Morbark shows up used as two different animals. The M-series are hand-fed roller chippers in the 12- to 20-inch range. The Beever towables are trailer-mounted production machines. So "shopping a used Morbark" is not actually a decision. Working out which of those two you need is the decision, and this page is mostly about why one of them is a much safer purchase than the other.
First, a paperwork trap that costs people listings. Morbark spells it Beever. The listing sites mostly render the same product family as "Eeger Beever" or "Eager Beaver." Search all three spellings or you will only see half the market.
M12R: 12-inch, hand-fed, hydraulic feed
The M12R is a 12-inch disc-style hand-fed chipper. A hydraulic motor drives the lower feed roller through a collet fitting, and that bearing sits behind a small access door on the machine. Remember that door, because it decides most of what follows. Same job as a Bandit 250XP or a Vermeer BC1000XL: operator-controlled feed, disc cutting, compact enough for a tight site.
It is the "R" line, alongside the M15R, M18R and M20R, so what you learn about the feed-roller architecture here carries up the range.
What the M12R sells for, and what the listings won't tell you
Two asking prices with dollar figures attached, from an August 2026 sweep:
- $24,900, 2015 M12R, Van Buren Township, MI, trusted-seller badge. Hours not listed.
- $21,000, 2018 M12R, Santa Ana, CA. Marked no longer available at the time of the sweep, so treat it as a recent-historical comp, not a live ask.
On the machinery-trader side you get the opposite problem: hours with no price. A 2016 M12R in Constantia, NY at 659 hours. A 2018 M12RX, the extended-capacity variant, in Oakdale, CA at 429 hours.
So here is the honest read. Not one listing disclosed price and hours together. The low-$20Ks is a real band for a used M12R, but anybody telling you what hours that band buys is guessing. Plan on establishing hours yourself, and treat an ask above $25,000 with no hours disclosed as a negotiating flag rather than a fact about the machine.
One more sorting note: an M12D is a drum-style machine, not the same platform. Do not comp one against the other just because the model numbers look close.
The M12R failure worth knowing before you buy
Both lower feed roller bearings can go at once, and when they do it is not subtle. From a documented replacement job on one: "these bearings were both bad, this one all the balls fell out while we were" working on it.
The root cause is the part that matters to a buyer. The tech found the housing "jam-packed full of Filth because that's what kills these bearings and it's most likely the reason why a lot of people" replace them. He tied it directly to running the machine with the bottom access door down.
Read that carefully, because it is good news. That is an operator-maintenance problem, not a design defect. It is visible during a pre-purchase inspection, and a machine that was run right does not have it.
The repair punishes improvised tooling
Getting at that bearing means pulling the hydraulic feed motor off its collet. The tech in that video, working without a press, mushroomed out the tip of the shaft trying to press the old bearing race off, and separately had the outer section of the flange come off the bearing. His own conclusion was that a hydraulic press or a proper bearing puller makes the job manageable.
For a buyer, that translates to one line: this is shop work unless your shop is properly equipped. No Morbark parts-counter price for the lower feed roller bearing has been published. The "couple hundred dollars" figure that gets quoted around for chipper bearings comes from a cross-brand disc-chipper repair, so use it as an order of magnitude and get a real quote from a Morbark dealer.
The two-minute M12R inspection
Open the lower feed roller bearing access door and look inside.
Packed with dirt and debris tells you why the price is low, or why the last owner gave up on it. Clean, with an intact seal, is the single best signal you will get that this machine was run by somebody who cared. A cracked, missing, or wrong seal means you are buying somebody else's bearing job.
Two minutes, no tools, and it predicts the most common expense on this machine. Do it before you talk price, not after.
Beever 1821: the 18-inch towable, and a thin paper trail
The 1821 is the 18-inch machine at the top of the towable Beever family, above the 1215 and 1415. Trailer-mounted, highway-rated, production work.
Now the part a buyer needs straight. This model barely appears in the resale data at all. A brand-level sweep of the major listing sites in August 2026 returned no Beever or Eager Beaver 1821 listings. Zero. The closest size-adjacent machine that surfaced was an Eeger Beever 1621X in Locust Grove, GA at 1,432 hours, with no price shown.
There is one figure in circulation, a 2020 Eager Beaver 1821 at $34,900 in Atlanta, GA. It comes from earlier research on a sibling model and could not be reproduced. Do not anchor an offer to it.
Failure documentation is just as thin. There is no 1821-specific repair video or forum thread to send you to. The Beever towables share Morbark's hydraulic lower-feed-roller architecture with the M-series, so the bearing pattern above is architecturally plausible on an 1821. But that is a design inference, not a documented case on this model, and it is worth being clear about the difference.
What the knife specs actually say
Morbark's brand-level knife guidance for the disc and drum brush-chipper line: two-sided knives can be rotated 180 degrees and reinstalled to get a second life out of them. Knife holders get discarded and replaced if gouged more than 3/16 inch deep. Knife clamps get replaced if cracked or damaged.
There is also a wear limit stated at one inch before a knife is discarded, but the source captions are garbled on exactly which dimension that inch refers to. Confirm it against the operator's manual for your specific machine before you scrap a set of knives on that number.
These are service intervals for a machine you keep, not predictions about what breaks first.
Choosing between them
The M12R is the safer buy, and not by a little. One well-documented failure mode, an obvious root cause you can inspect for in two minutes, a real price band, and a dealer network behind the parts. You know what you are taking on.
The Beever 1821 is a specialty purchase. No confirmed price comps, no model-specific failure record, and a resale market thin enough that finding a buyer may be slow when you want out. Buy it because you specifically need 18-inch towable capacity and can afford to troubleshoot a platform nobody has written up. Not because it looks like a deal.
If 18-inch is the requirement but the uncertainty is not, price a documented alternative in that class before committing, and consider a Beever 1215 or 1415 with real comps and service records instead.
For a 12-inch machine you can actually comp, compare the M12R against the Bandit 250XP in the same capacity class and price band. Then, whichever Morbark you are looking at, do two things before you make an offer: open the lower feed roller bearing door and photograph what is inside, and call a Morbark dealer for a written price on that bearing. Together they cost you a phone call, and they tell you more than the hour meter ever will.