Woodmaxx WM-8H 8-inch Hydraulic-Feed PTO Woodchipper Review (2026)
8-inch hydraulic-feed PTO chipper — the most common Woodmaxx unit on mid-frame tractors.
Woodmaxx WM-8H in action: chipping 4-inch hardwood through hydraulic feed
Owner demo of the WM-8H pulling a 4" hardwood limb through the hydraulic dual-roller infeed on a compact utility tractor.
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- 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 what separate it from mechanical-feed units like the Woodmaxx WM-8M. The 2026 Woodland Mills WC68 also runs hydraulic feed now, so the WM-8H's advantage over the WC68 isn't feed type — it's the extra 2 inches of capacity (8 vs 6). 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 hydrostatic feed system, and a 7-year transferable warranty instead of 3. It costs $6,225 versus the WM-8H's $4,095 — a $2,130 gap. For most buyers the WM-8H is the clear value pick: 3 years covers typical break-in failures, and the chipper itself is fundamentally the same 8-inch hydraulic machine.
Buy the MX-8800 only if you're running commercial-adjacent volume (50+ hours per year), planning to keep the chipper 10+ years, or actually need the upgraded flywheel and hydrostatic feed for sustained hardwood throughput. At a $700 gap the MX-8800 was an easy upsell; at $2,130 it's a deliberate premium, not a default.
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.
What's in the box
- WM-8H chipper unit
- PTO shaft with shear pin (540 RPM)
- Blade set (2 knives, installed)
- Hydraulic feed roller assembly (installed)
- Hydraulic hoses and fittings (for tractor remote hookup)
- 3-point hitch pins (Cat I / Cat II)
- Discharge chute
- Hardware bag
- Operator manual
- Hydraulic fluid — 7 gallons ISO-46 (est.) if tractor remotes are not pre-plumbed
- Tractor (30–80 HP with 540 RPM PTO and rear hydraulic remotes)
- Quick-hitch adapter (if your tractor uses one)
- Ear protection and safety glasses
Ships freight. Hydraulic feed uses your tractor's rear remotes. Confirm your tractor has at least one set of rear hydraulic remotes before ordering. Hoses are included but may need adapters for your specific tractor brand.
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)
- $4,095
- 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.
Alternatives to the WM-8H
$2,996 less. 4-inch capacity (4 inch smaller). mechanical feed (simpler, cheaper). 1-year warranty. from MechMaxx.
$1,770 less. 4-inch capacity (4 inch smaller). mechanical feed (simpler, cheaper). 2-year warranty.
$596 less. 7-inch capacity (1 inch smaller). mechanical feed (simpler, cheaper). 2-year warranty. from MechMaxx.
WM-8Haccessories & add-ons
Set of 2 replacement chipper knives for the WM-8H. Available from woodmaxx.com parts catalog.
Replacement hydraulic feed hoses and fittings. Inspect annually for cracking.
PTO shaft shear pins.
Upgraded PTO shaft with wider-angle joints for steep 3-point geometry.
Adapter for iMatch or equivalent quick-hitch systems.
Bundle: replacement blade set and 10-pack of shear pins. Better value than buying separately.
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 hydrostatic feed components, and a 7-year transferable warranty versus 3. Costs $6,225 vs WM-8H's $4,095 — a $2,130 gap. At that delta the WM-8H is the value pick for most buyers; the MX-8800 is the right choice only for commercial-adjacent use or buyers keeping the chipper a full decade.
- 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.
- What are the common problems with the WM-8H?
- The most-reported issues are: hydraulic feed sensitivity (the safety bar can trip on long brush, which is by design), discharge chute clogging on wet chips (clear periodically), and paint chips from freight shipping (cosmetic only). None are mechanical defects — they're operational characteristics owners adapt to within the first few sessions.
- WM-8H vs woodland mills wc68 — which should I buy?
- See our head-to-head comparison for the detailed breakdown. In short: the WM-8H at $4,095 offers 8-inch capacity with hydraulic feed. The right pick depends on your tractor HP, branch size, and whether you need hydraulic feed for forked material.
- WM-8H vs mx-8800 — which should I buy?
- See our head-to-head comparison for the detailed breakdown. In short: the WM-8H at $4,095 offers 8-inch capacity with hydraulic feed. The right pick depends on your tractor HP, branch size, and whether you need hydraulic feed for forked material.
- How do I replace or sharpen the blades on the WM-8H?
- The WM-8H uses high-carbon A8 tool steel reversible dual-edge knives. 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.
- Will the WM-8H work on a john deere 3039r?
- Check your tractor's rated PTO HP (not engine HP). The WM-8H needs 30–80 PTO HP. Most john deere 3039r 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 1295 lb. See our tractor compatibility table above for 26 common tractor models.
- What can the WM-8H actually chip in real-world use?
- Rated for 8-inch branches. In practice, green softwood chips reliably at rated max. Seasoned hardwood at 8 inches slows the feed rate and bogs the flywheel on knots — comfortable working capacity on hardwood is 6.5–7.5 inches. The hydraulic feed handles forked and crooked material well.
- Is the WM-8H worth buying?
- At $4,095, the WM-8H is the mid-to-premium tier — justified for regular use on wooded properties or buyers who want long-term reliability. The 3-year warranty is shorter than competitors — factor that into your decision.
- How much HP do I need to run the WM-8H?
- The WM-8H needs 30–80 PTO HP. That's PTO horsepower (roughly 85–90% of engine HP). A 35 HP engine tractor produces about 30 PTO HP. Comfortable range: 38–72 PTO HP.
- What warranty does the WM-8H come with?
- Woodmaxx covers the WM-8H with a 3-year warranty. Covers manufacturing defects; excludes wearing parts and cosmetic damage.