DESMI Pumping Technology A/S
8
Tagholm 1
9400 Nørresundby
– Dänemark
Tlf. nr.: +45 96 32 81 11
Fax +45 98 17 54 99
E-mail: [email protected]
Only S32-25-110N and S50-32-135N:
Remove Allen screw (22) which holds the bearing housing to the pump casing and pull the bearing
housing with impeller and guide vane piece out of the pump casing.
Then remove Allen screw (29) (only S32-25-110N), and guide vane piece and guide ring can be
dismantled from the bearing housing.
5.2 DISMANTLING SHAFT SEAL
Remove nut (6). Pull off the impeller. Remove Allen screws (19), which hold the bearing housing to
the shaft seal cover. Pull shaft seal cover and bearing housing apart, by which shaft seal and water
deflector are pulled off the shaft.
Only S32-25-110N and S50-32-135N:
Unscrew impeller. Dismantle the oil seal ring (31) by puncturing the front to permit the oil seal ring to
be pulled out with a hook. The oil seal ring cannot be used again. Dismantle the ring lock (30), and
the shaft with bearings can be pulled out of the bearing housing. At the same time, the shaft seal and
the water deflector are pulled off the shaft.
5.3 DISMANTLING SEAT
Press out the seat from behind the shaft seal cover (the bearing housing in S32-25-110N and S50-
32-135N).
5.4 DISMANTLING SHAFT WITH BEARINGS
Before dismantling the shaft with bearings, remove the sunk key (16). The shaft can now be pulled
out of the bearing housing allowing inspection of the bearings.
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.
(There is no sealing ring in S32-25-110N and S50-32-135N)
- 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.
- Non-return flap:
Check for cracks and hardness
6. ASSEMBLING
6.1 FITTING SEALING RING IN PUMP CASING
When fitted, the sealing ring is to bear against the shoulder of the pump casing.
6.2 FITTING SHAFT WITH BEARINGS
Lead shaft with bearings into the bearing housing. Fit sunk key (16). (Fit ring lock (30) and a new oil
seal ring (31) in S32-25-110N or S50-32-135N).
6.3 FITTING WATER DEFLECTOR
Assemble the bearing housing and the shaft seal cover. Lead the water deflector over the shaft until
it touches the shaft seal cover and then further 1-1.5 mm into the shaft seal cover (the bearing housing
in S32-25-110N or S50-32-135N).