62Service Manual – SC900 34 - Scrub System, Cylindrical
One Brush Not Working
If only one brush is not working, you know it is not related to the drive controller, nor the power relay (K2).
The problem is isolated between the 25 amp circuit breaker and the motor.
• Swap the two motor connectors at the scrub deck. If the same motor is inoperable, you know its the motor.
If the other motor becomes inoperable, you know it is in the wiring or the circuit breaker.
• If the problem is at the motor, inspect/replace the motor brushes. If the brushes are not worn, replace the
motor.
Both Brush Motors Not Working
• If solution ows, you can eliminate the drive
controller and K1 relay as a possible cause.
Troubleshoot the K2 relay.
– Activate the scrub system as described on
page 61.
– Check the voltage from (A) to (Batt-). If
it’s 36V, then the problem lies between the
relay and the circuit breakers, or a broken
ground at the (Batt-) lug.
– Check the voltage across the coil from (B)
to (C). If the voltage is 36V, then the relay
is defective. If the voltage is zero, trace the
Pink and Violet wires to locate a break.
• If neither solution nor optional detergent
ows, check the following:
– Check the continuity of the brush (deck
lower) switch.
– Check the function of the K1 relay.
◦ Move the Pink/Blue wire from the top
(A) terminal to the lower (C) terminal.
If the brush motors run, you can
eliminate the Drive Controller as a
cause, but you know that the relay is
not closing. (Make sure to move the wire
back.)
◦ If the brush motors did not run in the
previous step, the drive controller is the
most likely cause.
◦ If the brush motors ran in the previous
step, check the voltage between (D) and
(E). If 36 volts is present, then the relay
is faulty.
◦ If 36 volts was not present in the previous step, then it is likely that the hour meter is faulty.
B
Batt+
Batt-
A
C
K2 Relay
A
K1 Relay
B
C
D
E
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