Nilfisk-ALTO RS 850 - Manual (Page 158)

ENGLISH USER MANUAL
44 33014576(4)2008-02 A RS 850
Problem Possible cause Remedy
SUCTION FAN
The suction fan is noisy Not-lubricated fan bearings Lubricate
Worn fan bearings Replace
The motor is faulty Repair
The suction fan turns but it is not effi cient The dust fi lters are clogged Clean
The suction pipe is clogged Clean
The suction pipe is cut/torn Replace
The gasket between the suction inlet and the
hopper is broken or misadjusted (replace or
adjust) Replace/adjust
There is no pressure at the suction system
motor Adjust the pump pressure
The suction fan does not turn The control valve assembly is stuck Repair
The motor is faulty Replace
Pump failure Replace
SUCTION INLET AND SKIRT
The suction inlet does not collect debris
effi ciently The suction inlet position is incorrect Check the suction inlet and skirt height and
operation
The suction inlet does not lift Open electrical contact Repair the electrical system
The control valve assembly is stuck Repair
The cylinder gaskets are worn Overhaul the cylinder
There is no pressure at the hydraulic system Check the pump pressure
The fuse is blown Replace
Open lifting push-button Replace
Open joystick safety push-button Replace
Relay board failure Overhaul
The solenoid valve is burnt Replace
SUCTION INLET AND SKIRT
The suction inlet does not lower The suction fan is off Activate
There is no pressure at the parachute valve Check the suction fan control valve assembly
pressure
Lack of pressure in the control valve assembly
solenoid valve Check the pressure
The fuse is blown Replace
Deactivated broom switch Activate
Open lowering push-button Replace
Open joystick safety push-button Replace
Relay board failure Overhaul
The solenoid valve is burnt Replace
The suction inlet does not shift sideways Lack of pressure in the cylinder because of
worn gaskets Overhaul the cylinder
The fuse is blown Replace
Open left shifting push-button Replace
Open right shifting push-button Replace
Open safety push-button Replace
Relay board failure Replace
The solenoid valve is burnt Replace
The skirt opening force is not suffi cient The skirt opening pressure is incorrect Adjust the opening pressure
The skirt does not open/close The switch is deactivated Activate
The solenoid valve is burnt Replace