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:
www.desmi.com
5.
DISMANTLING
SEE DRAWING
N
O
.
490231
Before dismantling the pump, drain the bearing bracket of oil. Unscrew stud (31) and drain the oil
into a bucket.
5.1
ACCESS
TO
IMPELLER
AND
ROTOR
Remove M12 nuts (1), which hold the bearing bracket (3) to the pump casing. Pull the bearing
bracket (3) to remove the complete bearing bracket with rotor, impeller, bearings, and shaft.
Remove the O-ring (12).
5.2
DISMANTLING
IMPELLER
AND
ROTOR
Remove impeller nut (21) and washer (37). Pull off the impeller (19). Remove Allen screws (15),
which hold the rotor housing (17) to the rear plate (14). Remove the rotor housing (17). Pull key
(20) and rotor (16) off the shaft (5). Take care not to damage the seat which is mounted in the
rotor. Remove rear plate (14) and nylon bushing (13).
5.3
DISMANTLING
SHAFT
SEAL
Pull the shaft seal off the shaft.
5.4
DISMANTLING
SEAT
Pull the shaft seal seat carefully out of the recess of the rotor hub.
5.5
DISMANTLING
SHAFT
WITH
BEARINGS
Before dismantling the shaft (5) with bearings (9-33), remove the lock ring (4) and the oil sealing
ring (8). The shaft can now be pulled out of the bearing bracket allowing inspection of the bearings.
5.6
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:
Check wear ring and seat for flatness and cracks.
Check the rubber parts for elasticity and scratches.
- Bearing:
Replace in case of wear and noise
- Rotor:
Check the rotor for damages
- Nylon bushing:
Check for wear
6.
ASSEMBLING
6.1
FITTING
SEALING
RING
IN
PUMP
CASING
When fitted, the sealing ring (22) is to bear against the shoulder of the pump casing.
6.2
FITTING
SHAFT
WITH
BEARINGS
Lead shaft with bearings into the bearing bracket. Fit oil sealing ring (8) and lock ring (4)