Nilfisk-Advance 7765 Service Manual page 100

Service Manual – Advance 7765 / Nilfisk CR1500
Troubleshooting
General Troubleshooting
Problem
Poor Water Pick-up.
The squeegee
deck will not extend
downward.
Squeegee will not
retract upward.
Squeegee will not
rise when the drive
pedal is moved to
the reverse position.
Cause
The squeegee blades are
torn or worn.
The squeegee assembly is
out of adjustment.
No voltage to the Squeegee
Lock Up (10) solenoid valve.
The Squeegee Lock Up
(10) solenoid valve in the
Cylinder Control Valve not
opening when energized
(stuck closed).
The squeegee is binding.
No voltage to the Squeegee
Cylinder Solenoid (7) in the
Cylinder Control Valve.
The Squeegee Cylinder
Solenoid (7) in the Cylinder
Control Valve not switching
when energized.
The squeegee is binding.
No voltage to the Squeegee
Cylinder Solenoid (7) in the
Cylinder Control Valve.
Correction
Check and replace the blades as necessary.
Readjust the squeegee. (Refer to the Instructions for
Use.)
1. Check circuit breaker CB7 and reset if necessary.
2. Check the wiring from CB7 to the Squeegee Lock
Up (10) solenoid valve and repair as necessary.
1. Check the coil resistance of the Squeegee Lock
Up (10) solenoid valve. If the coil resistance is not
9.8 ohms ±10%, replace the coil.
2. If the coil resistance is within spec, check for
binding or a mechanical problem. Repair or
replace the valve as necessary.
Check for binding or damage in the squeegee lift
mechanism and mounting hardware and correct as
necessary.
1. Check circuit breaker CB8 and reset if necessary.
2. Check the continuity from CB8 through the
Squeegee Blade Switch to the Squeegee
Cylinder Solenoid (7). There should be 12 VDC
to the Squeegee Cylinder Solenoid (7) with the
Squeegee Blade Switch in the squeegee-raise
position.
1. Check the coil resistance of the Squeegee
Cylinder Solenoid (7). If the coil resistance is not
9.8 ohms ±10%, replace the coil.
2. If the coil resistance is within spec, check for
binding or a mechanical problem. Repair or
replace the valve as necessary.
Check for binding or damage in the squeegee lift
mechanism and mounting hardware and correct as
necessary.
• Check the drive pedal reverse sensor function.
The drive pedal reverse sensor should provide 12
VDC to the reverse relay coil when the drive pedal
is moved to the reverse position.
• Check the reverse relay function The reverse relay
should switch to position 87 and provide 12 VDC
to the Squeegee Cylinder Solenoid (7) when the
drive pedal is moved to the reverse position.
Squeegee System 205