Desmi VAC-4001, Operation And Maintenance Instructions, Page: 8 / 15

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:
desmi@desmi.com www.desmi.com
6.3
FITTING NYLON BUSHING
Press nylon bushing (13) into place in the bearing bracket hub.
6.4
FITTING SHAFT SEAL
Before fitting the seat, clean the recess in the rotor. 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, 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.
6.5
FITTING ROTOR
Fit locating pin (18) in the rotor hub. Place rear plate (14) in the recess of the nylon bushing and
lead the rotor over the shaft and against the shoulder of the shaft. Mount the rotor housing (17) on
the rear plate (14) by means of the Allen screws (15).
6.6
FITTING IMPELLER
Fit the sunk key (9) in the shaft and lead the impeller towards the shoulder of the shaft. Take care
that the pin is placed in the hole of the impeller hub. Secure the impeller with a washer (37) and a
nut (21).
6.7
FITTING BEARING BRACKET
Place the O-ring (12) that seals between pump casing and bearing bracket on the bearing bracket
where it can be held with a little silicone grease. Lead bearing bracket into place and fasten with
nuts (1). Mount drain plug (7) and fill bearing bracket with oil (SAE 15W40) until half the shaft is
covered.
6.8
SHAFT
When the pump has been assembled, check that the shaft rotates freely.
7.
FROST PROTECTION
Pumps which are not in operation during frost periods are to be drained to avoid frost damage.
Remove the drain bolt (32) at the bottom to empty the pump. Alternatively, it is possible to use anti-
freeze liquids in normal constructions.
Fitting bush