DESMI Pumping Technology A/S
9
Tagholm 1
9400 Nørresundby
– Dänemark
Tlf. nr.: +45 96 32 81 11
Fax +45 98 17 54 99
E-mail: [email protected]
6.4 FITTING SHAFT SEAL
Before fitting the seat, clean the recess in the shaft seal cover (bearing housing in S32-25-110N and
S50-32-135N). When fitting the seat, remove the protective coating, if any, without scratching the
lapped surface. Dip the outer rubber ring of the seat into soapy water. Now press the seat into place
with the fingers and check that all parts are correctly imbedded. 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 diameter of the slide ring rubber bellows with soapy water and push it over the
shaft. The use of a fitting bush as shown on the below assembly drawing 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 oil 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 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 a washer and a nut.
Only S32-25-110N and S50-32-135N:
Apply Loctite 243 or similar to the thread on the shaft. Screw 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.
Tighten the impeller with 60 Nm torque.
6.6 FITTING GUIDE RING AND GUIDE VANE PIECE (ONLY S32-25-110N)
Place the guide ring (35) in the recess of the bearing housing. Fit and fasten the guide vane piece on
the guide ring. Note that the flat part of the inlet neck of the guide vane piece is to face upwards, i.e.
opposite of the drain passage for the shaft seal in the bearing housing. If the shaft cannot rotate freely,
dismantle the guide vane piece again, and place a shim (34) between bearing housing and guide ring.
6.7 FITTING BEARING HOUSING AND SHAFT SEAL COVER
Place the gasket between pump casing and shaft seal cover on the shaft seal cover where it can be
held with a little grease. Lead bearing housing with shaft seal cover into place and fasten. Note that
the drain hole for the shaft seal faces downwards.
Fitting bush
