30SG OWNER’S MANUAL
5/6/21
Page 16 of 19
STUMP GRINDER TROUBLESHOOTING GUIDE
CAUTION!!
Always use extreme care when troubleshooting or making adjustments on stump grinder.
Stay clear of cutter wheel when engine is running. Stop engine before disassembling any component.
A. Entire hydraulic system does not operate and the engine is not under load.
1. Low hydraulic fluid in tank.
2. Hydraulic pump-to-engine coupler has
slipped.
3. Main pump suction leaking air into pump
intake.
Add hydraulic fluid until it shows in sight
gauge.
Check for wear and replace both coupler
halves and rubber spider, as needed.
Check main suction hoses and fittings for
leaks and tighten fitting nuts
B. Engine lugs down or dies and tracks and cutter wheel do not turn.
1. Rocks or other obstructions jammed in
cutter wheel housing.
2. Cut depth or swing speed too great.
3. Engine improperly tuned or maintained.
4. Low oil alert causes engine to shut down.
5. Engine losing power due to wear.
Raise cutter head. See if obstruction can be
removed from cutter housing.
Decrease sweep speed or cutting depth.
See engine manual and correct as needed.
This may occur when grinding on hills. Level
grinder, check oil and allow oil alert to reset.
See engine manual.
C. Cutter fails to rotate, but track drive works.
1. Cutter motor worn.
2. Cutter Relief Valve malfunctioning.
3. Cutter drive pump worn.
Rebuild or replace motor. New motors are
available from Barreto Manufacturing.
Adjust Relief Valve to 3500 PSI or replace
relief spring if needed.
Replace pump.
