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en
CORRECTIVE MAINTENANCE
FFB Brake Motors Maintenance Guide
5287 en - 2015.04 / a
4.4 - Air gap adjustment
Adjust the air gap when normal loosening is no longer
possible. Always check the pad's thickness when adjusting to
ensure pad wear does not exceed the R dimension in mm (i.e.
R/2 on either side of the disc
1102
). Its change is compulsory
before
the lenght R between each brake lining reaches:
Brake size
Minimum R dimension
FFB1, FFB2, FFB3
9 mm
FFB4, FFB5
15 mm
Exceeding R dimension can cause security
problems (quick decrease of braking torque M
f
).
- Unscrew the screws
27
holding the metal cover
13
.
- Remove the metal cover
13
.
- Clear the O-ring
1107
to gain access to the air gap.
- Check the air gap between the yoke
1105
and armature
1102
in 3 points at 120°.
- Release spacers
1104
, move them closer to the yoke
1105
.
- Screw the fixing screws
1106
while measuring the air gap
between the yoke and the armature to obtain a dimension of
0.3 mm. If release lever (DLM or DMD) presence, set to 0.6
mm.
- Screw the spacers
1104
in abutment on friction face-plate
(tighten to 2 Nm ±10% torque).
- Tighten fixing screws
1106
brake yoke on face-plate to the
torque as follows: FFB1: 4.9 N.m; FFB2 and 3: 8.5 N.m; FFB4
and 5: 21 N.m ±10%.
- Check the value of the air-gap again.
- Reposition the O-ring
1107
into its groove.
- Fasten the cover
13
with its screws
27
.
When DLRA or DLM mounted, refer to §6.1, 6.2.
1102
R
lining
Summary of Contents for Leroy-Somer FFB Series
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