Section 7: Troubleshooting
2/10/21
37
Troubleshooting
Problem
Cause
Solution
Product self-feeds
slowly or won’t self-
feed at all
Rotor knives are worn
Rotate, sharpen, or replace rotor knives.
Tractor power take-off speed is below
540 rpm
Set tractor power take-off speed to 540 rpm.
Rotor knives are not sharpened at a
45
o
angle
Resharpen rotor knives to the proper angle.
Plugged rotor and/or discharge chute Clean discharge chute and rotor housing.
Clearance between rotor knife and
ledger knife is too large
Readjust ledger. See
Wood Chipper requires
excessive power to
operate, or stalls
Tractor horsepower is too low
Minimum 35 power take-off hp is required when operating
at maximum capacity.
Rotor knives are dull/worn
Rotate, sharpen, or replace rotor knives.
Overloading feed chute with product
Load feed chute with less product.
Loading feed chute with oversized
product
Feed only product 4" in diameter or smaller.
Product is too green or wet and sticks
to the internal surfaces.
Feed only dry product or alternate between dry and green
product to help keep internal surfaces clean.
Rotor housing is plugged
Clean rotor housing.
Discharge chute is plugged
Clean discharge chute.
Clearance between rotor knife and
ledger knife is too large
Readjust ledger. See
Ledger knife is dull/worn
Rotate ledger knife or replace ledger knife.
Rotor will not turn
Driveline is not engaged
Engage driveline.
Shear bolt in driveline is broken
Replace shear bolt.
Rotor housing is plugged
Clean rotor housing.
Rotor is plugged at the twig breaker
bar.
Clean Rotor around the twig breaker bar.
Bent twig breaker bar
Replace twig breaker bar.
Wood Chipper is
vibrating excessively
Loose rotor knife
Tighten rotor knife to rotor.
Broken or missing rotor knife
Replace broken or missing rotor knives in pairs.
Rotor knives don’t weigh the same
Re-sharpen the heaver rotor knife to remove material from
it until all rotor knives are the same.
Debris & dirt lodged in rotor
Clean rotor.
Bent rotor
Inspect straightness of rotor and rotor shaft. Replace as
rotor and/or rotor shaft if bent.
Bent twig breaker bar making contact
with rotor.
Replace twig breaker bar.
Driveline Vibrates
Worn Universal Joint
Replace Universal Joint.
Section 7:
Troubleshooting