Electrical System Collector Ring
ELECTRICAL COLLECTOR RING
When troubleshooting the electrical system, always check the collector ring first to see that
the spring-loaded brushes are centered in the bands. Keep free of any foreign material.
Keep the set screws on the collector ring tight. Otherwise the wire harness may wrap up as
the machine is swung.
The cover should allow for free operation of the collector ring and the brake. If linkages
bind, erratic operation may result. Check for unrestricted operation.
COLLECTOR RING MAINTENANCE
If not revolved for some time, under some conditions, the ring will have a tendency to
collect fine silt, or salt atmosphere will cause corrosion. If this happens, the crane should
be rotated through several revolutions if possible. The cleaning action of the brushes
should clean the ring surfaces. If it does not, or it is not practical to revolve the machine, it
may be necessary to use a standard nonresidue solvent to clean the ring. Then lightly sand
the brushes and rings with a fine grade of sandpaper and dust off with compressed air.
MAINTENANCE CHECKS
On a daily basis, inspect the cylinder mounting brackets, bushings, and pins for wear,
tightness and damage. If misalignment or excessive play or wear are detected, replace the
defective pin or bushing. Check the rod eye welds for cracks and breaks.
Inspect the hydraulic cylinder rods for nicks, dents, and scoring as part of your WEEKLY
MAINTENANCE check. Also check the cylinders for leaks at the wiper seals. Repair or
replace any damaged components.
MAINTENANCE CHECK
Every TWO YEARS OR 4000 HOURS disassemble and inspect the winch components.
These include the gearing, bearings, and brake friction discs. Refer to the Service Manual
for disassembly procedures.
LUBRICATION
Lubrication for the winch is provided by weepage flow from the drive motor. Oil enters the
final drive end through the drive shaft tube in the drum. A drain line on the main drive end
cover returns excess oil to the reservoir.
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REVISED:
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