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.
COLLECTOR RING-49 CIRCUIT IDENTIFICATION CHART (2013 EPA ENGINE)
CIRCUIT
#
COLOR WIRE
TAG #
FUNCTION CIRCUIT
#
COLOR WIRE
TAG #
FUNCTION
1 YEL 000AA BATT 25 RED 024EA PARK
SWITCH
491P/N 12261-683 REVISED: January 2015
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