Scrub System, Cylindrical 115Service Manual – SC6500
™
Problem Cause Correction
The scrub system
will not operate
(continued)
Right brush motor contactor
coil open (error code
26
displayed)
1. Check for an open circuit in the K2 coil and wiring
(wire colors VIO and YEL/BLU).
2. Test for 36V at the K2 coil. If you get 0 Volts,
check the A2 control board assembly.
Right brush motor contactor
coil short to ground (error
code
27 displayed)
1. Disconnect the K2 coil wiring (wire colors VIO
and YEL/BLU) and check to see if the code
disappears.
− If the code disappears, replace the brush
contactor.
− If the code does reappear, test the wiring for
a short back to the battery ground. Repair or
replace the defective wire.
2. If the above test doesn’t remove the code,
substitute a new A2 control board assembly.
The scrub deck
actuator doesn’t
raise or lower the
scrub deck
Scrub deck actuator
overload (error code
08
displayed)
• Normal current load is 1-3
amps.
• Max current load is 6
amps.
• Max current with no load
is 1.4 amps.
1. Check for binding or a frozen brush lift linkage
and excessive weight on the brush deck.
2. Check for a short circuit in the actuator motor and
wiring. Repair or replace.
To test the actuator, disconnect the motor plug
and attach the actuator power cord adapter (p/n
56407502) and perform an amp draw test. Compare
readings to the current load specications to the left.
Scrub deck actuator open
(error code
28 displayed)
1. Check for disconnected lift actuator wiring.
2. Check for an open circuit in the motor wiring or for
a defective motor.
3. Check for output voltage from the A2 control
board assembly at the actuator wiring plug. It
should be 36 volts. If 0 Volts, check the A2 control
board assembly.
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