Cod. 985719 – 00 / July 2004
17
To re-lubricate it is necessary to use the same grease as that employed at the initial lubrication.
Bearing type Grease type
Y
Lithium soap grease with a mineral oil base according to DIN 51825-K3K-30
consistency NLGI 3
SNL-SYT
Lithium soap grease with a mineral oil base - consistency NLGI 2
5.2. REPLACING INSTRUCTIONS FOR BEARINGS
5.2.1. Dismantling the bearing with eccentric locking collar
1) Unscrew the grub screw of the eccentric collar
2) Rotate the locking collar in the opposite direction to the direction
of shaft rotation
3) Measure and mark the position of the bearing on the shaft
4) Suspend the shaft between the bracket and the impeller
5) Remove the bearing bracket. For AT fans, the bearing can be
dismantled avoiding this operation
6) Remove with a file, the flash on the shaft produced by the grub
screw
7) Remove the bearing from the shaft with an extractor or tapping
the inner ring of the bearing with a hammer
8) Replace the bearing and the rubber damper
5.2.2. Mounting the bearing with eccentric
locking collar
1) Put the bearing into the rubber damper. Mount the bracket around the rubber. For AT fan it is possible to insert
bearing+rubber with bracket already assembled and mounted on the sideplate, after having greased the rubber to
insert it more easily
2) Carefully clean the shaft. If the shaft is not new, make sure that dimension and finishing are correct
3) Mount the bracket with bearing on the shaft in the marked position
4) Fix the bracket on the sideplate
5) Place the eccentric locking collar on the inner ring extension and tighten it in the direction of the shaft rotation
6) Tighten the grub screw without exceeding the maximum torque
Shaft diameter Hexagon key size Suggested tightening torque Maximum tightening torque
mm mm Nm Nm
20 3 4 6
25 3 4 6
30 4 7 10
35 5 17 25
40 5 17 25
45 5 17 25
50 5 17 25
60 5 17 25
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