Woodmaxx WM-8H 8-inch Hydraulic-Feed PTO Woodchipper Review (2026): 8-inch Hydraulic-Feed PTO Woodchipper
8-inch hydraulic-feed PTO chipper — the most common Woodmaxx unit on mid-frame tractors.
Chipping 4 inch diameter limb
Owner demo of the WM-8H pulling a 4" hardwood limb through the hydraulic dual-roller infeed on a compact utility tractor.
- Hydraulic rollers pull forked wood without stalling
- 8-inch capacity handles most property cleanup
- Reversible feed for safety
- 3-year WM warranty (vs 7-year MX-Series)
- More maintenance than mechanical feed
Why hydraulic feed matters
The hydraulic feed rollers on the WM-8H are the reason to buy this chipper over a mechanical-feed unit like the WM-8M or Woodland Mills WC68. Crooked branches, forks, and limby yard trees that hang up mechanical feeds get pulled through reliably by hydraulics. If you chip mostly clean, straight wood you might not need this. For real-world brush cleanup, you do.
The feed is reversible — which is both a safety feature (you can back out jams) and a productivity feature (you can partially feed a branch, let it align, then push it the rest of the way).
WM-8H vs MX-8800: the real decision
The MX-8800 is the newer MX-Series version of the WM-8H with a heavier flywheel, upgraded feed system, and a 7-year warranty instead of 3. It's about $700 more. For most buyers the WM-8H is the better value — 3 years covers typical break-in failures, and the chipper itself is fundamentally the same machine.
Buy the MX-8800 if you're running commercial-adjacent volume (50+ hours per year), if you plan to keep the chipper 10+ years, or if the upgraded flywheel's sustained feed rate matters for your workload.
Tractor sizing and PTO HP
The WM-8H spec calls for 30–80 HP tractors. That's rated engine HP, but what matters is PTO HP — and most tractors show 10–15% lower PTO HP than engine HP. A 35 HP engine tractor typically produces ~30 PTO HP, right at the minimum. Running at minimum works but slows the feed rate. The sweet spot is 40–60 PTO HP.
Woodmaxx WM-8H 8-inch Hydraulic-Feed PTO Woodchipper specs at a glance
- Brand
- Woodmaxx
- Model
- WM-8H
- Power type
- pto
- Max branch diameter
- 8"
- Power
- PTO-driven, 30–80 HP tractor
- Feed system
- Hydraulic
- Weight
- 1295 lb
- Price (MSRP)
- $4,795
- Warranty
- 3 years
Will the WM-8H fit my tractor?
The Woodmaxx WM-8H 8-inch Hydraulic-Feed PTO Woodchipper needs 30–80 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 | WM-8H verdict |
|---|---|---|---|---|
| Kubota BX23S | 22 | 15 | Cat 1 | Too small |
| Kubota LX2610 | 25 | 19 | Cat 1 | Too small |
| Kubota L2501 | 24 | 19 | Cat 1 | Too small |
| Kubota L3301 | 33 | 26 | Cat 1 | At limit |
| 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 | Fits |
| John Deere 1025R | 24 | 18 | Cat 1 | Too small |
| John Deere 2025R | 25 | 19 | Cat 1 | Too small |
| John Deere 3025E | 24.7 | 19 | Cat 1 | Too small |
| John Deere 3032E | 32 | 25 | Cat 1 | Too small |
| 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 | Fits |
| Mahindra 1533 | 33 | 26 | Cat 1 | At limit |
| Mahindra 2638 HST | 37.4 | 29 | Cat 1 | At limit |
| Massey Ferguson 1735M | 35 | 28 | Cat 1 | At limit |
| Massey Ferguson 2705E | 49 | 40 | Cat 2 | Fits |
| New Holland WORKMASTER 25S | 24.7 | 18 | Cat 1 | Too small |
| New Holland WORKMASTER 35 | 35 | 28 | Cat 1 | At limit |
| Kioti CK2620 | 24.5 | 20 | Cat 1 | Too small |
| Kioti NX4510 | 45 | 38 | Cat 1 | Fits |
| LS MT225S | 24.4 | 18 | Cat 1 | Too small |
| 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 WM-8H — and who should skip it
- You own a tractor with 30–80 PTO HP and a Category 1 or 2 three-point hitch.
- Your typical branches are 6–8 inches in diameter.
- You regularly chip forked, crooked, or limby brush that hangs up on mechanical-feed chippers.
- You don't own a tractor. A gas-standalone chipper of comparable capacity is the right category for you.
- Your tractor produces less than 30 PTO HP. Size down to a 5–6 inch chipper matched to your tractor, or the feed rate will crawl.
- You'll chip only a few times per year. At $4,795, renting might be cheaper — see our rental vs buying calculator.
WM-8Hblade replacement & sharpening
The WM-8H is the most-serviced chipper in the Woodmaxx catalog; factory blade sets are stocked and ship in 2–5 days.
Two A8 flywheel knives plus a reversible bed knife — flip the bed knife once before ordering a new one.
Hydraulic feed masks dull blades; sharpen on hours, not on feel.
- Blade count
- 2 flywheel knives
- Bed knife
- Yes — fixed anvil
- Sharpening angle
- 30–40°
- Reversible
- Yes — doubles edge life
- Blade material
- A8 tool steel
- Replacement set
- $170–$230
- Sharpening interval
- 25–40 hours
- Bolt torque
- 50–60 ft-lb
- 01Stop the machine and isolate power
Disengage the PTO, shut the tractor off, and remove the key. Wait 60+ seconds for the WM-8H flywheel to stop completely — it coasts longer than the engine.
- 02Open the discharge or flywheel access cover
Remove the bolts on the WM-8H 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 WM-8H 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 30–40° on a belt sander — quench every 10–15 seconds to avoid bluing the A8 tool steel.
- 07Balance the set
Remove equal material from every blade in the set. On the WM-8H'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 50–60 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.
Real owners on the WM-8H
- Hydraulic feed handles crotches cleanly. Multiple owners note the WM-8H pulls forked and gnarly stock that a mechanical-feed machine would reject.
- Needs 35+ PTO HP before it sings. Reports on sub-30 HP compacts describe the engine bogging in seasoned oak; 40–50 HP is the sweet spot.
- Dealer support praised, shipping pallet a common gripe. Owners call Woodmaxx responsive on phone; several note the crate arrives beat up via freight.
“The hydraulic feed on the WM-8H eats crotches my old mechanical chipper would have spit back out. Worth every penny for gnarly wood.”
“Running mine behind a 45 HP Kubota. Feeds 7-inch green maple without a burp. If you are under 35 PTO HP, look at the 6-inch instead.”
“Called Woodmaxx about a bent feed-roller pin on arrival. New part shipped same day, no drama. That alone sold me on the brand.”
“Two seasons in and the knives are still on the original edge. I chip mostly pine and fruitwood. Very happy for the money.”
Quotes are short excerpts used editorially with attribution. Click any source link to read the full thread.
WM-8H — frequently asked questions
- Will the Woodmaxx WM-8H work on a 30 HP tractor?
- Yes, but you'll be running at the minimum PTO HP spec. Feed rate will be slower on hardwood at 8-inch capacity. For 30 HP tractors that primarily chip 6-inch or smaller material, the WM-8H works well. If you'll regularly chip 8-inch material, consider a 35+ HP tractor or step down to the MX-8600 (6-inch, 25–65 HP range).
- WM-8H vs MX-8800 — what's the difference?
- Same 8-inch hydraulic-feed PTO category. MX-8800 has a heavier flywheel, upgraded hydraulic feed components, and a 7-year warranty versus 3. Costs about $700 more. Both are good buys; which one wins depends on how long you plan to keep the chipper.
- Does the WM-8H have reversible feed?
- Yes — the hydraulic feed rollers reverse on demand, which lets you back out jams without shutting down. This is a standard safety feature on hydraulic-feed chippers.
- What's the PTO HP requirement?
- Woodmaxx lists a 30 HP minimum. That's tractor rated HP; PTO HP will be ~10–15% lower. Practical minimum is 35 HP engine / 30 PTO HP. Sweet spot is 45–65 HP.
- How much tractor HP do I need for the WM-8H?
- The Woodmaxx WM-8H 8-inch Hydraulic-Feed PTO Woodchipper is rated for 30–80 PTO HP. That's tractor PTO horsepower after drivetrain losses — rated engine HP is typically 10–15% higher. A 35 HP engine tractor produces roughly 30 PTO HP and would run this chipper at the minimum. The comfortable working range is 38–72 PTO HP.
- Does the WM-8H fit a Category 1 three-point hitch?
- Yes. The WM-8H mounts to a standard Category 1 or 2 three-point hitch and accepts a 540 RPM rear PTO shaft (included). Quick hitch compatibility varies by brand — most John Deere iMatch and Pat's Easy Change hitches accept it with a standard top-link bushing.
- What's the maximum branch diameter the WM-8H can chip?
- The Woodmaxx WM-8H 8-inch Hydraulic-Feed PTO Woodchipper is rated for branches up to 8 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 7-inch hardwood as your comfortable working size.
- What's the warranty on the WM-8H?
- Woodmaxx covers the WM-8H with a 3-year warranty. Wearing parts (blades, belts) are excluded under normal use; commercial-scale use may require the manufacturer's commercial warranty tier.
- Does the WM-8H have reversible hydraulic feed?
- Yes. The WM-8H uses hydraulic feed rollers with a reversible control bar. Reverse lets you back out jams without stopping the flywheel, and lets you align crooked branches before committing them to the chipper. This is standard on all hydraulic-feed PTO chippers in this tier.
- How much does the WM-8H weigh?
- The Woodmaxx WM-8H 8-inch Hydraulic-Feed PTO Woodchipper weighs approximately 1,295 lb. Check your tractor's three-point hitch lift capacity before purchase — a Category 1 tractor typically lifts 1,200–1,800 lb at the hitch pins; Category 2 lifts 2,500+ lb.
- How often do the blades on the WM-8H need sharpening?
- For typical property use (20–40 hours per year), sharpen the WM-8H'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 WM-8H made?
- WM-8H chippers are built with a mix of US-sourced and imported components, assembled and shipped from Woodmaxx's Akron, NY facility. The MX-Series is marketed as using upgraded US-sourced bearings and hydraulics versus the WM-Series.