Operating Instructions
30
1096.0799 | VU / VH Series
10/2010
10. Pump
adjustment
Position the pump horizontally and adjust it on level
ground.
Tighten the casing bolts (563) and hexagon nuts
(920.1) crosswise.
11. Setting impeller position (non-drive side)
Loosen the hexagon head screws (901.1) on the bear-
ing cover (360.2).
Fasten the hexagon head screws (901.1) on the bear-
ing cover (360.1) until the impeller is in contact with the
inter casing (suction casing).
Start the gauge at the front (drive side) of the pump
shaft.
Loosen the hexagon head screws (901.1) on the bear-
ing cover (360.1).
Fasten the hexagon head screws (901.1) on the bear-
ing cover (360.2) until the impeller is in contact with the
inter casing (discharge casing).
Halve the determined measure X and adjust the pump
shaft/impeller by half the measure X (towards drive
side).
Fasten the pump shaft/impeller in this position by
evenly tightening the hexagon head screws (901.1) on
the bearing covers (360.1/360.2).
Verify unobstructed movement of the pump. Manually
rotate the pump shaft.
12. Pipe
assembly
Not applicable to VU 300
Put the seals (400) and pipes (700) onto the suction-
flange/the discharge flange, fasten them with hexagon
head screws (901) and hexagon nuts (920).
7.5.13 Assembly of VU 351/451
Cross-sectional drawing VU 351/451
Cross-sectional
drawing, page 58
1.
Installation of valve flaps
Put the stop plate (598/598.1) and the flap valve (746)
onto the inter casings (137/137.1).
Screw the hexagon head screws (901.2) with screw
locking (Loctite®) into the inter casings.
2.
Installation of inter casings on suction/discharge casing
Press-fit the cylindrical pin (562) into the suc-
tion/discharge casing (106/107).
Adjust the inter casing (137) (cylindrical pin) and force
it into the suction casing (106).
Adjust the inter casing (137.1) (cylindrical pin) and
force it into the discharge casing (107).
Insert the hexagon socket head screws (914) through
the suction/discharge casing, screw them into the inter
casings and tighten them.
3.
Installation of impeller and pump shaft
Position the fitting key (940) in the middle of the pump
shaft (211).
Push the lock washer (931.1 - opposite the drive side)
onto the pump shaft.
Screw the impeller nut (922) onto the pump shaft.
Vertically clamp the pump shaft between the protective
jaws of a bench vice with the drive side pointing up.
Push the impeller (230 - at the drive side) onto the
pump shaft.
The impeller blades must be tilted in the direction of rotation
of the pump.
Push the lock washer (931.1) at the drive side onto the
pump shaft.
Screw the impeller nut (922) onto the pump shaft.
Set the impeller in accordance with adjustment dimen-
sion L by turning the impeller nuts.
Following the setting process (check adjustment di-
mension), tighten the impeller nuts and secure them
with the lock washers.
4.
Installation of stage casing and pump shaft
Horizontally clamp the discharge casing (107) (inter
casing on top).
Insert the complete pump shaft (drive side pointing up)
into the discharge casing (107), put down on inter cas-
ing (137.1).
Force the stage casing (110) into the inter casing
(137.1). The short marking on the stage casing must
point to the discharge casing. Position the stage casing
and the discharge casing in a way which ensures that
the markings are aligned with each other.
5.
Installation of suction casing
Adjust the suction casing (106) (marks) and force it
onto the stage casing (110).
Secure the casing bolts (563) in the suction/discharge
casing and slightly tighten them with hexagon nuts
(920).
6.
Installation of mechanical seal (drive side)
Moisten the auxiliary seal of the rotating unit (047) with
lubricant (grease containing PTFE).
Push the rotating unit (047) onto the shaft (211) by a
screwing movement in the sense of winding of the
spring.
Moisten the auxiliary seal of the stationary unit with lu-
bricant (alcohol, water).
Push the stationary unit (047) into the shaft sealing
casing (411).
Adjust the shaft sealing casing (441) (marking pointing
up), force it into the suction casing (106) and tighten it
with hexagon head screws (901.3).
Push the splash ring (507) onto the pump shaft.
7.
Installation of bearing housing on suction casing (drive
side)
Force the bearing cover (360.1) into the bearing hous-
ing (330), adjust and fasten it to the bearing housing by
means of hexagon head screws (901.1).
Push the bearing housing over the pump shaft (211),
force it into the suction casing (106) and fasten it with
hexagon head screws (901.3) to the suction casing.
Press-fit the rolling bearing (320) into the bearing
housing.
Force the bearing cover (360.2) into the bearing hous-
ing (330), adjust it and fasten it with hexagon head
screws (901.1).
Insert the fitting key (940.1) into the pump shaft.
8.
Installation of mechanical seal (non-drive side)
Rotate the pump 180° (drive side pointing down).
Moisten the auxiliary seal of the rotating unit (047.1)
with lubricant (grease containing PTFE).
Push the rotating unit (047.1) onto the shaft (211) by a
screwing movement in the sense of winding of the
spring.
Moisten the auxiliary seal of the stationary unit with lu-
bricant (alcohol, water).
Push the stationary unit (047.1) into the shaft sealing
casing (411).
Adjust the shaft sealing casing (441) (marking pointing
up), force it into the discharge casing (106) and tighten
it with hexagon head screws (901.3).
Push the splash ring (507) onto the pump shaft.
