1. Remove the retaining ring and sprag bushing retain-
er from one end only.
2. Rotate the inner race in the free-turning direction
and pull it from the assembly. Inspect the inner race
for scoring, discoloration, wear or indentions caused
by the sprag cams. If the inner race is not complete-
ly smooth, the entire brake clutch assembly must be
replaced.
3. Using a screwdriver or a small punch and a mallet,
remove the sprag bushing from one end of the outer
race. There are four (4) cutouts, or notches on the
inside face of the bushing for this purpose. If the
inside surface of the bushing is damaged or worn, it
should be replaced.
4. Remove the sprag bearing from the outer race.
Inspect the sprag closely for abnormal wear, discol-
oration, cracks, pitting or corrosion. Check the
retainer clips between the cams for excessive wear,
as seen by broken or missing clips, or bright spots
on the outer face.
5. Remove the remaining sprag bushing and inspect,
as described in step 3.
6. Closely inspect the bore of the outer race for wear,
scratches, indentions or discoloration. Any abnor-
mality is reason for replacement. All brake clutch
parts should be thoroughly cleaned and inspected
before assembly.
BRAKE CLUTCH SERVICE
42
The polished surfaces of the races and sprag cams
MUST
be perfectly smooth to insure positive
engagement of the brake clutch. The slightest defect
may reduce the brake clutch effectiveness and
cause a loss of load control, which can result in prop-
erty damage, severe injury or death. If any compo-
nent is defective, replace the entire brake clutch
assembly.
Use of the proper gear oil inside the hoist is
CRITI-
CAL
to the function of the brake clutch assembly.
Improper gear oil or excessive additives in the oil can
cause the sprag bearing to slip against the races.
This slippage can lead to loss of load control which
can result in property damage, severe injury or
death. Refer to the oil specifications in the
"Preventive Maintenance" section of this manual,
and the latest printing of Service Bulletin 503 for fur-
ther information regarding planetary hoist gear oil.