7 Servicing/Maintenance
56 of 68
Multitec A SX
Cover bolt tightening
torques
Cover bolts 901.1 (or 914.4 on oil-lubricated bearings) must be tightened crosswise to
the following torques:
Table 19:
Cover bolt tightening torques
Size
Torque
[Nm]
100
40
ü
The notes and steps stated in
(
ð
Section 7.5.1, Page 51)
to
(
ð
Section 7.5.3, Page 52)
have been observed/carried out.
1.
Apply grease to both sides of grease-lubricated bearings. (Not applicable to type
6309 and oil-lubricated bearings!)
2.
Use a press to push the rolling element bearings onto bearing sleeve 520.1 or
520.2 in "X" arrangement.
If no press is at hand, place the rolling element bearings on a soft surface and
insert the bearing sleeve into the bearing bore with a soft striking tool, taking
care not to tilt the sleeve.
3.
Place spacer discs 551.1 into bearing housing 350.1. (Total thickness of spacer
discs = 1.6 mm)
4.
Slip O-ring 412.10 onto the shaft.
5.
Slip the pre-assembled bearing assembly into bearing housing 350.1. Lift the
shaft slightly, if necessary.
6.
Secure the rolling element bearings with shaft nuts 920.2/.6/.7.
On models with two shaft nuts, firmly tighten the inner shaft nut first, then
slightly loosen it again, before locking it with the outer shaft nut.
7.
Bend lockwasher 931, if any, to engage it in the groove provided.
Final check
After installation of the bearings, check the following:
Grease-lubricated bearings
ü
Hexagon head bolts 901.1 have been tightened.
1.
Check the clearance between cover 360.1 and bearing housing 350.1.
The cover must not rest against the bearing housing.
The clearance shall measure between 0.2 mm and 0.8 mm.
Oil-lubricated bearings
1.
Check the clearance between cover 360.2 and bearing housing 350.1.
7.6 Tightening torques
7.6.1 Tie bolt tightening torques
Table 20:
Tie bolt tightening torques (in Nm)
Max. permissible pressure
[bar]
MTC material code
25
27
40
680
-
63
680
-
80
-
865
7)
Loosen again after first tightening.
8)
Final tightening torque of first nut
9)
Tightening torque of second nut (if any)
10)
Block first nut when tightening.
