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WoodMaxx WM-8H
WoodMaxx WM-8H
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8" PTO Wood Chipper - with Hydraulic Infeed



Product Code: WM-8H


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WoodMaxxx WM-8H Wood Chipper with Hydraulic Infeed

WM-8H Wood Chipper
The WoodMaxx WM-8H hydraulic auto-feed chipper is a robust self-feeding PTO driven wood chipper attachment that mounts to the 3-point hitch of your tractor. This PTO wood chipper is compact, yet built to withstand commercial use. Dual powered infeed rollers grab and pull material into the chipper head using two powerful hydraulic motors. These motors are powered by the chipper's self-contained hydraulic pump and tank. High quality made in the USA knives are standard equipment on all WM-series wood chippers. The WoodMaxx WM-series chippers are so unique and innovative that they are now patent pending. Attempts have been made to copy this machine, but there is only one WoodMaxx! Check out these features.


- USA and International Patents Pending
- Strength in design, CNC plasma cut structural plate steel
- 19 hp. min. required
- 3-pt. hitch mount - fits category 1 or category 2 (also cat-1 quick hitch)
- 8" x 8" Infeed opening
- 200 lb. 24" Diameter Flywheel (dynamically balanced)
- Two Reversible Made in the USA fly wheel knives, 1 bed knife (anvil)
- 1120 RPM Flywheel speed
- Tachometer/ Hour meter (to ensure proper flywheel speed)
- Hydraulic powered infeed system w/dual counter rotating motors
- Self-contained hydraulic system (no hydraulics required from tractor)
- Variable infeed speed 10-75 ft. /min.
- Nylon protected hydraulic hose wrap
- JIC standard hose fittings
- Hardened 6.25" dia. chisel type infeed roller
- Quick hitch compatible (category 1 quick hitch only)
John Deere I-match/Land Pride QH10 require a special top link)
- 360 Degree swivel discharge chute
- Adjustable base legs w/ skid shoe type base
- Automatic hydro pump belt tensioner
- High flow chamber ventilation - 2" diameter main shaft
- Three Heavy duty cast steel main shaft bearings
- Adjustable infeed roller down pressure
- Weight 990 lbs. (shipping) steel shipping crate L=46"x W=36" x H=47"
- 8mm thick steel fly wheel housing
- Easy access fly wheel knife panels
- Adjustable bed knife (to achieve proper knife gap)
- Five (5) Heavy duty cogged drive belts
- Safety stop bar w/reverse
- Horizontal "table height" infeed hopper for easy loading
- Baked on powder coat finish
- Clear vinyl chip baffle
- PTO shaft included (shear bolt protected)(optional Premium shaft available)
- 3 yr. parts warranty
- 90% assembled upon delivery.



WoodMaxx WM-series wood chippers are the perfect combination of size, weight, and features. Compact enough to easily move around, yet strong enough to get the tough jobs done. WM-series chippers are loaded with features typically found on much larger commercial machines that are much more expensive. The strength of our machines start with using heavy formed Q-235 (American standard A-36) structural steel plate; the strongest plate steel available. Each piece is CNC plasma cut, and meticulously welded. WoodMaxx WM-series chipper exclusive structural design includes a 2" diameter main shaft that passes through the flywheel housing and is supported by 3 bearings: 1 pillow block and 2 flange bearings. This feature, combined with the 2" shaft, allows the flywheel to run true and ads a great deal of strength. This design sets WoodMaxx chippers far apart from the competition, and it is a design feature you should not overlook when shopping for a chipper.


The WoodMaxx WM-8H requires a tractor with a category 1 or 2 three point hitch and at least 19 hp. at the PTO. Of course chipping capacity is directly related to horse power and torque, therefore with 19 hp. you can expect to chip 4" hard and 6" soft material and with 50 hp. you can expect to chip any material up to 8" in diameter with no trouble. In testing a 30 hp. tractor gave excellent work to fuel consumption results. Tractors with more than 50 hp. will not over power or damage the wood chipper since it is shear bolt protected, but will simply consume more fuel to accomplish the same results.


WoodMaxx WM-series wood chippers offer a larger 8"x 8" infeed to easily accept those crooked branches. Other 8" chippers open 8" wide, but only 4-1/2" high.


WoodMaxx WM-series chippers use a 24" dynamically computer balanced 200 lbs. flywheel to run smooth and deliver the energy to easily chip all types of material. Competitors use a wide range of flywheel weights, but through thorough testing and experimentation, WoodMaxx has discovered that the 200 lbs. flywheel is ideal for this size of wood chipper.


All WoodMaxx WM-series wood chippers are equipped with made in USA knives and made in USA Holo-Krome class 12.9 knife bolts. Designed for extreme duty - there is no better material that can be used for superior life and performance than our heat treated, through hardened, high carbon, high chromium, A-8 tool steel knives.


WoodMaxx WM-series wood chippers come standard with reversible dual edge knives installed. This means you get twice the work out of one set of knives! These knives are bolted into a milled pocket in the flywheel, incorporating a new flywheel pocket design developed at WoodMaxx. Unlike most other reversible knives, which are only held on by bolts, the flywheel on the WM-series chipper was redesigned to actually help to hold the knives on. This eliminates knife and bolt breakage that can be found on other dual edge knife systems. And, as always, these knives are made right in the USA of hardened, high carbon A-8 tool steel, right here in upstate New York. Click here to learn how long your chipper knives will last.


WoodMaxx WM-series wood chippers are now equipped with a convenient tachometer/ hour meter. The tachometer allows the operator to see the actual RPM of the flywheel to ensure that the chipping head is running at the optimal recommended speed. Proper flywheel speed is important to develop the inertia required to chip hard material and evacuate the chamber effectively. The hour meter is helpful to ensure that proper maintenance intervals are kept in accordance with WoodMaxx recommendations. This all-weather meter is water proof and weather tight.


WoodMaxx WM-8H chippers are complete with a self-contained hydraulic pump and a 38L (7) gallon reservoir tank to power the two infeed motors. Hydraulics are not required from your tractor. Hydraulic motors are a standard SAE 2 hole "A" mount. What does this mean to you? Down the road if there is a need to replace the motor, it can be found just about anywhere. Please note, you will need at least 19 horsepower at the PTO to operate this machine.


The WoodMaxx WM-8H wood chipper utilizes JIC (joint industrial council) hose fittings and hoses rated for 5000 psi. For you this means that if you ever need to replace a hydraulic hose, that your local tractor supply or auto parts store can make hoses while you wait. JIC fittings are widely used in hydraulic fluid transfer, the military, and are typically very easy to come by. No trying to chase down an adapter because of mismatched threads.


The hydraulic hose configuration for the WM-8H has been streamlined to eliminate the possibility of snagging a hose and offers a sleek new look.


Along with the new hose configuration, the WM-8H now includes the additional protection of nylon hydraulic hose wrap for long life. This hose wrap reduces chaffing and protects the hoses from environmental damage.


The addition of this valve allows for very precise infeed roller speed without causing back pressure on the hydraulic pump. This allows the user to regulate the speed of the infeed rollers to exactly match their tractors capabilities while increasing the life of the hydraulic pump.


Variable speed (10-75 ft./min) aggressive dual counter-rotating hydraulic powered infeed rollers work together to pull material into the chipper head. This feature allows the user to slow the infeed speed down to accept large material.


Another WoodMaxx exclusive! Designed by WoodMaxx, copied by others. We all know what happens to the branches when they reach the flywheel, but getting the material to pull into the chippers quickly and effectively is the trick. Many factors come into play when designing an effective infeed roller: the overall diameter, blade spacing, tooth angle, type of steel, hardness, down pressure and speed. After countless hours of research and development on the infeed system, we have developed a large diameter (6.25") infeed roller that easily climbs up and grabs the branches to bite in and efficiently pull the material into the flywheel at up to 75 ft./min. The larger the roller, the easier it rolls over the material. The smaller the roller, the more likely it is to slip and spin on the branches. We equate this to the small wheels of a shopping cart stopping when it contacts a small stone in the parking lot. WoodMaxx auto feed chippers utilize infeed rollers with high carbon steel chisel teeth. This type of infeed roller is found on larger, much more expensive machines.

We have also spaced the teeth out to prevent material like leaves and bark from getting impacted between the teeth. This allows the roller to self-clean, and also allows the 165 lbs. of down pressure to focus on fewer teeth which increases the bite. These rollers, along with the high tension springs aggressively bite into any type of material. After welding, these rollers are induction hardened to ensure that the teeth stay sharp for many years to come. The advantage of this type of roller is that is aggressively grabs any size limb up to 8" with or without leaves. Small, vine type material as well as long or short needle pine is no problem for the WoodMaxx WM series chipper. Vines, leaves, and small branches won't wrap around the roller as they would on other chippers. The advanced design of our infeed rollers is a feature that should not be overlooked when shopping for a wood chipper. Our infeed roller designs are so effective and unique that we now have patents pending.


All WoodMaxx WM-series chippers are category 1 quick hitch compatible. WoodMaxx is the only PTO chipper that works with quick hitch (**John Deere I-match/Land Pride QH10 require a special top link that we make for this purpose, please call to specify if you need this). Save time by never leaving the seat of your tractor to link up with the WM-series wood chipper. Attaching the chipper to your quick hitch takes only seconds. Please note, you'll need the Premium PTO shaft or a longer imported PTO shaft if you have a quick hitch (contact us for more info). Check out our video tab to see the quick hitch in action! No quick hitch? No problem. The chipper will easily attach to a standard 3pt hitch, just back in and insert the pins. No need to force the draw arms of your tractor around the draw pins (as with many other implements).


360 degrees of rotation and two finger operation. We have incorporated a convenient handle that effortlessly allows you to swivel the discharge chute so that you can direct the chips into the back of a truck or trailer without having to move the entire machine. Simply push down on the handle and swing the chute. When you release the handle a spring loaded pin drops down to lock the chute into position. No tools required.


Because of its robust weight and to prevent the machine from sinking into the soft ground during operation, the new WM-8H offers a wide footprint skid type support base. This base is angled upward on the end to prevent digging into the ground while transporting.


The automatic belt tensioner on the WM-8H hydraulic pump drive belt keeps consistent pressure on the belt. If the drive belt is too tight then excessive bearing and or pump failure is likely, too loose and the belt will slip. This feature eliminates the need to adjust the belt, ensures that proper tension is achieved, and increases the longevity of the pump and bearings. Also saves you the hassle of constant adjustment.


You asked for it and we delivered! In 2012 WoodMaxx developed the first adjustable chipper base legs. These adjustable legs will help accommodate a larger variety of tractors. This innovation allows you to more easily meet the required PTO shaft angle (less than 15 degrees) on larger tractors. Simply insert the adjustable legs, and then slide the pin into the hole for your required leg height. WoodMaxx wood chippers are able to accommodate tractors that have a PTO height from 18" to 30" high.


WoodMaxx WM-series PTO wood chippers incorporate a series of precisely located ventilation holes in the flywheel chamber. This feature creates a strong vacuum that draws air into the flywheel chamber and in combination with the fan blades on the back of the flywheel forcefully ejects the chips out of the chamber. This keeps the discharge chute clear, and reduces the chances of a jam. The WoodMaxx patent pending hole pattern is specifically designed to bring the air into the chamber at the optimal volume and location. Other machines have tried to copy this feature, but have not achieved the same results!


Three heavy duty cast steel bearings support the main shaft, which passes through the flywheel housing, and is supported on either side by flange bearings. This heavy duty, shock resistant cast steel bearings are much more durable than cast iron - a unique feature of the WoodMaxx chipper.


The 2" main shaft on the WM-series wood chipper passes through the flywheel housing and is supported by 1 pillow block and 2 flange bearings. This feature, combined with the 2" shaft, allows the flywheel to run truer, and adds a great deal of strength. Other chippers use a 1-3/4" shaft, 2 pillow block bearings, and the flywheel is cantilevered beyond the bearing. With this setup, there is a possibility of breaking a bearing housing the machine jams.


The WoodMaxx WM-series chipper utilizes high tension springs in conjunction with a unique adjustment mechanism that offers a full range of variable down pressure, since all branches are different - some soft and some hard. This feature allows the user to increase to decrease the upper roller down pressure to suit the situation. Crank up the tension to achieve up to 165 lbs. of down pressure. This allows the teeth on the roller to dig into the branches and ensure a smooth entry into the chipper head.


WM-8H... 990 lbs. (shipping) steel shipping crate L=46" x W=36" x H=48"

More weight = more steel

More strength and stability... period.


WoodMaxx WM-series wood chippers use heavy gauge 8 MM thick Q235 (American Standard A-36) structural steel plate for the flywheel housing. Since the flange bearings are mounted on the flywheel housing, this gives added strength and rigidity. Other chippers use only 1/4" steel.


WoodMaxx WM-series chipper knives can be changed from the side of the machine by one person in as little as 10 minutes. Other chippers require you to reach into the infeed bin to hold the head of the bolt, while someone else turns the nut from the backside of the flywheel.


WoodMaxx WM-series wood chippers are equipped with an adjustable bed knife to ensure that the proper knife gap is achieved. This feature allows the user to adjust the distance between the flywheel knife and the bed knife so that the required distance is maintained after knife sharpening. Proper gap is important so that even the smallest material is chipped as it passes through the chipper.


WoodMaxx WM-series chippers are equipped with extreme duty 5/8" wide cogged drive v-belts. Cogged v-belts run cooler, and transfer more torque than plain smooth v-belts. Although the OEM belts are very high quality, if the need arises, the standard BX size allows you to purchase replacement v-belts at any auto parts store. Other chippers use 15 mm belts - try to find those in the USA!


Safety is paramount on WoodMaxx chippers. Located on the top of the infeed bin, the WM-8H utilizes an easy to activate hydraulic auto-feed stop safety bar to disengage the infeed rollers in case of an emergency, or to clear the infeed bin if necessary. By simply pulling down on the bar, the user can stop and even reverses the direction of the infeed rollers.


This feature allows the user to access the handle from either side of the machine. The center lift point allows the WM-series chipper to use stronger tension springs, increasing the infeed ability.


The infeed hopper on the WM-series wood chippers is horizontal and approximately table height for easy material loading.


The powder coat finish is baked on at 450 degrees, and is thicker and more durable than ordinary paint.


The clear vinyl baffle feature protects the user from chip blow-back, while allowing the user to see what is going on in the hopper.


This robust chipper comes with an equally robust 3 year warranty. Our service department also stocks a full line of replacement parts.


WoodMaxx wood chippers include a standard PTO shaft, but for an additional $135.00 upgrade charge, we do offer a very high quality Premium PTO shaft. The Premium shaft retails for $250 if purchased separately from the machine. Have a quick hitch? The Premium shaft is compatible, or ask about our longer imported PTO shaft.


WoodMaxx chippers come shipped to you in a steel crate and are almost completely assembled. Simply attach the infeed bin, discharge chute, PTO shaft (included), and attach to your tractor. All WoodMaxx chippers are given a comprehensive 22 point inspection, and are serviced prior to leaving our warehouse. The drive belts have been aligned and tightened, knives have been installed, adjusted, and torqued down, and bearings have been greased. These and other steps performed here greatly reduce assembly time on your end. Just follow the illustrated, American written, user friendly assembly manual (and watch the video), and you will be up and running in about 2 hours.


WoodMaxx 3-pt. hitch mounted wood chippers are extremely robust, and can handle heavy use. Designed in upstate New York, each machine we offer is thoroughly tested on our 18 acre proving grounds before being offered to the public. With years of experience and thousands of machines in service today, we are confident that this machine can handle even the toughest projects that you have. Our machines are currently in service in several commercial applications, such as: the Army Corps of Engineers, college campuses, municipalities, tree farms, golf courses, apartment complexes, and thousands of residences. WoodMaxx chippers are also represented around the globe, with machines as far away as Hawaii, and Alaska, as well as several countries including: Chile, Russia, Panama, Colombia, Poland, United Arab Emirates, Israel, west Africa, Greece, Norway, Iceland, Ecuador, Honduras, Ireland and of course Canada.


Do not be fooled by imitators. WoodMaxx is the original chipper of this design. We have spent hundreds of hours designing and testing to create this machine, and utilize the best components available. There are some copies of the WM-8H on the market, but if it does not say "WoodMaxx" it is not the same machine. WoodMaxx offers the highest level of quality and innovation with many exclusive features not found anywhere else. Cheap knock-offs do not have the quality workmanship and history of satisfied customers that WoodMaxx has. Additionally, WoodMaxx warranty and replacement parts do not apply or fit on copied machines. Just compare our reviews to those of the competitors, and you can see for yourself!


At WoodMaxx our service department is staffed with professional certified technicians that inspect each machine before it is shipped. This ensures that you get a trouble free machine from the get go. When you need technical help or parts, our courteous staff can help you get what you need from our fully stocked warehouse.

California Residents See Prop 65 WARNINGS

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(WM-Series) USA 3-pc. Knife Set (Flywheel & Bed Knife) (Reversible Dual Edge) 2013-Current (WM-Series) USA 2-pc. Flywheel Knife Set (Reversible Dual Edge) 2013-Current (WM-8H) USA Complete Replacement Kit Premium PTO Shaft Upgrade




(WM-Series) USA 3-pc. Knife Set (Flywheel & Bed Knife) (Reversible Dual Edge) 2013-Current (WM-Series) USA 2-pc. Flywheel Knife Set (Reversible Dual Edge) 2013-Current (WM-8H) USA Complete Replacement Kit Premium PTO Shaft Upgrade
Standard PTO Shaft - (Included with machine) Quick Hitch - Category 1


Standard PTO Shaft - (Included with machine) Quick Hitch - Category 1

Average Customer Review: Average Customer Review: 5 of 5 5 of 5 Total Reviews: 262 Write a review.

  0 of 0 people found the following review helpful:
5 of 5 WM-8H review September 27, 2021
Reviewer: Dave Workman from St. Paul, Minnesota  
I've had my WM-8H for several years and couldn't be happier with it.
Haven't had any trouble at all.  Got more than 100 hours on it.
We have 20 acres, half woods, this machine has the oomph to get the job done.
I did replace the hopper bolts with carriage bolts so the heads are smooth, and turned them smooth side in, so branches don't catch on them.

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  0 of 0 people found the following review helpful:
5 of 5 WM-8H September 8, 2021
Reviewer: Thomas Andrews from Sanborn, NY  
Put my new WoodMaxx 8H today and it has exceeded my expatations. The workmanship is excellent and the owners manual is well written. Put it thru it’s initial paces and it worked fine. I live in the woods with a lot of dead Ash  and this chipper will save me from burning the brush.

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  0 of 0 people found the following review helpful:
5 of 5 WM-8H August 25, 2021
Reviewer: joe from ohio  
The chipper works great!  I have used it twice so far and it is so fast that with two of us feeding branches, we only have about an hour time on it.  It makes quick easy work of even the hardest dry branches.  Time will tell its durability, but it certainly works well and seems really well built.  It runs smooth and relatively quiet when no wood is in it; but once it gets hold of a big branch it really snarls and chews it up!

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  0 of 0 people found the following review helpful:
5 of 5 Wonderful Machine July 30, 2021
Reviewer: Doug F. from Rochester, NY  
Can't wait to show off my WoodMaxx Hat and Shirt. Wonderful machine WM-8H. This thing is very well built!

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  1 of 1 people found the following review helpful:
5 of 5 WM-8H Review July 22, 2021
Reviewer: Stan Bishop from Elkton, VA  
The chipper was delivered by a freight company.  The WoodMaxx WM-8H is HEAVY.  At 990# I could barely get it off the trailer with my tractor and forks.  So just be prepared.  I don’t think a subcompact tractor could handle it.

I took my time uncrating and assembling the chipper.  The instructions were excellent.  They come in a booklet with glossy color pictures.  Not the loose-leaf photocopied directions I’m used to seeing with items from China.  The hardware included was all there.  The instructions could have been a little more specific about where to use washers.  It’s pretty much two washers for almost every nut/bolt combination.

Of all the tools listed that you will need, they only left out one item.  A telescoping magnetic pickup tool to pick up all the nuts, bolts, and washers that you will drop if your anything like I am.

I filled the hydraulic tank with ISO 46 fluid.  I couldn’t find any ISO 32 but I think what I have will be fine.  After that, I engaged the PTO at idle and then let the chipper run for a few minutes at 1,000 engine RPMs.  Then I shut it off and let it set a few days.

Finally, I got to take it out back to chip up a brush pile of cedar, wild cherry and sassafras.  The brush pile was dry having laid there since late March or early June; it’s early July now.  I set the hydraulic flow control to 5.  I cut some more cedar branches and mixed them in with the dry.  I chipped brush up to 4” thick and the chipper and tractor never missed a beat.  I didn’t even hear the tractor slow down; it’s 37 HP.  Pretty much anything bigger than 4” gets cut (& split) for my wife’s firepit so I may never get to try anything bigger.

It’s too hot to use much right now but I’m really looking forward to doing some cleanup this fall.  If you eliminate the time spent for assembly, I figure I save 4% of the cost of renting a chipper for 4 hours plus 2 hours saved picking up and dropping off.  With the use I have in mind, I think it will have paid for itself within 2 years.

Overall, I couldn’t be more pleased with my choice.  I would definitely recommend this chipper to anyone else provided your tractor is big enough.

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