Recovery System
96
Service Manual – SC6500
™
Troubleshooting
If water flows around the ends of the squeegee tool instead of being pulled into the tool, the vacuum system
is not working correctly. This is usually due to either vacuum leaks, or restrictions in the squeegee tool,
vacuum hoses or float cage.
Problem
Cause
Correction
Poor water pickup
* Vacuum leak(s) due to:
• Leaky drain hose cap
• Leaky hose
• Bad gasket
• Damaged tank
• Check the drain hose cap and tighten/replace as
necessary.
• Check the squeegee and recovery tank hoses and
tighten/replace as necessary.
• Check the gaskets and replace as necessary.
• Check the recovery tank for damage.
Restrictions due to built-up
debris in the squeegee tool,
vacuum hoses or float cage
1.
Check the squeegee tool, vacuum hoses and float
cage for any accumulated dirt or debris and clean
as necessary.
2.
Check the vacuum system airflow pathway
wherever the airflow is forced to make a sharp
turn for any accumulated dirt or debris and clean
as necessary.
Vacuum motor(s)
will not run.
Vacuum motor overload
(error code
09
displayed)
1. Check for debris in the vacuum motor(s).
2. Check for worn carbon brushes - replace brushes.
3. Defective motor bearings - repair or replace.
4. Check for a short circuit in the vacuum motor or
wiring - repair or replace.
Vacuum motor contactor
coil overload (error code
10
displayed)
1. Check for a
K1
coil wiring problem or short circuit
(wire colors VIO and BLU).
2. Check the coil resistance. If the coil resistance is
below 80 ohms, replace the coil.
Vacuum motor open (error
code
29
displayed)
1. Check for disconnected vacuum motor wiring.
2. Check for an open circuit in the vacuum motor
wiring or for a defective motor.
3. Check for 36 Volts at the vacuum motor. If 0 Volts,
replace the vacuum motor contactor
K1
.
Vacuum motor contactor
coil open (error code
30
displayed)
1. Check for an open circuit in the
K1
coil and wiring
(wire colors VIO and BLU).
2. Test for 36V at the
K1
coil. If 0 Volts, check the A2
control board assembly.
K1
Vacuum motor contactor
coil short to ground (error
code
31
displayed)
1. Disconnect the
K1
coil wiring (wire colors VIO and
BLU) and check to see if the code disappears.
−
If the code disappears, replace the motor
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.
* A vacuum leak below the waterline will create turbulence in the recovery tank, causing water to enter the
vacuum motor(s).
