A forestry mulcher can hide a great deal of wear. Rock damage should receive particular attention — a replacement rotor can destroy the economics of an apparently cheap purchase.
Use it: Before purchasing any used mulching head or carrier.
A forestry mulcher hides wear better than almost any other attachment. The rotor is largely enclosed, the teeth can be replaced cheaply enough to mask deeper problems, and the housing conceals bearing and gearbox condition.
Rock damage deserves particular attention, because it is the failure mode that destroys the economics of an apparently cheap purchase. A replacement rotor can cost more than the discount that made the machine attractive.
The commercial context matters here. Mulching is priced per hectare, so a head that produces slightly lower output or consumes teeth faster erodes margin continuously rather than failing visibly.
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Inspect
Interpreting the answers
What a good answer looks like
Ticking a box is not the same as being satisfied with the answer. These are the lines where the response itself tells you something.
What you asked
A good answer
A answer that should worry you
Rotor balance
Runs smoothly at speed with no vibration through the carrier.
Vibration, which indicates damage or uneven wear and will destroy bearings.
Tooth holders
Intact and evenly worn, with teeth seating correctly.
Damaged, welded or missing holders. Replacing holders is far more involved than replacing teeth.
Rotor bearings
No play, no noise, no heat after running.
Any of the three. Bearing replacement means rotor removal.
Frame welds and liners
Original construction, with wear liners replaceable and in serviceable condition.
Repair welds on the housing, or liners worn through to the structure.
Working through it
How to use this checklist
Run the head at operating speed before inspecting, and watch for vibration
Inspect the rotor with the door open and good light — surface damage is the clearest indicator of rock strikes
Ask what soil and rock conditions the head has worked in, and check that against what you see
Price a replacement rotor before negotiating, so you know what the downside actually is
Common questions
Frequently asked questions
How do I tell if a mulcher has hit rock?
Open the door and look at the rotor body itself, not just the teeth. Rock strikes leave gouging and deformation on the rotor surface and damage tooth holders rather than simply wearing teeth. Also run the head at speed and feel for vibration through the carrier — an out-of-balance rotor is the clearest sign of accumulated strike damage.
What does a replacement rotor cost?
Enough that it frequently exceeds the discount that made a cheap head attractive, which is why rock damage deserves specific attention. Price a replacement rotor for the model before you negotiate, so you know what the downside actually is rather than discovering it after purchase.
Are worn teeth a problem when buying used?
Teeth themselves are a routine consumable and easily replaced. Damaged or welded tooth holders are a different matter — replacing holders is far more involved, and welded repairs suggest the head has been worked through conditions it was not suited to. Inspect holders rather than teeth.
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