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DISASSEMBLY
1. Place an alignment mark on the motor support and
the brake cylinder before removing the motor sup-
port. The alignment mark will aid reassembly and
ensure the position of the motor on the hoist is main-
tained. Remove the four capscrews that secure the
motor support to the brake cylinder.
2. Remove the brake discs and spacer ring followed by
the piston back-up ring, pressure plate, springs and
spring separator.
Clean and Inspect
1. Thoroughly clean and inspect all parts at this time.
Check brake piston sealing surfaces on brake cylin-
der and motor support for wear that may cause seal
leaks. Smooth small scratches with emory cloth.
Replace the cylinder if there are course scratches or
excessive wear in the seal surface. Make certain the
brake release oil port is clean. The opening of the
port must have a slight chamfer to prevent cutting
the seal. It is a good practice to smooth the edge of
the port with emory cloth.
2. Check the oil seal and bearing surfaces on the out-
side of the brake cylinder for damage, wear or rust.
Replace cylinder as required.
3. Place the friction discs on a flat surface and check
for distortion with a straight edge. The friction mate-
rial should appear even across the entire surface
with the groove pattern visible. Replace the friction
discs if the splines are worn to a point, the disc is
distorted, the friction material is worn unevenly or
the groove pattern is worn away.
4. Place the steel separator discs on a flat surface and
check for distortion with a straight edge. Check the
surface for signs of material transfer or heat.
Replace the steel separator discs if they are distort-
ed or heat discolored.
BRAKE CYLINDER SERVICE
