36 - FORM NO. 56043071 CMAX
™
28/34ST / I-MAX
™
28/32C, BA 750/850ST, BA 750C
RECOVERY SYSTEM
Yes
No
No
No
Check the vacuum
indicator, is the light
flashing yellow
Test for 24/36 volts
at the K2 vacuum
solenoid, high current
(load) output wire
(BLU) to a battery
ground terminal
See Part B vacuum
motor control circuit
troubleshooting
guide.
Examples
•Motor shorted
•Worn carbon brushes
•Frozen motor
bearings
•Restriction to the
rotation of motor fans
Yes
Test for 24/36 volts
at the M4 vacuum
motor
Repair or replace the
M4 vacuum motor
Vacuum motor
does not work
(See Figure 1).
Yes
Repair or replace
wiring to vac motor
*The vacuum motor is
overloaded. Inspect
motor for possible
mechanical or electri-
cal high current draw.
*If the vacuum motor becomes overloaded, the scrub, vacuum and solution systems will turn off and the indicator light will flash yellow at a fast
rate (four times per second).
TROUBLESHOOTING GUIDE ELECTRICAL
Possible Symptom
1 Vacuum motor will not run (auto mode)
SYMPTOM ONE
Note: Do all testing with key switch on, scrub on switch activated (scrub deck lowered) and drive paddle activated (pushed Fwd or pulled into Rev).
Note 2: Enter the Service Test Mode Program in the Electrical System manual section, for alternate machine troubleshooting procedures.
Part A: Vacuum Motor Load Circuit Troubleshooting Guide
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