Paccar Braden PD12C, Инструкция по установке, обслуживанию и ремонту

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DISASSEMBLY
1. Remove the snap ring and sprag bushing retainer from
one end only.
NOTE: The brake clutch on PD17A hoists use a
stepped inner race, which eliminates one retaining ring
and bushing retainer. The larger end of the inner race
is toward the motor.
2. Pull the inner race out. Examine the race for scoring,
wear or indentations caused by the sprag cams.
3. Use a screwdriver and mallet to remove the sprag bush-
ing from one end of the outer race. Th ere are four special
cut-outs in the bushing for this purpose. Be careful not to
damage the bushing inside surface. If a bushing’s inside
surface is damaged or shows wear, replace it.
4. Next, slide the sprag clutch out, inspect the sprag clutch
closely for abnormal wear, cracks, pitting or corrosion.
Check small clips for breakage or bright spots; the signs
of excessive wear. Unless the outer race or remaining
sprag bushing is damaged or shows excessive wear, there
is no need for further disassembly. If disassembly is nec-
essary, remove the bushing according to the procedure
covered in Step No. three (3). All brake clutch assembly
parts should be thoroughly cleaned and inspected before
assembly.
ASSEMBLY
1. Press a sprag bushing into the outer race, using a me-
chanical or hydraulic press. A fl at plate of approximately
the same diameter as the bushing fl ange outside diameter
should be placed between the press and bushing during
assembly to protect the bushing. Be certain the bushing
fl ange is against the shoulder in the outer race.
BRAKE CLUTCH SERVICE
Th e polished surfaces of the races and sprag cams must
be perfectly smooth to insure positive engagement of the
clutch. Th e slightest defect may reduce brake clutch e ff ec-
tiveness, which may lead to loss of load control and result
in property damage, personal injury or death. It is gen-
erally recommended to replace the entire brake clutch as-
sembly if any component is defective.