32
3. Place steel disc on flat surface and check for distortion
with a straight edge. Check surface for signs of ma-
terial transfer or excessive heat. Replace steel disc if
distorted, heat discolored, or mechanically damaged.
4. Check brake spring free length. Minimum free length is
1-7/16 inch (36.5 mm). Check springs for any signs of
cracking or failure. If a brake spring must be replaced
for any reason, then
ALL
brake springs must be re-
placed.
Failure to replace brake springs as a set may result in
uneven brake application pressure and repeated brake
spring failure.
CAUTION
Assembly
NOTE:
See Page 22 for the quantity of brake discs, fric-
tion discs, and brake springs for each hoist model.
Measure gap between
pressure plate and
motor adapter
4. To check brake stack height, place pressure plate (Item
7) on top of brake spacer. Hold pressure plate down
firmly by hand and measure gap (in three places) be
-
tween motor adapter and pressure plate. Average gap
must measure between 0.160 inch (4 mm) maximum
and 0.080 inch (2.0 mm) minimum. If the gap exceeds
the maximum limit, there may be too many discs in
the stack-up or the discs are distorted. If the gap is
less than the minimum, there may be too few discs or
the discs are worn beyond their serviceable limit and
should be replaced. When the gap is within the mini-
mum and maximum values, remove the pressure plate
and all brake discs. Lubricate all friction discs with the
same oil to be used in the hoist. Install all brake discs
and brake plate spacer as described in steps 2 and 3.
1. Place the motor adapter on a clean work surface with
the motor-mounting surface down. Apply a light coat of
oil to a new backup ring (Item 12) and O-ring (Item 11)
and install them into the groove on the motor adapter.
Backup rings are always placed on the low pressure
side of the O-ring. In this case, the backup ring is to-
ward the motor-mounting surface. Lightly oil the brake
cylinder seal (Item 5) and install it onto the motor adapt-
er with the seal lip down.
2. Install a steel brake disc (Item 3) into the motor adapter,
followed by a friction disc (Item 4). Continue to alter-
nately install steel and friction discs. A steel disc will be
on top.
3. Install the brake plate spacer (Item 8) on top of the last
steel disc.
Backup Ring
Seal
O-ring
