MechMaxx BX42S 4-inch PTO Woodchipper Review (2026)
MechMaxx's sole PTO attachment — a 3-point-hitch 4-inch gravity-feed chipper, the cheapest name-brand 4-inch PTO unit in 2026.
MechMaxx BX42S assembly: 4-inch PTO chipper for 18–45 HP tractors
Manufacturer assembly and walkaround of the BX42S 3-point PTO chipper attachment, covering the Cat-1 hitch and driveline.
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- Cheapest name-brand 4-inch PTO chipper at $1,699 sale ($2,199 reg)
- Wide 18–45 HP tractor compatibility, Cat I three-point
- Heavier than most $1,500 imports — the steel is honest
- Gravity feed only — every branch is hand-fed
- 1-year warranty is the shortest in the segment
- MechMaxx's BBB reputation and parts support are the soft spot
Gravity feed is the headline tradeoff
MechMaxx markets the BX42S hopper as self-feeding, but there are no powered rollers and no hydraulic feed system. The 20x20-inch hopper relies entirely on gravity and the rotor pulling material in once a branch contacts the blades. In practice that means you stand at the hopper and push every limb until it bites. Straight, dry hardwood up to about 3 inches feeds reasonably well. Forked branches, brushy tops, and anything with side limbs has to be trimmed first or wrestled in by hand.
Compare that to a hydraulic-feed unit like the Woodland Mills WC46 or Woodmaxx WM-8H, where you drop a branch in the hopper and walk away. The BX42S is a manual-labor machine. If you have a half-acre of storm debris once a year, that's fine. If you have a working woodlot or you're clearing for hours at a time, the gravity hopper becomes the bottleneck and the reason this chipper is a fraction the price of the alternatives.
BX42S vs Woodmaxx MX-8500G+ at $2,990
The MX-8500G+ is the natural cross-shop. It's also gravity-feed, also a single PTO chipper, but it steps up to 5-inch capacity, a heavier rotor, a 7-year MX-Series warranty, and Woodmaxx's US-based parts and service operation. You pay $1,291 more for the Woodmaxx and you get a meaningfully larger machine plus the support infrastructure the BX42S doesn't have.
The honest framing: if your tractor maxes out around 25-30 HP and your branches stay under 3 inches, the BX42S handles the same work the MX-8500G+ would handle, just with a smaller throat and no warranty backstop. If you have 35+ HP and any chance of feeding 4-5 inch wood, the Woodmaxx is the better long-term buy. The BX42S earns its place only on the bottom end of the HP and use-frequency curve.
BX42S vs Woodland Mills WC46 at $3,220
The WC46 is the chipper compact-tractor owners actually want. It's hydraulic-feed, rated for the same 15-30 HP range as the BX42S, and Woodland Mills has the strongest service reputation of any chipper brand in this segment. At $3,220 it's $1,521 more than the BX42S.
If you can stretch the budget, the WC46 is the recommendation. Hydraulic feed transforms how you use a chipper — you load the hopper and let the machine work. The BX42S asks you to be part of the feed system. Buyers who pick the BX42S over the WC46 are doing it on price, not on capability, and that's a legitimate choice if the budget is fixed. Just go in with eyes open about what you're trading away.
Who MechMaxx actually is
MechMaxx is a New York-registered importer, not a manufacturer. The BX42S is built in China to a common 4-inch PTO chipper pattern that several brands re-badge. MechMaxx holds a 1.2-star Better Business Bureau rating across customer reviews, with consistent complaints about parts availability, warranty fulfillment, and English-language support. The 1-year warranty exists on paper — cashing it in is another matter.
That doesn't make the chipper a bad machine. The steel is heavy, the rotor is reasonably sized, and the 4+1 blade configuration cuts cleanly when sharp. It means you should buy this chipper assuming you'll source replacement blades, shear bolts, and bearings yourself through generic suppliers, and that any major warranty event is likely to be a fight.
What's in the box
- BX42S chipper unit
- PTO shaft with shear pin (Cat 4, 540 RPM)
- Blade set (2 knives, installed)
- 3-point hitch pins (Cat I)
- Hardware bag (bolts, nuts, washers)
- Operator manual
- Tractor (18–45 HP with 540 RPM PTO)
- Quick-hitch adapter (if your tractor uses one)
- Ear protection and safety glasses
Ships on a pallet. Attaches to Cat I 3-point hitch. PTO shaft may need length adjustment — measure before engaging. Spare shear pins not included beyond the one installed.
MechMaxx BX42S 4-inch PTO Woodchipper specs at a glance
- Brand
- MechMaxx
- Model
- BX42S
- Power type
- pto
- Max branch diameter
- 4"
- Power
- PTO-driven, 18–45 HP tractor
- Feed system
- Mechanical self-feeding
- Weight
- 397 lb
- Price (MSRP)
- $1,699
- Warranty
- 1 year
Will the BX42S fit my tractor?
The MechMaxx BX42S 4-inch PTO Woodchipper needs 18–45 PTO HP. Here’s how 26 common compact and utility tractors match up — rated PTO HP, not engine HP (after typical 10–15% drivetrain losses).
| Tractor | Engine HP | PTO HP | Hitch | BX42S verdict |
|---|---|---|---|---|
| Kubota BX23S | 22 | 15 | Cat 1 | Too small |
| Kubota LX2610 | 25 | 19 | Cat 1 | Fits |
| Kubota L2501 | 24 | 19 | Cat 1 | Fits |
| Kubota L3301 | 33 | 26 | Cat 1 | Fits |
| Kubota L3901 | 37 | 30 | Cat 1 | Fits |
| Kubota L4701 | 47 | 38 | Cat 1 | Fits |
| Kubota MX5400 | 55 | 45 | Cat 2 | Fits |
| Kubota M4-071 | 70 | 58 | Cat 2 | Oversized |
| John Deere 1025R | 24 | 18 | Cat 1 | Fits |
| John Deere 2025R | 25 | 19 | Cat 1 | Fits |
| John Deere 3025E | 24.7 | 19 | Cat 1 | Fits |
| John Deere 3032E | 32 | 25 | Cat 1 | Fits |
| John Deere 3039R | 38.2 | 30 | Cat 1 | Fits |
| John Deere 3046R | 45.3 | 37 | Cat 1 | Fits |
| John Deere 4044M | 43.1 | 35 | Cat 1 | Fits |
| John Deere 4066R | 65.9 | 53 | Cat 2 | Oversized |
| Mahindra 1533 | 33 | 26 | Cat 1 | Fits |
| Mahindra 2638 HST | 37.4 | 29 | Cat 1 | Fits |
| Massey Ferguson 1735M | 35 | 28 | Cat 1 | Fits |
| Massey Ferguson 2705E | 49 | 40 | Cat 2 | Fits |
| New Holland WORKMASTER 25S | 24.7 | 18 | Cat 1 | Fits |
| New Holland WORKMASTER 35 | 35 | 28 | Cat 1 | Fits |
| Kioti CK2620 | 24.5 | 20 | Cat 1 | Fits |
| Kioti NX4510 | 45 | 38 | Cat 1 | Fits |
| LS MT225S | 24.4 | 18 | Cat 1 | Fits |
| LS MT342 | 41.3 | 32 | Cat 1 | Fits |
“Fits” = within the manufacturer’s rated PTO HP range. “At limit” = below the minimum by 5–15%, will feel underpowered on seasoned hardwood. “Too small” = undersized for reliable chipping. “Oversized” = above range (works but overkill).
Who should buy the BX42S — and who should skip it
- Cheapest name-brand 4-inch PTO chipper on the market at $1,699 on sale
- Real 4-inch capacity is genuinely useful for storm cleanup and small-lot maintenance
- Fits the 18-45 HP subcompact and compact tractors most rural homeowners actually own
- 397 lb build weight is heavier than most $1,500 imports — the steel is honest
- Cat 1 three-point and 540 PTO mean it bolts up to anything in the segment without adapters
- If you're a hobbyist clearing a few hours a year, hand-feeding is annoying but not disqualifying
- Gravity feed only — no rollers, no hydraulics, every branch is hand-fed
- 1-year warranty is the shortest in the segment (Woodland Mills 3-year, Woodmaxx WM-Series 3-year, MX-Series 7-year)
- MechMaxx holds a 1.2-star BBB rating with documented warranty and parts-support problems
- No US service network — parts come from a warehouse, not a dealer
- Forked branches and brushy tops need to be trimmed before they'll feed cleanly
- Long sessions get tiring fast — this isn't a chipper for production-scale work
Alternatives to the BX42S
$1,521 more. same 4-inch capacity. adds hydraulic feed. 3-year warranty. from Woodland Mills.
$1,196 more. 3.5-inch capacity (0.5 inch smaller). 5-year warranty. from Wallenstein.
$1,291 more. 5-inch capacity (1 inch larger). 7-year warranty. from Woodmaxx.
BX42Saccessories & add-ons
Set of 2 replacement chipper knives for the BX42S PTO chipper.
PTO shaft shear pins. Essential to carry in the tractor toolbox.
Upgraded PTO shaft with larger cross and wider-angle joints. Useful if running at steep 3-point angles.
BX42Sblade replacement & sharpening
Two reversible flywheel knives — on a PTO chipper, always disengage the PTO and let the flywheel stop fully (60+ seconds) before opening the hood.
Parts availability on the BX42S is the weakest in the MechMaxx line; measure your blade and order generic blanks if factory stock is backordered.
- Blade count
- 2 flywheel knives
- Bed knife
- Yes — fixed anvil
- Sharpening angle
- 35–40°
- Reversible
- Yes — doubles edge life
- Blade material
- Hardened alloy steel
- Replacement set
- $80–$130
- Sharpening interval
- 20–30 hours
- Bolt torque
- 45–55 ft-lb
- 01Stop the machine and isolate power
Disengage the PTO, shut the tractor off, and remove the key. Wait 60+ seconds for the BX42S flywheel to stop completely — it coasts longer than the engine.
- 02Open the discharge or flywheel access cover
Remove the bolts on the BX42S flywheel access hood (or flip the hinged hood if equipped). Swing it clear so you have line-of-sight to every blade position.
- 03Rotate the flywheel to the first blade
Turn the flywheel by hand until the first of the 2 knives is aligned with the access opening. Mark it "1" with a paint pen so you can keep track of orientation.
- 04Break the blade bolts loose
Use a breaker bar on each of the 2 blade bolts. Woodmaxx and Woodland Mills both thread-lock these at the factory; heat gently if they don't yield. Do not pry on the flywheel itself.
- 05Slide the blade out and inspect
Remove the blade and inspect for cracks, nicks deeper than 1/16", and rounded bevels. A cracked blade goes straight in the scrap bin — never re-sharpened.
- 06Flip or replace the blade
The BX42S uses 2 reversible knives. If the secondary edge is still clean, simply flip the blade for a fresh edge. If both edges are worn, sharpen at 35–40° on a belt sander — quench every 10–15 seconds to avoid bluing the Hardened alloy steel.
- 07Balance the set
Remove equal material from every blade in the set. On the BX42S's 2-knife flywheel, even a 1–2 gram imbalance shows up as vibration at operating RPM. Weigh on a gram scale after sharpening.
- 08Reinstall and torque
Apply anti-seize to the bolt threads (not the heads) and torque in a star pattern to 45–55 ft-lb. Use fresh lock washers — reused washers are the #1 cause of a loose blade downstream.
- 09Repeat for every remaining blade
Rotate the flywheel and repeat steps 3–8 for the remaining 1 knives. Then inspect the fixed bed knife — if the edge is rounded, flip or replace it and reset the blade-to-anvil gap to ~0.030" with feeler gauges.
- 10Close up and test-run
Rotate the flywheel by hand one full revolution to confirm no contact with the bed knife or housing. Close the access cover. Start the tractor, engage PTO at low idle, and listen for 30 seconds before ramping to operating RPM. Feed one small test branch before returning to normal work.
BX42S — frequently asked questions
- Does the BX42S have hydraulic feed?
- No. The BX42S is gravity-feed only. There are no powered infeed rollers and no hydraulic system on the chipper. You feed every branch by hand through the 20x20-inch hopper.
- What size tractor do I need?
- MechMaxx specs the BX42S for 18-45 HP at the PTO, 540 RPM, Category 1 three-point hitch. That covers most subcompacts and compacts including the John Deere 1025R, Kubota BX series, Mahindra eMax, and similar. At the bottom of the HP range expect slower feed rates on hardwood.
- Is it really 4-inch capacity?
- The 4-inch rating is realistic for straight, dry hardwood. Green wood, knotty wood, and anything with side branches will feed closer to 3 inches in practice. The hopper itself is 20x20 inches, so brush handling is decent for a gravity unit.
- How does the price compare to alternatives?
- At $1,699 on sale (regular $2,199), the BX42S is roughly half the price of the next-cheapest name-brand PTO chipper. Woodland Mills TFG55 PTO runs $2,415, Wallenstein BX36S is $2,895, Woodmaxx MX-8500G+ is $2,990, and Woodland Mills WC46 is $3,220. The price gap reflects feed system, warranty length, and brand support, not steel weight.
- Will I be able to get parts?
- Wear items like blades, shear bolts, and belts are generic enough that aftermarket sources work. Anything chipper-specific — housing parts, bearings keyed to the rotor shaft, the PTO driveline — depends on MechMaxx having inventory, and customer feedback suggests that's inconsistent. Plan to be your own parts department.
- Is the 1-year warranty worth anything?
- Legally yes, practically it depends on MechMaxx's responsiveness. BBB reviews show a pattern of slow or contested warranty claims. If warranty backing matters to you, this is not the chipper to buy.
- What are the common problems with the BX42S?
- The most-reported issue is feed hang-ups on forked or crooked branches — the mechanical self-feed works well on straight material but stalls on irregular shapes. Clear jams by hand (with the PTO disengaged). Discharge chute clogging on wet chips is also common. Both are operational, not defects.
- BX42S vs wallenstein bx42s — which should I buy?
- See our head-to-head comparison for the detailed breakdown. In short: the BX42S at $1,699 offers 4-inch capacity with mechanical self- feed. The right pick depends on your tractor HP, branch size, and whether you need hydraulic feed for forked material.
- Will the BX42S work on a kubota bx23s?
- Check your tractor's rated PTO HP (not engine HP). The BX42S needs 18–45 PTO HP. Most kubota bx23s tractors produce enough PTO HP, but verify your specific model's PTO output in the owner's manual. Also confirm your 3-point hitch lift capacity can handle 397 lb. See our tractor compatibility table above for 26 common tractor models.
- How do I replace or sharpen the blades on the BX42S?
- The BX42S uses hardened steel reversible blades. Sharpen once per season for typical use (20–40 hours/year), or every 15–20 hours under heavy hardwood load. A replacement blade set runs roughly $80–$250 depending on the model. See our blade sharpening guide for the step-by-step process.
- BX42S vs titan bx42s same chipper — which should I buy?
- See our head-to-head comparison for the detailed breakdown. In short: the BX42S at $1,699 offers 4-inch capacity with mechanical self- feed. The right pick depends on your tractor HP, branch size, and whether you need hydraulic feed for forked material.
- Is the BX42S worth buying?
- At $1,699, the BX42S is the entry tier — good for occasional homeowner use but limited capacity. The 1-year warranty is shorter than competitors — factor that into your decision. Buy through Amazon for easier return protection.
- How much HP do I need to run the BX42S?
- The BX42S needs 18–45 PTO HP. That's PTO horsepower (roughly 85–90% of engine HP). A 21 HP engine tractor produces about 18 PTO HP. Comfortable range: 23–41 PTO HP.
- What warranty does the BX42S come with?
- MechMaxx covers the BX42S with a 1-year warranty. Covers manufacturing defects; excludes wearing parts and cosmetic damage.
- What can the BX42S actually chip in real-world use?
- Rated for 4-inch branches. In practice, green softwood chips reliably at rated max. Seasoned hardwood at 4 inches slows the feed rate and bogs the flywheel on knots — comfortable working capacity on hardwood is 2.5–3.5 inches. The mechanical feed handles straight material well but can stall on forked branches.