Most used-chipper inspection advice is generic enough to apply to a lawnmower. This one is not. Every check below exists because we have a documented case where skipping it cost somebody real money, and where possible we have attached the dealer quote from that case so you know what the check is worth.
Two of these are free and catch the expensive failures. Do those first.
Free check one: spin the feed wheel by hand
Engine off. Put a hand on the feed wheel and turn it.
If it spins unusually freely, that is the documented symptom of a snapped feed pump drive shaft on the Vermeer BC-XL family. In the case we have on camera, the owner pulled the feed pump off the side and the broken half of the shaft came out attached to it, which the video offers as the field test: if half the shaft comes out with the pump, you have your answer.
What it costs: the dealer quoted about $120 for the shaft alone, or $700 for the full pump assembly, because they would not sell the internal bearing separately. The owner bought the $120 shaft and pressed in his own bearing. Either way, that is a number you want in hand before you agree on a price, not after. Zero-cost check, several hundred dollars of leverage.
Free check two: look at the wiring at the feed switches
Open the control area and look for splices, added wire, or anything that does not match the factory loom at the forward feed switch.
On a Vermeer BC1000XL, an owner chasing a blinking info light, dead autofeed, and a feed roller that stopped whenever the safety bars engaged found a concealed bypass wire running a direct 12 volt connection to the forward feed switch. Somebody had patched around an electrical fault instead of fixing it, and hidden it well enough that the poster called the work "professional."
That is a walk, not a discount. The fault the bypass was hiding, in the closely documented case on the same model, was a magnetic pickup sensor that had drifted out of adjustment and destroyed the main control board: $850 for the board plus a $350 service call, roughly $1,200. You are not being offered a machine with a wiring quirk. You are being offered somebody else's deferred $1,200.
Paint and the meter, read against each other
Walk the machine. A chipper that has genuinely worked shows it: worn paint where operators climb, hydraulic staining under fittings, scarring in the feed housing. Long-running arborist forum testimony in our records has 5,000-plus hour units still running daily, and they do not look new.
The trap runs the other way. A forum poster evaluating a 2000-model-year Bandit 250XP with 1,000 claimed hours did the division and pointed out that comes to 1.37 hours per week across the machine's life, which is not what a commercial chipper does. Another poster in the same thread flagged fresh paint and new stickers on an older unit as a signal of either meter manipulation or a cosmetic flip.
Do that arithmetic yourself on every machine you look at. Claimed hours divided by years of age, then ask whether that is a plausible working life for a commercial unit. When the cosmetics and the meter disagree, believe neither and go to the load test.
Knives and the anvil, including the one fastener that matters
A knife edge runs roughly 25 working hours before resharpening. Bandit's own service video says dull or severely damaged knives "significantly reduce" performance, so a machine with tired knives will underperform its rating in a way that has nothing to do with the engine or hydraulics.
Look at the edge in good light and look at the anvil face for rounding or dishing where the knife should be shearing against it. A worn anvil crushes instead of cutting, which feels like a capacity problem and is not one. A full anvil set on a BC700XL was quoted on camera at about $210 for the lower and about $190 for the side, roughly $400 for the pair. Fresh knives on a machine for sale usually mean the seller just spent money, which is mildly reassuring about the rest of their maintenance.
Then check the locking ring. Bandit's official knife-service video is explicit that the anvil-side retaining nut is held by a locking ring, and if the ring is missing the nut has to be replaced, because the ring is "our locking device." A missing locking ring is cheap to fix and tells you something expensive about whoever serviced this machine last.
Feed roller bearings, the acknowledged weak point
On the 250XP family, the feed roller bearing on the feed-motor side gets called out on camera in blunt terms: "everybody knows that these are horrible." That is a documented weak point on a specific, popular machine, and it belongs on your list for any unit in that family.
Turn the feed rollers by hand with the engine off. They should turn smoothly. Grinding, clicking, or a catch means the bearing is going. On a BC1000XL bearing replacement we have on video, the bearings that came out were "dry, seized up," and the protective cover over them was already broken and cracked before the repair started, which is the sequence: cover fails, contamination gets in, bearing dies. On a related Bandit unit, debris and dirt ingress at the feed-roller bearing housing is named directly as "what eats the bearings."
So look at the covers and seals, not just the bearings. On the price side, our honest position is that we have the part cost and not the job cost. A chipper main bearing is described on camera as "a couple hundred dollars" for the part; we have not sourced a complete replacement total including labor, and we are not going to make one up. Budget the part, ask the shop for the labor, and treat any seller who waves it off as answering a question you did not ask.
Hydraulics: what a worn drive motor looks like
Run the feed under load in both directions and watch how it responds. On a Bandit 280XP, the owner found fluid "bypassing inside" the feed drive motor, which is internal wear leaking pressure past the working surfaces. The feed gets weak and slow rather than stopping outright, so it is easy to blame on the material.
The dealer's diagnostic tell, relayed in that same video, is that a motor that leaks externally versus one that is worn internally is a "dead giveaway" between two different problems. What makes this check worth doing carefully is the price attached to it. The OEM replacement hydraulic drive motor on that machine was $993.44, read off the invoice on camera. That is the hardest single dollar figure in our chipper records.
Also on that machine: the hydraulic pump itself had already been replaced after the owner blew it up, and the feed hoses back to the engine-mounted pump needed replacing in the same session. Hydraulic problems on these machines travel in groups.
Grease points, sliders, and the boring stuff that predicts everything
A dealer walkthrough on an Altec DC1317 is a good template for what neglect looks like even on a machine that runs. The unit being filmed needed a worn zerk fitting replaced at the PTO shaft grease point. The cutting disc has separate inboard and outboard bearing grease points, and on that machine the fitting for one is on the opposite side from the bearing it serves, which is exactly the kind of thing a lazy operator skips for years.
The same walkthrough covers the plastic feed-chute sliders: replaceable wear items that "do wear out but it takes thousands of hours." A worn slider is normal on a high-hour machine and slightly suspicious on a low-hour one, which makes it another honest cross-check against the meter.
Check the grease points. Not because a zerk fitting is expensive, but because an owner who replaced them is an owner who was under the machine regularly.
The load test
Bring your own material, in the species and size you actually run. The seller's pile is selected.
Feed pieces one at a time and watch three things: whether engine speed recovers between pieces, whether the feed pulls steadily or hunts, and whether the autofeed behaves consistently under changing load. A hunting feed roller or a blinking info light on a BC1000XL points at the electronics chain covered above, and an independent diagnostic video attributes most autofeed faults on that model to heat and vibration at the switches and controls on the lower feed stop board.
Also test the safety bars while you are there. On the BC1000XL, engaging them stops the feed roller. That is documented, designed behavior, so it is a thing you can verify rather than assume.
Price it against the band, not the seller's confidence
Observed ranges from live listings in our records: BC1000XL $19,900 to $32,900 across eleven listings, BC700XL $6,900 to $15,900 across sixteen, BC1500 $7,600 to $59,500, BC1800XL roughly $13,000 to $80,000 with outliers flagged, 250XP up to $46,000, the 255XP at $48,800 for a 2021 unit, and Altec DC1317 $1,050 to $16,000.
One honest caveat on comping. The BC1200XL returns far fewer live US listings than the BC1000XL or BC1500 on either side of it, and most of what does appear is "contact for price." That model is genuinely harder to value than its neighbors, and any confident number you are quoted on one deserves more scrutiny than usual.
Walk away if
Bypass wiring at the feed switches, or safety bars that do not stop the feed roller on a machine documented to have that behavior. A missing anvil locking ring paired with a seller who does not know what it is. A feed wheel that free-spins by hand, unless the price already reflects the shaft repair. Feed that stays weak under load with no external leak, which points at the internally worn drive motor and a documented $993.44 part. And an hour meter that fails the division test with fresh paint sitting on top of it.
None of those are dealbreakers if the price accounts for them and the seller is straight with you. All of them are dealbreakers if the seller acts surprised that you looked. The full wear-part economics are in knives and anvils and drum bearing failures, and every model record with its sourced prices is in the database.