of the housing
a) Heat input side of the housing in an oven to approx.
120ëC (248 ëF).
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WARNING
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Handle heated housing only with protective gloves!
b) Insert the required shims for proper pretension
(clearance for ZF 45-1) into bearings bore under
bearing outer race.
c) Insert outer races of bearings. When the housing
has reached ambient temperature, drive outer races
of bearings down to the stop, using a copper punch.
d) Insert shafts.
e) Fill space between seal and dust lips of shaft seal
rings with a high quality bearing grease (Staburags
Kluber NBU 30).
f) Apply a thin coat of Loctite 574 on mating surface of
input side of the housing and join both housing
halves together.
g) Drive parallel pins into housing to align housing
halves, before tightening.
h) Install mounting bolts (item 2 and 3, Fig. 5-7a) and
torque them to 40 Nm (30 ft.lb.).
NOTE
There must be not measurable bearing clearance.
NOTE
ZF45-1 only.
Bearings, according to sections 5.4, 5.5 and 5.6
must have clearance.
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WARNING
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The necessary time for a complete polymerization is
5 hours: we recommend therefore to clean carefully
the mating surfaces with Loctite 7063 cleaner be-
fore applying the Loctite 518 and wait the requested
time before the spin test.
4.6. CONTROL BLOCK
4.6.1
Mounting the control block
NOTE
Piston rings (item 1, Fig. 6-1) have to be replaced, if
thickness is less than 2.39 mm (0.094in).
a) Insert key (item 2, Fig. 6-1) into groove of shaft.
b) Place new seal (item 3, Fig. 6-1) onto control block.
c) Align key and slot in rotor pump.
d) Slide control block carefully on input shaft.
e) Insert lock washers (item 4, Fig. 6-1) on socket head
bolts (item 5, Fig. 6-1) and provide screw threads
each with a drop of Loctite 243.
f) Tight control block bolts. Tightening torque:
18 Nm (14 ft.lb.).
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Repair Manual and Spare Parts List
Section 4
1
2
3
4
5
FIG. 6 - 1