Multitech 1777.8/7-10 G3 - Manual (Page 24)

Caution
0.2 ...0.8 mm
0.2... 0.8 mm
Multitec
24
If there is no suitable torque wrench available for tightening the
shaft nuts, proceed as follows, depending on the pump version:
Self-locking nut on drive end (or non-drive end on versions
C und D)
G Tighten the shaft nut firmly
G Loosen the shaft nut again
G
Apply thread-locking agent to the thread (e.g. LOCTITE)
G Moderately tighten the shaft nut
Nut with lockwasher on drive end (or non-drive end on
versions C und D)
G Tighten the shaft nut firmly
G Loosen the shaft nut again
G Moderately tighten the shaft nut
G Bend over lockwasher
Nut with locknut on drive end (or non-drive end on versions
C und D)
G Tighten the first shaft nut firmly
G Loosen the first shaft nut again
G Moderately tighten the first shaft nut
G Block the first shaft nut with a suitable tool and tighten the
locknut firmly against the first shaft nut
Nut with locknut on non-drive end (all versions except C
and D)
G Moderately tighten the first shaft nut
G
Block the first shaft nut with a suitable tool and tighten the
locknut firmly against the first shaft nut
Fixed bearing
The fixed bearing is the coupling-side bearing at the coupling
end. Pump size 32 is equipped with deep-groove ball bearings.
The other pump sizes are fitted with angular contact ball
bearings in X arrangement (see sectional drawing).
The spacer discs 551.1 serve to position the rotor in axial
direction.
Axial adjustment of the rotor is not required. The correct axial
position of the rotor is achieved by inserting spacer discs 551.1
to a total thickness of 1.6 mm (1 x 1 mm + 3 x 0.2 mm) in bearing
housing 350.1 on the side of the bearing (or angular contact ball
bearings).
On the old versions, the rotor is axially positioned
by inserting spacer discs 551.1 on both sides of
the bearing (or angular contact ball bearings) to a total
thickness of 1.6 mm each.
Cover bolts 901.1 (or 901.8 for oil-lubricated bearings) must
be tightened in diagonally opposite sequence to the following
torques:
MTC 32/50/65 :
30 Nm
MTC 100/125/150 : 40 Nm
After installation of the bearings, the following checks shall be
made:
- Grease-lubricated bearings: Check the clearance
between cover 360.1 and bearing housing 350.1 after
having tightened bolts 901.1. There should be a clearance
between 0.2 mm and 0.8 mm. Cover 360.1 must not rest on
the bearing housing 350.1.
- Oil lubricated bearings: Check the clearance between
cover 360.2 and bearing housing 350.1 by verifying the
dimensions prior to re-assembly (if bearings or cover have
to be replaced).
Rolling element bearing sizes
Grease-lubricated bearings
Fig. 40
Pump size Fixed bearing 320.1 Radial bearing 320.2
32 6309 ZZ C3-HT 6309 ZZ C3-HT
50 2 x 7309 BUA 6309 ZZ C3-HT
65 2 x 7309 BUA 6309 ZZ C3-HT
100 2 x 7312 BUA 6312 C3
125 2 x 7312 BUA 6312 C3
150 2 x 7315 BUA 6315 C3
Oil lubricated bearings
Fig. 41
The same rolling element bearings are installed for oil
lubrication as for grease lubrication.
Exception: Instead of bearing type 6309 ZZ C3-HT, rolling
element bearing type 6309C3 is used for oil lubrication.