Desmi ESLHT/-17 W180, Operation And Maintenance Instructions

Page: 11 / 20

_______________________________________________________________________________
DESMI Pumping Technology A/S
11
www.desmi.com
Tagholm 1
9400 Nørresundby
– Denmark
Tel: +45 96 32 81 11 Fax: +45 98 17 54 99
E-mail:
desmi@desmi.com
6. ASSEMBLING
Referring to the reverse process of dismantling.
6.1
FITTING CARBON BEARING AND VORTEX BREAKER
Fit the carbon bearing (4) and vortex breaker (8) into the rear cover (7) then
tighten the
counter sunk Allen screws(9 & 48).
6.2 FITTING SHAFT WITH BEARINGS
Before fitting the oil sealing ring (11), clean the recess in the bearing house (15), then lead
the shaft with ball bearing into bearing housing and fit the bearing cover (20).
6.3
FITTING SHAFT SEAL
Before fitting the seat, clean the recess in the bearing house. When fitting the seat, remove
the protective coating 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 surface of the slide ring rubber
bellows with soapy water and push it over the shaft. The use of a conical fitting bush as
shown on the 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.
It has to be made sure the length from ELK shaft seal end to bearing house flange being
within 44 +/- 0.5mm of the nominal length as shown below.
Notice ! Never use mineral oil / fat as grease, as rubber parts as standard are in EPDM.
Notice ! Never put grease on the sliding surfaces! They must be completely dry, dust-free
and clean during the mounting procedure. Also any fingerprints shall be removed with
alcohol or another suitable solvent.
ELK shaft seals must be turned after installation ... so O-rings, springs and sliding surfaces
can slip into right placement before pressure testing. This is done by mounting the seal as
described and later turn the shaft about 10 revolutions - with water in the pump - but without
adding pressure. Then pressure test the pump as normally done.