DESMI Pumping Technology A/S
8
Tagholm 1
9400 Nørresundby - Denmark
Tel.: +45 96 32 81 11
Fax +45 98 17 54 99
E-mail:
If it is necessary to use tools for assembling, then protect the sliding surface of the seat to prevent
it from being scratched or cut. Lubricate the inner surface of the slide ring rubber bellows with
soapy water and push it over the shaft. The use of a conical fitting bush is recommended to avoid
that the rubber bellows is cut.
Push the slide ring over the shaft with the hand. If the rubber bellows is tight, use a fitting tool and
take care that the slide ring is not damaged. If the carbon ring is not fixed, it is important to check
that it is fitted correctly, i.e. the chamfered/lapped side is to face the seat. The carbon ring can be
held by a little grease.
When using soapy water on the shaft, the bellows will settle and seat in about 15 minutes, and until
then tightness should not be expected. After start, check by viewing the leak hole in bearing
cover/shaft seal cover that there are no leaks.
6.5
FITTING
IMPELLER
Fit the sunk key in the shaft and lead the impeller towards the shoulder of the shaft. Take care that
the ring at the end of the shaft seal spring locates in the recess of the impeller. Secure the impeller
with washers (7 and 8) and a nut (ø215/265) or a set screw (ø330/415). Secure set screw (6) or
nut (6) with a removable screw locking agent, e.g. Loctite 243 or Omnifit 40M. Tighten according to
below table.
6.6
FITTING
SHAFT
SEAL
COVER
Place the O-ring (21) between pump casing and shaft seal cover in the O-ring groove and hold it
with a little grease. However, check the material of the O-ring first. As standard the material is
NITRILE, but it may be EPDM which will be damaged by mineral grease. Use soft soap or silicone
grease for EPDM. Fit and fasten shaft seal cover or motor bracket, mounted with the electric
motor, in the pump casing. Screw the pointed screws (86) back into the shaft seal cover before
tightening. Tighten the screws in the shaft seal cover according to below table. Fit copper pipe
(58).
6.7
FITTING
COUPLING
Fit sunk key (16) and motor shaft sunk key. Lead coupling part pump (70) against the shoulder of
the shaft (17) and tighten by means of pointed screw (73). Mount coupling part motor (71). Do not
tighten the pointed screw (73) into the coupling part motor until the remaining parts of the coupling
have been mounted and tightened. Mount spacer (72) by means of Allen screws (77). Secure the
screws with a removable screw locking agent.
Mount coupling discs (74) and washer (78) between spacer and coupling part motor by means of
Allen screws (76), pinch nuts (79) and Allen screws (80). Secure screws with a removable screw
locking agent. Turn the shaft a couple of times while tightening each screw slightly until coupling
discs and coupling part motor have come into place. Now tighten Allen screws and pointed screw
(73) in coupling part motor.
Check radial runout on the flanges, where the coupling plates are mounted, by means of a measuring
gauge fixed to the motor bracket - see below drawing. After tightening-up the Allen screws (76 and
80) check that the radial runout does not exceed 0.1 mm. A larger runout may result in pump
vibrations, increased bearing load and/or the impeller getting into contact with the pump sealing
ring(s).
Summary of Contents for NSLH Compact Spacer
Page 2: ......
