MechMaxx B150 6-inch Gas Woodchipper Review (2026)
Mid-tier 6-inch gas drum chipper with a 15 HP Zonsen engine and gravity self-feed. Sold in multiple engine variants (Zonsen / Kohler / Honda).
MechMaxx B150 demo: 6-inch Kohler gas drum chipper with tow frame
Manufacturer demo of the B150 drum chipper with the Kohler electric-start engine, covering the four-wheel tow frame and taillights.
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- Handles up to 6-inch material with drum self-feed
- DOT-rated tires, taillights, and tow bar — genuinely roadable
- 2-year engine + 2-year machine warranty (longer than 1-yr GS650)
- No hydraulic feed — forked or limby brush needs hand assistance
- Zonsen engine has thin US parts support outside MechMaxx
- MechMaxx customer-service reputation is mixed on warranty claims
What you actually get for $2,599
The B150 ships as a 6-inch drum chipper on four wheels with a tow bar, DOT-rated rear tires, synchronized taillights, an emergency stop bar, and a 360-degree rotating discharge chute. The base configuration runs a Zonsen GB460B 459cc single-cylinder OHV engine rated at 15 HP, with a 14-inch by 12-inch drum carrying reversible A8 blades and twin Kevlar V-belts on a 20:1 reduction. Net weight is 573 lb, gross 639 lb — heavier and more roadable than older listings suggest.
MechMaxx markets the B150 as self-feeding, which on a gravity drum means the rotating cutter pulls straight branches through on its own once they engage. There is no hydraulic infeed roller. In practice owners report clean self-feed on softwood and seasoned material up to about 4 inches, with forked or springy 5-6 inch hardwood requiring you to push and back off. Treat the 6-inch capacity as a peak rating, not a sustained throughput number.
B150 vs MechMaxx GS650 — the intra-brand call
The GS650 is MechMaxx's entry 4-inch chipper at $1,099 with a 7 HP engine and a 220 lb frame. The B150 is more than double the price, more than double the weight, and steps up both engine displacement (459cc vs 212cc) and capacity ceiling (6 inches vs 4). For a homeowner who chips occasional pruning waste under 3 inches the GS650 is the right call — you will never use what the B150 offers. For anyone clearing storm brush, multi-acre cleanup, or anything with regular 4-6 inch material, the GS650 will stall on hardwood and the B150 earns its $1,500 premium.
The decision is mostly about your worst-case branch, not your average branch. If 80 percent of what you feed is under 3 inches and the rest is occasional, the GS650 plus a chainsaw for the big stuff is cheaper than buying chipper capacity you use twice a year. If your worst-case is a storm-down 5-inch oak limb, the GS650 wastes your afternoon and the B150 finishes the job.
B150 vs MechMaxx DCH7 — the step up that matters
The DCH7 is the next tier — a meaningful premium over the B150 — and the differences are real. The DCH7 runs a hydraulic-feed system, adds an inch of capacity (7 vs 6), and (in the DCH7H variant) gets you onto Honda's parts and service network for the next decade. The B150's Zonsen engine is competent but generic; finding parts in five years means going through MechMaxx, which several forum owners report as slow and inconsistent on warranty claims.
For most buyers without a tractor, the dollars to move from B150 to DCH7 are the single best dollars in the MechMaxx lineup. You are not just buying an extra inch — you are buying hydraulic feed (no more forked-branch wrestling), longer-lived engines, and resale value. The B150 makes sense if budget is hard-capped under $3,000.
The MechMaxx tax — what you are accepting
MechMaxx Inc. is a New York-registered importer of China-sourced equipment, not BBB-accredited, and the BBB profile carries a meaningful complaint history — customer reviews describe defective units shipped with no replacement, slow shipping after fast credit-card charges, 3 percent cancellation fees inside 24 hours, and warranty support that ranges from polite-but-unhelpful to silent. Forum threads on ArboristSite and TractorByNet echo the same pattern: the equipment itself is generally serviceable, but post-sale support is where the value proposition cracks.
What this means in practice: budget for self-service. Order spare blades and a spare set of V-belts with the chipper, expect to diagnose engine issues through generic Zonsen channels rather than MechMaxx, and treat the 2-year warranty as a paper benefit that may or may not materialize on a real claim. If that math works for you — and for a lot of rural buyers who already wrench on their own equipment, it does — the B150 is a defensible buy. If it does not, the price gap to a Patriot CSV-3100B or DR Wood Chipper Shredder is worth closing for the support alone.
What's in the box
- B150 chipper unit (partially assembled)
- Blade set (2 knives, installed)
- Tow bar with hitch pin
- Spark plug wrench
- Tool kit (wrench set for assembly)
- Hardware bag (bolts, nuts, cotter pins)
- Discharge chute
- Operator manual
- Gasoline
- Engine oil for first fill (SAE 10W-30)
- Ear protection and safety glasses
Ships on a pallet via freight. Tow bar and discharge chute require assembly. Engine ships dry — add oil before first start.
MechMaxx B150 6-inch Gas Woodchipper specs at a glance
- Brand
- MechMaxx
- Model
- B150
- Power type
- gas
- Max branch diameter
- 6"
- Power
- 15 HP Zonsen GB460B (Honda GX390 variant at $3,499)
- Feed system
- Mechanical self-feeding
- Weight
- 573 lb
- Price (MSRP)
- $2,599
- Warranty
- 2 years
Who should buy the B150 — and who should skip it
- Cheapest path to a true 6-inch gas drum chipper with self-feeding action
- DOT-rated tires, synchronized taillights, and tow bar make it genuinely roadable between properties
- Two-year warranty on both engine and machine matches Woodmaxx-class coverage on paper
- 459cc 15 HP Zonsen engine is competent for 4-5 inch sustained feed
- Reversible A8 blades and Kevlar V-belts are commodity parts, easy to source aftermarket
- 360-degree rotating discharge chute and emergency stop bar are standard, not upsells
- MechMaxx customer-service reputation is documented as slow and inconsistent on warranty claims
- Zonsen engine has no dealer network — parts and service go through MechMaxx, not a third party
- Not BBB-accredited; BBB profile carries a complaint pattern on defective units and refund disputes
- Step up to the DCH7 for hydraulic feed, an extra inch of capacity, and (in the DCH7H variant) a Honda GX engine
- No hydraulic feed — forked, limby, or springy 5-6 inch material requires hands-on assistance
Alternatives to the B150
B150accessories & add-ons
Set of 2 replacement chipper knives for the B150. Available on Amazon.
Weather-resistant cover for the B150. Larger than GS650 cover due to wider frame.
Replacement shear pins. Carry spares in the field — a tripped pin means downtime without them.
B150blade replacement & sharpening
Two reversible flywheel knives and a bed knife — the larger 6-inch throat means knicks from hidden nails or gravel are more common than on the GS650.
Bolts on the B150 are prone to galling; use anti-seize on the threads at reinstall.
- 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
- $95–$150
- Sharpening interval
- 25–35 hours
- Bolt torque
- 45–55 ft-lb
- 01Stop the machine and isolate power
Shut the engine off, disconnect the spark-plug boot, and wait until the B150 flywheel has fully stopped. Do not open the hood while it is still spinning down.
- 02Open the discharge or flywheel access cover
Remove the bolts on the B150 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 B150 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 B150'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 engine and idle for 30 seconds before ramping to full RPM. Feed one small test branch before returning to normal work.
B150 — frequently asked questions
- What engine is in the MechMaxx B150?
- The base B150 at $2,599 ships with a Zonsen GB460B 459cc 15 HP engine. MechMaxx also sells a Kohler 429cc 14 HP variant and a Honda GX390 389cc 11.7 HP variant at $3,499 under the same B150 model designation. The Honda variant is rebadged as a B150 but is essentially the same chassis with a premium engine — confirm engine on the listing before purchase.
- Is the MechMaxx B150 truly self-feeding?
- It is drum self-feeding, not hydraulic. The rotating drum pulls straight branches in once they engage the blades, and the owner's manual explicitly warns against forcing material. There are no powered hydraulic infeed rollers like you would find on a Woodmaxx WM-8H. Expect to assist forked or limby material by hand.
- What is the actual MechMaxx B150 warranty?
- Two years on the machine and two years on the engine, per the current mechmaxx.com listing. This is better than several budget competitors and matches Woodmaxx's standard warranty length. The harder question is enforcement — MechMaxx's customer-service track record on warranty claims is mixed, so plan to document defects with timestamped photos and video before contacting support.
- Will the B150 handle 6-inch hardwood?
- Six inches is the peak rated capacity, not sustained throughput. Green softwood at 6 inches chips fine. Seasoned 6-inch hardwood will require slow feeding and the drum will lose speed on knots and forks. Realistic comfortable working range is 4-5 inches; treat the 6-inch number as a ceiling for occasional limbs, not your daily feed.
- Is MechMaxx a legit company or a drop-shipper?
- MechMaxx Inc. is a registered New York entity importing China-manufactured equipment, with US warehousing. They are not a pure drop-shipper, but they are also not a domestic manufacturer with a dealer network. Parts and service flow through MechMaxx directly. The BBB profile shows the company is not accredited and carries a customer-complaint pattern around defective units, slow shipping, and warranty disputes.
- What are the common problems with the B150?
- 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.
- How hard is the B150 to assemble?
- The B150 ships partially assembled. Typical setup involves attaching the discharge chute, connecting the tow bar, checking engine oil and fuel, and adjusting the blade gap. Plan for 45–90 minutes with the included hardware and a basic socket set.
- B150 vs gs650 — which should I buy?
- See our head-to-head comparison for the detailed breakdown. In short: the B150 at $2,599 offers 6-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.
- What can the B150 actually chip in real-world use?
- Rated for 6-inch branches. In practice, green softwood chips reliably at rated max. Seasoned hardwood at 6 inches slows the feed rate and bogs the flywheel on knots — comfortable working capacity on hardwood is 4.5–5.5 inches. The mechanical feed handles straight material well but can stall on forked branches.
- Is the B150 worth buying?
- At $2,599, the B150 is the value sweet spot — enough capacity for regular property use without commercial pricing. The 2-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 B150?
- The B150 has a built-in 15 HP Zonsen GB460B (Honda GX390 variant at $3,499). No external power source needed.
- What warranty does the B150 come with?
- MechMaxx covers the B150 with a 2-year warranty. Covers manufacturing defects; excludes wearing parts and cosmetic damage.