SCRUB SYSTEM 37Service Manual – Advenger, 2800ST, 3800ST, BR 755, BR 855
SCRUB DECK LIFT ACTUATOR ERROR CODES AND MEASUREMENTS - ADVENGER / BR 755,
855
Advenger /
BR 755, 855
Display
Error Code
ST
Service LED
Blink Code
Fault Description Troubleshooting Action
4 NA Scrub deck lift actuator overload
1. Check for improper actuator adjustment – refer to Actuator Drive
Nut Adjustment section.
2. Check for binding or frozen brush deck lift linkage and excessive
weight on brush deck.
3. Check for short circuit in brush motor and wiring. Repair or
replace.
32 NA Scrub deck lift actuator open
1. Check for disconnected actuator wiring, open in wiring, defective
actuator motor, or drift in motor current draw to less than 100mA
(call factory for instructions). Repair or replace.
Lift Actuator Nominal Current (A) Overload Current Wire Colors
M4 2.5 – 3.5 5A for > 4 seconds Blue & Orange/Black
Troubleshooting Scrub System Issues
It is unlikely that the scrub system will malfunction without generating an error code, so most issues will be found on the preceding tables. A few
more machine-specic items are listed here:
Problem Possible Cause
Advenger / BR 755, 855
Scrub deck lift actuator overload Mechanical interference between the deck and the ground.
Badly worn internal components of actuator.
ST
Brush motor overload Pin/spring location is too aggressive on the deck linkage for the oor/brush
combination.
Brush
Motor Type
Scrub
Pressure
Nominal Current (A)
+/- 3A
Overload Current (A) Wire Colors
Disc
Low
Medium
High
27
32
40
60
Red
&
Black
Cylindrical
Low
Medium
High
23
30
35
48
Red
&
Black
REV
Low
Medium
High
Does not use Target Amps for
Scrub Pressure
60
Red
&
Black
Brush
Contactor Coil
Nominal
Resistance
Nominal Current Overload Current Wire Colors
K2 120 ohms 200 mA +/- 100 mA 750 mA
Brown
&
White/Red
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