8. Daily Inspection and Maintenance
52
53
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FB-20 (Indoor Type)
Part Number
Part Name
1
Roller
2
Brake release bolt
3
Rubber packing
4
Manual release protection spacer
5
Seal washer
6
Stationary core
7
Electromagnetic coil
8
Stud bolt
9
Brake lining
10
Adjusting washer
11
Spring washer
12
Gap adjusting nut
13
Boss
14
Shaft-retaining C-ring
15
Fan
16
Cover
17
Fan set screw
18
Leaf spring
19
Fixed plate
20
Armature plate
21
Spring
22
Nut
23
Tap-end stud
24
Ball bearings
25
Release lever
26
Bearing cover
27
Motor shaft
28
Grommet
1
2
3
4
5
28
6
7
8
9
10
11
12
13
14
17
15
18
19 20 21 22 23 24 25 26 27
16
Ｇ
- Gap Inspection
(1) Remove the grommet [28] and cover [16].
(2) Insert a gap gauge between the stationary core [6] and the armature plate [20]
and measure the gap. Measure in 3 locations around the circumference.
(3) Adjustment is required if the gap value is near the limit.
- Gap Adjustment
(1) Remove the grommet [28] and cover [16].
(2) Insert a gap gauge between the stationary core [6] and the armature plate [20] and rotate to the right the gap adjusting nuts [12]
that are attached to ends of the stud bolts [8]. If large adjustments to the gap are not possible, decrease the number of adjusting
washers [10]. There are 3 gap adjusting nuts [12]. Adjust these in turn so that 3 positions on the circumference are uniformly at the
required gap.
(3) Turn the power on and off to check brake action.
(4) Attach the cover [16] and grommet [28].
Gap Value G (mm)
Required value
(original value)
Limit value
0.6 - 0.7
1.5
Figure 8-11
