Schmidt AS 990 - Water not supplied by water system

Translation of Original Operating Instructions
Airport Sweeper / Airport Stand Cleaner
2017-02-02 126
Hopper not lowering

Electrical control cabinet not closed
Hopper door not opening or closing

Check one-way restrictor valve on valve block
Pick-up unit does not rise

Check electric pilot check valve
 Check hydraulic pressure
Cross brush/disc brush not turning

Check current regulator valve
 Defective electrical controller in current regulator
valve
15.3 Water system
Faults Causes/remedy
Water not supplied by water system

Water tank empty Display
 Water filter dirty
 Solenoid valves do not make contact
 Water pump not operating
 Spray nozzles blocked
 Stopcock on water filter closed
 Solenoid valve for water pump drive
is not switching.
High-pressure water pump:
Bad spraying performance, pressure
fluctuations, vibrations, pressure
loss, increased noise, water in oil
or gearbox, oil leakage, etc.
See the manufacturer's operating instructions.
15.4 Electrical system
Faults Causes/remedy
Defective control functions

Check fuses.
 Check control panel.
Diesel engine speed adjustment
not functioning.

Check fuses.
 Defective electrical controller
Engine shuts down

Coolant too low. Display
 Oil pressure too low Display
 Hydraulic oil too low.
Control panel

Check fuse on control panel.
 Check fuses.