Desmi NSLH Compact Spacer, Operation And Maintenance Instructions

Page: 9 / 21

DESMI Pumping Technology A/S
7
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
5.3
DISMANTLING SEAT
Press out the seat from behind the shaft seal cover (18).
5.4
DISMANTLING BEARING
Before dismantling bearing, remove ring lock (12). Pull shaft with coupling out of the bearing cover
and press out the bearing.
5.5
INSPECTION
When the pump has been dismantled, check the following parts for wear and damage:
- Sealing ring/impeller:
Max. clearance 0.4-0.5 mm measured in radius.
- Shaft seal/shaft seal cover: Check the seat for flatness and cracks.
Check the rubber parts for elasticity.
- Bearings: Replace in case of wear and noise.
6.
ASSEMBLING
6.1
FITTING SEALING RINGS
When fitted, the sealing ring (4) has to bear against the shoulder of the pump casing.
ø330/415
When fitted the sealing ring (27) has to bear against the shoulder of the shaft seal cover (20).
6.2
FITTING BEARING
Place the support disc (14) (grease valve ring in ø330/415 with angular ball bearings) in the
bearing cover and press the bearing into place in the bearing cover. Lead the shaft through the
bearing cover, support disc and bearing, and press the bearing into place up against the support
disc. Fit ring lock (12).
ø330/415
Fit cover under bearing (26).
6.3
FITTING WATER DEFLECTOR
ø215/265
Assemble bearing cover and shaft seal cover. Lead the water deflector (11) over the shaft until it
touches the shaft seal cover and then further 1-1.5 mm into the shaft seal cover. Do not fasten
bearing cover and electric motor until motor and coupling have been mounted and the shaft can
rotate freely without noise.
ø330/415
Lead the water deflector (11) over the shaft until it touches the cover under bearing (26) and then
further 1-1.5 mm towards the cover under bearing. Assemble bearing cover and shaft seal cover.
Do not fasten bearing cover and electric motor until motor and coupling have been mounted and
the shaft can rotate freely without noise.
6.4
FITTING SHAFT SEAL
Pay attention to the rubber type of which the shaft seal bellows has been made. Standard is
NITRILE, however EPDM may also be used. EPDM will be damaged by mineral grease. For
EPDM use soft soap or silicone grease. Before fitting the seat, clean the recess in the shaft seal
cover. Dip the outer rubber ring of the seat into soapy water or apply silicone grease. Now press
the seat into place with the fingers and check that all parts are correctly imbedded.