42
Maintenance and service guide - LSN-FLSN ZONE
2 - Ex ec
5724 en - 2020.02 / c
INSTALLATION AND MAINTENANCE – LSN-FLSN ZONE 2 – Ex ec
12 - FLSN MOTORS
12.1 - FLSN 160 and 180 motors
12.1.1 - Removing the rear bearing housing
- Remove the cover (13) once the fixing screws (27) have been
removed;
- extract the fan (7);
- withdraw the fixing screws (273) from the rear bearing
housing (6);
- using two levers or a soft hammer, release the rear bearing
housing (6), keeping the latter straight. Release the bearing
housing by sliding it on the shaft. The seal (54) follows and is
not re-usable;
- recover the pre-load washer (59) which is to be relocated in
its housing.
12.1.2 - Removing the front bearing housing
Withdraw the fixing screws (270) from the front bearing
housing;
- using a suitable lifting device, extract the rotor (3) + front
bearing housing (5) assembly, without making contact with the
winding;
- withdraw the fixing screws (40) of the front inner cover (33);
- release the key (21);
- using two levers or a soft hammer, separate the front bearing
housing (5) from the rotor (3), keeping the latter straight;
- release the bearing housing by sliding it on the shaft. The seal
(39) follows and is not re-usable.
12.1.3 - Changing the bearings
- Extract the bearings (30) and (50) using a suitable tool whilst
protecting the end of the shaft extension. Avoid making contact
with the shaft support surface;
- change the bearings (hot fitting only).
12.1.4 - Re-fitting
- Fit the bearings on the rotor shaft (do not forget the front inner
cover (33);
- slide the front bearing housing (5) over the bearing (30);
- re-fit the fixing screws (40) of the inner cover (33);
- introduce the rotor + bearing housing assembly into the stator
without making contact with the winding;
- present the bearing housings, grease nipples upwards, not
forgetting the pre load washer (59) to the rear. Slide them until
they are fully engaged;
- engage the bearing housings;
- check that the motor turns freely by hand.
FROM this point on we recommend that at every step you
check that the motor rotates freely by hand before moving
on to the next instruction.
- refit the bearing housing fixing screws (270) and (273);
- refit a new seal (54) in position using a drift;
- replace the fan (7);
- replace the cover (13) and refit the fixing screws (27);
- refit the new seal (39) in position using a drift;
- grease the front and rear bearings whilst rotating the shaft by
hand.
5
6
59
50
30
54
39
33
5
6
59
50
30
54
39
33
5
6
53
50
39
39
30
54
33
5
6
53
50
30
54
33
5
6
59
50
30
54
39
33
FLSN 160 and 180
foot-mounted (except V6)
standard bearings
FLSN 160 and 180
flange mounted (or flange and feet)
standard bearings
REAR
FRONT
FLSN 160 and 180
foot-mounted IM V6
standard bearings
REAR
FRONT
FLSN 160 and 180
flange mounted (or flange and feet)
dive-end roller bearing
REAR
FRONT
FLSN 160 and 180
foot-mounted
dive-end roller bearings
REAR
FRONT
REAR
FRONT
