Fristam Pumps FPM 3531, English Translation Of The Original German Operating Manual, Page: 16 / 25

/ / FPM AND FSM SERIES / / /
14
Fig. 18 Removing the impeller
3. Loosen the impeller nut (28) and remove it including the O-
ring (29) :
3a. Pump type FPM
WARNING
Risk of injury when stopping the impeller by hand. Block the im-
peller (31) with a wooden wedge
(31) .
3b. Pump type FSM
WARNING
Risk of injury when stopping the impeller by hand. Block the im-
peller
(31) with a special tool (35) .
Fig. 19 Loosen the nut of the impeller
4. Remove the snap ring (30) , the impeller (31) and the fitted
key (34) from the shaft.
5. Remove the O-ring (32) including the stationary bushing
(33) .
Fig. 20 Disassembling the pump casing
6. Loosen and remove the screws and washers (36) .
7. Insert the 3 long studs into the casing; ensure they are even-
ly distributed.
Note: The studs are used to guide the casing in the lantern
during the disassembly and prevent damage to the magnetic
coupling.
8. Use forcing screws to separate the pump casing from the
lantern.
9. Dismantle the magnetic coupling (see Chapter 9.5 "Replacing
the magnetic coupling", Page 13 ).
Note: When disassembling the magnetic coupling, compliance
with the manufacturer's instructions is mandatory (see "Mag-
netic coupling operating manual") in the enclosed documents.
9.7 Checking of the Clearances
The position of the impeller is determined by the position on
the shaft.
Prerequisites
– Pump casing is permanently connected to lantern.
– Pump cover has been removed.
– Impeller is removed.
9.7.1 Measure the clearance of the Impeller pump cover /
pump type FPM
1. Use a digital depth gage to measure distance A of the sta-
tionary bushing (38) to the pump casing (37) .
Note: Before measuring distance A, the shaft must be pulled to
the front in the direction of the pump casing.
29
28 30 31 32 33
34
35
31
36