MechMaxx B150 6-inch Gas Woodchipper Review (2026): 6-inch Gas Woodchipper
Mid-tier 6-inch gas chipper with a larger engine for heavier yard and light property work.
Demonstration of 6 inch KOHLER E-Start Gas Powered 4-Wheel Drum Wood Chipper with Taillight B150
Manufacturer demo of the B150 drum chipper with the Kohler electric-start engine, covering the four-wheel tow frame and taillights.
- Handles up to 6-inch material
- Larger flywheel than the GS650
- Good price-to-capacity ratio
- No hydraulic feed
- Short warranty
- Heavier than 4-inch competitors
MechMaxx B150 6-inch Gas Woodchipper specs at a glance
- Brand
- MechMaxx
- Model
- B150
- Power type
- gas
- Max branch diameter
- 6"
- Power
- 15 HP gasoline engine
- Feed system
- Manual
- Weight
- 475 lb
- Price (MSRP)
- $1,599
- Warranty
- 1 year
Who should buy the B150 — and who should skip it
- You don't own a tractor (or don't want to tie one up) and need a self-powered chipper.
- Your typical branches are 4–6 inches in diameter.
- You want a capable chipper under $2k without stepping up to commercial-grade pricing.
- You regularly chip forked or crooked wood. Mechanical feed hangs up on these; consider a hydraulic-feed chipper in the same capacity tier.
- You plan to put the chipper through commercial-scale hours (50+ per year). Look for a model with a longer warranty — wearing parts and bearings are the typical failure points.
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 does the B150 use?
- The MechMaxx B150 6-inch Gas Woodchipper is powered by a 15 HP gasoline engine. Parts and service for this engine are typically available through the manufacturer or an authorized small-engine service center.
- What's the maximum branch diameter the B150 can chip?
- The MechMaxx B150 6-inch Gas Woodchipper is rated for branches up to 6 inches in diameter. Green and softwood branches chip reliably at the rated maximum. Seasoned hardwood at the maximum slows the feed rate and bogs the flywheel more — plan for 5-inch hardwood as your comfortable working size.
- What's the warranty on the B150?
- MechMaxx covers the B150 with a 1-year warranty. Wearing parts (blades, belts) are excluded under normal use; commercial-scale use may require the manufacturer's commercial warranty tier.
- How much does the B150 weigh?
- The MechMaxx B150 6-inch Gas Woodchipper weighs approximately 475 lb. It tows behind a standard ATV, UTV, or lawn tractor on the included tow bar.
- How often do the blades on the B150 need sharpening?
- For typical property use (20–40 hours per year), sharpen the B150's blades once per season. Heavy hardwood use cuts that to every 15–20 hours. A full replacement set runs roughly $80–$250 depending on blade count and material. See our woodchipper blade sharpening guide for the full process.
- Where is the B150 made?
- MechMaxx chippers are assembled with globally sourced components. The chipper frame, feed system, and flywheel are imported. MechMaxx distributes from a US warehouse.