Nautilus Hi-Dump Rider Scrubber/Sweeper #988752UM Rev. * 03/16
© 2014-2015 Minuteman International, Inc.
Page 97
TROUBLESHOOTING CHART
PROBLEM
POSSIBLE CAUSE(S)
SOLUTION(S)
Hydraulic variable displacement
pump failure.
Pump leaking.
Replace seals.
Relief valve(s) stuck.
Clean or replace relief valve(s) at the
pump.
Drive coupling malfunction.
Replace defective gears.
Control linkage out of adjustment.
Adjust control linkage, check for
binding.
Charge pump gears worn or scored.
Replace defective gears.
Damage due to entry of air into hydraulic
system.
Maintain correct hydraulic fl uid level
in reservoir. Keep suction hose fi ttings
tight.
Hydraulic system noisy.
Air in system.
Check fl uid level in reservoir; check for
loose connections or leaks.
Relief valve dirty or damaged.
Clean or replace.
Loose suction line.
Tighten fi ttings.
Clogged section fi lter or pump inlet line.
Replace fi lter, clear line; change fl uid in
reservoir if dirty and fl ush system.
Internal pump or motor damage.
Inspect and repair.
TROUBLESHOOTING
