______________________________________________________________________________
DESMI Pumping Technology A/S
11
Tagholm 1
9400 Nørresundby – Denmark
Tel: +45 96 32 81 11 Fax: +45 98 17 54 99
E-mail:
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.
Fitting bush