d
e
f
g
h
©
Street
Crane
Co
Ltd
Page
66
of
103
Ref:
D3256
rev.
B
5.10.2
Hoist
Brake
Data
Hoist
Brake
Size
(see
model
code
section
7.3)
1
2
3
4
5
6
7
8
9
Nominal
air
gap
‘a’
(mm)
(+0.1,
‐
0.05mm)
0.3
0.3
0.3
0.3
0.3
0.4
0.4
0.4
0.4
Maximum
air
gap
‘a’
(mm)
0.45
0.75
0.75
0.75
0.75
1.0
0.6
1.0
0.6
Maximum
rotor
thickness
(mm)
10.0
10.0
10.0
10.0
11.5
13.0
16.0
16.0
16.0
Minimum
rotor
thickness
(mm)
8.3
7.5
7.5
7.5
8.0
10.0
12.4
12.0
12.4
Rotor
outside
diameter
(mm)
115
124
124
124
149
174
206
206
206
Maximum
adjustment
/
admissible
wear
(mm)
1.7
2.5
2.5
2.5
3.5
3.0
3.6
4.0
3.6
Tightening
torque
of
assembly
fixings
(Nm)
9.5
23
23
23
23
23
46
46
46
Tightening
torque
of
hand
release
lever
(Nm)
4.8
12
12
12
12
23
23
23
23
Hand
release
clearance
‘s’
(mm)
1.5
1.5
1.5
1.5
1.5
2.0
2.0
2.0
2.0
1
Before
adjusting
the
brake
or
changing
the
disc,
lower
the
bottom
block
to
a
suitable
level
(floor
or
platform)
and
allow
it
to
rest
on
a
solid
support.
Disconnect
the
power
supply
to
the
hoist
and
to
the
brake.
5.10.3
Brake
Disc
(Rotor)
Spline
Check
the
brake
disc
and
hub
for
wear
on
the
spline
teeth.
The
end
of
the
spline
can
be
viewed
from
the
end
of
the
brake
shaft.
If
the
brake
is
fitted
with
the
seal
end
cap
(8b),
this
will
have
to
be
removed
before
inspection.
For
a
more
detailed
inspection
the
brake
disc
will
have
to
be
removed.
If
the
spline
appears
replace
the
brake
disc
and/or
hub
immediately.
5.10.4
Checking
/
Adjusting
the
Air
Gap
To
inspect
the
air
gap
it
may
be
necessary
to
lift
or
remove
the
outer
brake
seal
(8a),
where
fitted.
Adjustment
of
the
hoist
brake
will
require
total
removal
of
the
outer
brake
seal.
The
air
gap
‘
a
’
(between
the
stator
(5)
and
the
armature
plate
(1))
should
be
checked
in
at
least
three
positions
around
the
circumference
of
the
brake
using
non
‐
magnetic
feeler
gauges
(see
Figure
48).
The
air
gap
should
not
exceed
the
maximum
air
gap
figure
given
in
the
above
table.
Figure
48
–
Checking
Hoist
Brake
Air
Gap
Where
adjustment
is
required,
slacken
the
assembly
screws
(7).
Adjust
the
air
gap
by
turning
the
adjustment
tubes
(14)
until
the
nominal
air
gap
‘
a
’
is
reached
(see
Figure
49).
Summary of Contents for ZX6
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