© 2014-2015 Minuteman International, Inc.
Nautilus Hi-Dump Rider Scrubber/Sweeper #988752UM Rev. * 03/16
Page 96
TROUBLESHOOTING CHART
PROBLEM
POSSIBLE CAUSE(S)
SOLUTION(S)
Hydraulic control valve failure
Defective solenoid valve.
Replace solenoid valve or coil.
Switch failure.
Check for loose or disconnected wires.
Hydraulic drive motor failure.
Insuffi cient oil supply.
Fill Reservoir.
Motor leaking.
Replace seals.
Drive pump coupler failed.
Replace.
Key on motor shaft failed.
Replace key.
Drive hub failed.
Replace.
Hydraulic gear pump failure.
Pump leaking.
Replace seals or RR Pump.
Drive coupler failed.
Replace.
Gears worn or scored.
Rebuild pump or RR Pump.
Oil supply low.
Check and fi ll.
Oil strainer clogged.
Replace strainer (inside reservoir).
Incorrect oil.
Use recommended viscosity oil.
Damage due to entry of air into hydraulic
system.
Maintain correct hydraulic fl uid level
in reservoir. Keep suction hose fi ttings
tight.
TROUBLESHOOTING