Operating Instructions
26
1096.0799 | VU / VH Series
10/2010
10. Disassembly of inter casing of the suction/discharge casing
Loosen the hexagon socket head screw (914) in the
suction/discharge casing (106/107).
Remove the inter casing (137/137.1) from the suc-
tion/discharge casing (106/107).
Additional steps for VH 500/600/800/1200/1600
Separate the central inter casings (137.1/137.2)
Remove the packing gland (461) from the inter
casing (137.2).
11. Disassembly of valve flaps
Not applicable to VH 500/600/800/1200/1600
VU 600/1200/1600 inter casings (137/137.3)
VU 800 inter casing (137)
Loosen the hexagon head screws (901.4) on the inter
casing (137/137.3).
Remove the stop plate (598/598.1) and the flap valve
(746).
7.5.9 Preparations for assembly
CAUTION
Improper assembly results in pump damage!
►
Assemble the pump in accordance with the principal rules
of mechanical engineering.
►
Use original spare parts only.
►
For pump assembly, consult the corresponding cross-
sectional drawing.
►
Assemble the pump/aggregate in a clean and level assem-
bly area.
The following must be observed during assembly:
Replace the seals.
Install only clean parts.
Install only inspected and flawless parts.
Apply Molykote ® lubricant to all threads and fits (ex-
cept for sealing fits).
Provide all sealing surfaces with liquid sealing com-
pound shortly before insertion. Use, for example, Epple
33 as sealing compound.
Make sure not to enter foreign bodies or excessive
sealing compound into the pump.
All marks must be aligned with each other.
Keep the sliding surfaces of the mechanical seal free
of dirt and grease.
Observe the specified tightening torques
(
Tightening torques, page 42).
Marks are provided on the inter casings and the suc-
tion/discharge casings.
VU/VH 80 – 1600
The total air gap per stage between the front ends of the
impeller and the inter casings amounts to approx. 0.33 mm.
The total air gap must also be ensured when replacing
parts. Inter casings and impellers must be adjusted to each
other if required.
Please verify that the
spring of mechanical seal 047 is always right-handed while
that of mechanical seal 047.1 is left-handed (
refer to
Fig.19 and 20).
1
3
2
047
1 Rotating unit (047/RU)
2 Stationary unit (047/SU)
3 Right-handed spring, (view towards sealing ring)
Fig. 19 Mechanical seal of clockwise rotating shaft (view to-
wards pump)
2
3
1
047.1
1 Rotating unit (047.1/RU)
2 Stationary unit (047.1/SU)
3 Left-handed spring, (view towards sealing ring)
Fig. 20 Mechanical seal of anti-clockwise rotating shaft (view
towards motor)
7.5.10 Assembly of VU 20/40, VH 20/40/60
Cross-sectional drawing VU 20/40
Cross-sectional draw-
ing, page 57
Cross-sectional drawing VH 20/40/60
Cross-sectional drawing, page 60
Assembly preparations
Press-fit the radial seal ring (421) into the bearing
housing (330) (sealing lip opposite the bearing seat).
Apply a thin layer of grease to the sealing lip.
Press-fit the mechanical seals (047/SU) and
(047.1/SU) into the shaft sealing casings (441). Apply
lubricant (water, alcohol) to the auxiliary seal of the
stationary unit before press-fitting it. Manually force the
stationary unit into the shaft sealing casing (441).
1.
Installation of bearing housing and mechanical seal
Vertically clamp the pump shaft (211) with the drive
side pointing down.
Push the ring (500.2) onto the pump shaft (211).
Moisten the auxiliary seal of the rotating unit (047.1)
with lubricant (grease containing PTFE).
Push the rotating unit (047.1) onto the pump shaft
(211) by a screwing movement in the sense of winding
of the spring.
Adjust the shaft sealing casing (441) to the bearing
housing (330), force it into position and compress it.
Push both parts (330/441) onto the pump shaft.
Push the ring (500.1) onto the pump shaft.
Press the rolling bearing (320) onto the pump shaft
and use the locking ring (932) to fix it.
Adjust the bearing cover (360.1) to the bearing housing
(330), force it into position and fasten it by means of
hexagon head screws (901.1).
