FORM NO. 56043071 CMAX
™
28/34ST / I-MAX
™
28/32C, BA 750/850ST, BA 750C - 25
SCRUB BRUSH SYSTEM
SYMPTOM THREE
Scrub Brush Auto Removal Function Does Not Work (Optional)
Note before troubleshooting: Check that the automatic remove function is selected (E) enabled. To do this go into the special program option
section (electrical system) for instructions to follow to enable or disable the brush remove function.
Special Service Note: Read the brush remove function circuit detail in the previous brush system overview section
To test: Have the key switch ON, scrub deck raised and the drive system in neutral. Next to remove the brushes simply depress the control panel
scrub OFF switch (H) for one second.
Note 2: Enter the Service Test Mode Program in the Electrical System manual section, for alternate machine troubleshooting procedures.
Part A: Scrub Brush Auto Remove Load Circuit Troubleshooting Guide
TROUBLESHOOTING GUIDE (CONTINUED)
No
Yes
Scrub brush auto
removal function
does not work
(See Figure 1).
Check circuit(*) continu-
ity across the K3 relay
motor load contact
(remove the BLU/WHT &
BLK wires before
testing). Note the K3
coil relay must be ener-
gized, scrub off button
activated (for 1 sec.).
Load circuit should test
closed momentarily.
See Part B scrub brush
auto remove control
circuit troubleshooting
Check wiring
• From the K3 relay to
battery ground (BLK)
wire.
• From the K3 relay to
K1 brush motor solenoid
(BLU/WHT) wire.
Repair or replace
defective wiring
*Alternate method to turn on remove relay. See service test mode section and follow the how to control the remove relay under the scrub off/
pressure decrease switch explanation.
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