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HOLT HGW30 Stump Grinder
Operator’s Manual
Problem
Probable Cause
Solution
Rotor does not spin.
Rotor jammed.
Lock out power and clear debris from
rotor.
Low hydraulic oil level.
Check hydraulic oil level. Add if neces-
sary.
Low hydraulic oil flow.
Have a qualified hydraulic technician
check hydraulic oil flow.
Rotor rotates slow or sluggish.
Low hydraulic oil level.
Check hydraulic oil level. Add if neces-
sary.
Oil hydraulic filter plugged.
Replace hydraulic oil filter.
Relief valve not set properly.
Have a qualified hydraulic technician
set relief valve.
Low hydraulic oil flow.
Have a qualified hydraulic technician
check hydraulic oil flow.
Excessive vibration.
Insufficient hydraulic pressure.
Check hydraulic oil level. Add as
needed.
Debris lodged in rotor.
Lock out power and clear debris from
rotor.
Smoke emitting from engine exhaust
pipe.
Dirty or clogged engine air filter.
Change engine air filter.
9. Troubleshooting
Holt Industrial
4575 Powell Rd.,
Wallenstein, Ontario Canada
N0B 2S0
Phone - 844.444.4658
holtindustrial.com
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