The head contains a considerable percentage of the technology responsible for production — and usually the majority of unplanned downtime.
Use it: Before purchasing any used head, or any harvester where the head is included.
The head contains a considerable share of the technology responsible for production, and it generates most of the unplanned downtime in a cut-to-length system.
Head hours and machine hours are usually different numbers, and a head can be swapped, rebuilt or replaced independently of the carrier. Establishing its actual history is a separate exercise from inspecting the machine.
The four questions at the end of this list matter more than the visual inspection. Feed motors, saw motor, pins and bushes are the major periodic costs, and knowing when each was last addressed tells you what is coming.
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Inspect
Ask
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
Feed roller condition
Even wear consistent with stated hours, and appropriate for the species processed.
Heavy or uneven wear, or softwood rollers on a head sold as eucalyptus-capable.
Measuring wheel and diameter sensors
Clean, undamaged, with a documented calibration history.
Damage or improvisation. Measuring accuracy is a revenue control, not a convenience.
Head frame
No cracking, and any repair welds documented.
Undocumented weld repairs on the frame, which indicate loading beyond design.
Rotator play
Minimal, with service history available.
Noticeable play, which indicates both accumulated hours and hard use.
Working through it
How to use this checklist
Inspect with the head off the timber and accessible, not while mounted and dirty
Ask the four history questions before inspecting, so you know what to look for
Check species configuration against the work you intend to do
Establish local availability of feed motors, saw motors and valve blocks before buying
Common questions
Frequently asked questions
Can I move a used head to a different carrier?
Often, and that portability is part of the commercial case for buying a head separately. Confirm hydraulic compatibility, control system interface and mounting before assuming it — the electrical and control side is usually the constraint rather than the mechanical fit, and retrofitting a control system can cost more than the price difference you were chasing.
How much does a harvester head rebuild cost?
It depends entirely on what needs doing, which is why the four history questions matter more than a visual inspection. Feed motor and saw motor rebuilds are the major items, with pins, bushes, rollers and knives below them. Get the dates for each, then price the ones that are due — that is your real acquisition cost, not the asking price.
Does species configuration affect a used head's value to me?
Yes. A head configured for softwood is worth less to a eucalyptus operation than the hours suggest, because roller configuration, knife geometry and debarking capability all have to be reconsidered. Check what the head was actually processing, not just what it is nominally capable of.
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