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350
80-160
Service / Parts
Electrical System Collector Ring
ELECTRICAL COLLECTOR RING
When troubleshooting the electrical system, always check the collector ring first to see that spring
loaded brushes are centered in the bands. Keep free of any foreign material.
Keep the setscrews on the collector ring frame 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 AND SERVICE
If not revolved for some time, under some conditions, the ring will have a tendency to collect fine silt, or
a 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 ring surfaces. If it does not, or
it is not practical to revolve the machine, it may be necessary to use a standard non-residue solvent to
clean the ring. Then lightly sand the brushes and rings with a fine grade of sandpaper and dust off with
compressed air.
To replace a brush and arm assembly, remove the hex nuts and washers at the top of the brush stud
along with the outboard bearing. This will allow the brush assemblies to be removed. Carefully remove
the brushes without “over” stretching the brush springs and arrange in order of removal with spacers.
Replace the damaged brush assembly and then reassemble the brushes and spacers in reverse the
removal order. This will insure the correct spacing between electrically live parts. Be sure that all brushes
are snapped in tight and making full contact with their corresponding brass ring. Also check that all
springs are hooked correctly through the brush arm.
NOTE:
Special care should be exercised when handling or replacing the 7 1/2 Amp brush and
arm assemblies. Because of their small size, they can be broken if forced up or down. In the
correctly installed position, the possibility of breakage is minimal.
The collector ring has a nylon bearing in the base of the assembly, eliminating the need for lubrication.
If it should become necessary to remove the collector ring from the machine, do so by loosening the
socket screws at the base of the ring. This will allow the ring to be lifted off the mounting tube. When
replacing it, make sure these set screw, are again tightened. (Recommended torque 45-55 in.-lbs.) If the
set screws are not tight, the core can turn or be held by the brushes, and twist off the core leads or center
harness.