13
TROUBLESHOOTING
The SM-Hyponic is running normally when it meets the
following criteria:
1. The motor begins to run immediately after the
start switch is moved to the ON position.
2. The unit does not make any abnormal sounds
during operation.
3. The motor stops running within about 0.5
seconds after power to the unit is switched off.
If you find any abnormality, refer to Table 20 Quick
Troubleshooting Guide on pages 14 – 15, and take the
appropriate corrective action as soon as possible.
5. Gap Adjustment
If the brake lining is so heavily worn that gap adjustment
is required, follow these steps:
a. Remove the cover (12).
b. Insert a gap gage into the space between the
stationary core (1) and the armature plate (16)
and rotate the nut (8) at the tip of the stud bolt (3)
clockwise until the gap measures an appropriate
size. If the gap is too large to adjust by this
procedure, decrease the number of adjusting
washers (4) in use. Evenly adjust the three nuts
(8) until the gaps at the three circumferential
points are equal and fall within the specification
range shown in Table 18.
c. After completing the gap adjustment, turn the
system power on and off a few times to check the
brake performance.
d. Replace the fan (14), set pin or screw (13) and
cover (12).
6. Brake Lining Replacement
Follow these steps to replace the brake lining when its
thickness has reached the allowable limit shown in Table
19, or when sleeve adjustment is no longer an effective
means of gap adjustment:
a. Remove the cover (12), set pin (13) and fan (14).
b. Remove all three nuts (8)
c. Remove the brake shoe (15) and take out the
brake lining (9).
d. Fix the leaf spring (22) as shown in Fig. 20.
e. Apply a small amount of grease along the spline
of the new brake lining (9), taking care not to
apply any to the wear surface.
f. Fit the new brake lining (9) onto the hub (10) and
check that it moves smoothly. Remove any
excess grease.
g. After reassembling the brake, measure gap G. If
the gap is out of the specification range, adjust by
rotating the gap adjusting nut (8).
h. Turn the system power on and off a few times to
check the brake performance. If no abnormalities
are detected, replace the fan (14), set pin (13)
and cover (12).
Table 19 Brake Lining Size
Brake Initial
Allowable
Brake Type lining thickness
thickness
dimension t
o
(in)
limit
t
o
(in)
FB-5B 0.394 0.237
FB-8B 0.394 0.237
Fig. 20 Leaf Spring
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