Disassembly
1. Use a paint pen to mark the corresponding ends of
the inner race (50), outer race (42) and the over-run-
ning clutch (46). The marks will aid reassembly.
Remove one retaining ring (47) from the outer race
(42). Carefully push the inner race (50) through the
outer race (42) toward the end the retaining ring was
removed from. The inner race will bring with it the
roller bearing (44) from that end.
2. Use a non-marring brass punch and a small hammer
to carefully tap the remaining bearing (44) out of the
outer race (42). The over-running clutch (46) may be
removed from the inner race. Closely inspect the
polished surfaces of the over-running clutch cams
and the races. Check for wear, scoring, pitting or
heat discoloration. Closely inspect the roller bear-
ings for signs of damage, pitting or heat discol-
oration. If there is any imperfection in these parts,
they must be replaced.
Assembly
1. If both bearings (44) have been removed from the
outer race, install one bearing onto the inner race
(50).
2. Install the over-running clutch (46) onto the inner
race (50), be certain of the freewheel direction. The
long shoulder end of the outer race faces toward the
hydraulic motor.
3. Install the internal retaining ring (43) into the inner
race (50). Install the inner race (50) and the over-
running clutch (46) into the outer race (42) by slow-
ly rotating the inner race in the free-wheel direction
as you gently push the cams into the outer race. The
internal retaining ring should be located toward the
hoist gear train and away from the hydraulic motor.
This offset provides room for the splined motor shaft.
4. Install the remaining bearing (44) and retaining ring
(47). Make certain all retaining rings are fully seated
in the grooves. Apply a liberal amount of hoist gear
oil to the over-running brake clutch assembly before
installing into a hoist.
OVER-RUNNING CLUTCH SERVICE
i
NOTE:
Outer race (item 42), Inner race (item 50)
and Over-running clutch (item 46) are NOT SOLD
individually as replacement parts. If any of these
parts require replacement, the entire over-running
clutch assembly must be replaced. Carefully note
the relative orientation between the inner and
outer races, and the direction of free rotation of the
inner race. The clutch MUST be re-assembled
correctly for proper hoist operation.
The polished surfaces of the inner and outer race
and the over-running cams must be perfectly smooth
to insure positive engagement of the clutch. The
slightest defect may reduce clutch effectiveness,
which may lead to loss of load control and result in
property damage, injury or death. It is generally rec-
ommended to replace the entire clutch assembly if
any component is defective. For these reasons, the
over-running clutch assembly should be disassem-
bled for inspection only if the hoist has exhibited any
unusual operation that would point toward a clutch
malfunction, or the over-running clutch assembly
shows external signs of mechanical damage.
Failure to assemble the over-running clutch assem-
bly with all parts oriented correctly may result in
reduced brake effectiveness, which may lead to loss
of load control and result in property damage, injury
or death.
Input Spline Side
Inner race to rotate freely in
CW direction when viewed
from motor end.
Item
Description
Quantity
42
Outer Race
1
43
Retaining Ring
1
44
Sprag Bearing
2
46
Sprag Clutch
1
47
Retaining Ring
2
50
Inner Race
1
23
