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MX-9900 Hydrostatic Auto-Feed Wood Chipper
MX-9900 Hydrostatic Auto-Feed Wood Chipper

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Product Code: MX-9900


Description Warranty Information



WoodMaxx Patented MX-series wood chippers are designed, engineered and manufactured in the USA at our Akron NY facility. With a multi-million dollar investment in the latest high-tech fabricating equipment to increase production, WoodMaxx MX-series Wood chippers are in high demand. Due to high demand, please call for current production time.


- Proudly Made in the USA!!!
- USA and International Patents, additional Patents Pending
- 25 Minimum PTO horsepower
- 3-pt. hitch mount - fits cat 1 or 2, and also cat-1 quick hitch
- 100% assembled upon Delivery
- 220 lb. 26.5" Diameter Flywheel
- Made in the USA knives
- Four (4) reversible chipper knives (offset)
- Self-contained hydrostatic infeed drive system (patented)
- Requires only 2 quarts of oil!!!
- 1200 RPM Flywheel speed
- NEW (2016) Tachometer/ Hour meter (to ensure proper flywheel speed)
- Fold up infeed bin
- 9" x 9" infeed opening
- 3/8" thick structural steel blower housing
- Easy knife access
- 5 cogged V-belt drive
- Safety stop bar/speed & direction control bar
- Hinged infeed hopper
- Skid type support base
- Strength in design
- Experienced (WoodMaxx is North America's #1 PTO wood chipper supplier)
- 8" Diameter infeed roller
- 360 degree swivel discharge chute
- Automatic pump belt tensioner
- Adjustable base legs
- High flow flywheel chamber ventilation
- JIC hose fittings
- Industrial grade bearings
- High tension gas springs
- Weight 1000 lbs.
- Baked on powder coat finish
- Clear vinyl chip baffle
- Sleek hydraulic hoses w/nylon hose wrap
- PTO shaft included (shear bolt protected) (optional Premium shaft available)
- 3 yr. warranty
- WoodMaxx original patented


The WoodMaxx MX-9900 hydrostatic auto-feed chipper is a robust self-feeding PTO wood chipper. This wood chipper is extremely compact, and built to withstand commercial use. The hydrostatic drive system infeed roller will grab and pull material into the chipper head using a powerful hydraulic motor. This motor is powered by the chippers self-contained hydrostatic pump and reservoir. Four (4) High quality (A8 tool steel) made in the USA knives are standard equipment on all MX-series wood chippers. The design of the WoodMaxx MX-series chipper is so unique and innovative that it is now patented.


The WoodMaxx MX-9900 wood chipper comes shipped to you in in a wooden crate and is 100% completely assembled. Simply attach the MX-9900 wood chipper to your tractor, lower the infeed bin, raise the discharge chute, size and attach the PTO shaft (included), and fill the oil reservoir with 2 quarts of 10-W40 motor oil. The WoodMaxx MX-9900 wood chippers is manufactured and assembled right here at our facility and are given a comprehensive 22-point inspection, and is serviced prior to leaving our warehouse. Simply follow the user-friendly operator manual and you will be chipping in no time at all.


WoodMaxx MX-9900 wood chippers use a 26.5" dynamically balanced 220 pound flywheel to deliver the energy to quickly and 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 220 pound 26.5" flywheel is ideal for this size wood chipper.


All WoodMaxx MX-series wood chippers are equipped with made in USA chipper 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 performance and life than our through hardened, heat treated, high chromium, high carbon, A-8 tool steel knives.


The WoodMaxx MX-9900 wood chipper comes standard with four offset reversible dual edge knives installed. Thats right, four knives, and they are offset so that every 90 degrees of rotation the knife is taking a slightly different cut of the material. This is equivalent to using a serrated knife to cut bread instead of a straight knife. Ultimately, this feature allows for chipping large material without overworking your tractor. The reversible knives mean that you get twice the work out of one set of knives! These American made knives are securely bolted into a pocket that is milled in the flywheel using American made Holo-Krome bolts for added security, this design utilizing a new flywheel pocket design developed by WoodMaxx. This eliminates knife and bolt breakage that can be found on other dual edge knife systems. These knives are made right here in upstate New York of hardened, high carbon A-8 tool steel.


The WoodMaxx patented design MX-9900 wood chipper is complete with a self-contained hydrostatic pump that requires only a two quart oil reservoir tank to power the infeed motor. Unlike a standard hydraulic system, a hydrostatic drive system is so powerful that it is the same type of drives system that is used to drive bulldozers, trains, excavators, skid steers, and even ride on lawn mowers. This hydrostatic system uses standard 10W-40 motor oil and is so efficient, and generates so little heat, that it requires only a fraction of the reserve oil as a standard hydraulic drive system. This type of system also allows for complete speed control from 1 RPM to a full 75 ft./min. with full power through the entire speed range. The Hydrostatic drive system on the WoodMaxx MX-9900 is so unique to the industry that it is now Patent protected. Hydraulic remotes are not required from your tractor. The hydraulic infeed motor is a standard size 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 25 horsepower at the PTO to operate this machine.


WoodMaxx MX-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 MX-series wood chippers are equipped with USA "DanFoss" brand hydraulic infeed motors. DanFoss is renowned for their high-quality American engineered hydraulic motors.


The WoodMaxx MX-9900 PTO Wood chipper attachment is equipped with a fold up infeed bin. This feature allows the user to simply fold the infeed bin upward for storage or transport.


The WoodMaxx MX-9900 wood chipper offers a larger 9" x 9" infeed opening to easily accept those crooked branches. This is the largest infeed opening available of any PTO wood chipper in its class.


The WoodMaxx MX-9900 PTO wood chipper is manufactured using heavy gauge 3/8" thick (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 MX-series wood chipper knives can be changed easily by one person in as little as 10 minutes. The entire top of the blower housing opens like a clam shell. This allows for easy access to the flywheel and knife changing. 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 MX-series wood chippers are equipped with five extreme duty 5/8" wide cogged drive V-belts that are made specifically for WoodMaxx. 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 size BX belts allows you to purchase replacement v-belts at any auto parts store. Other chippers use 15mm belts - try to find those in the USA!


Safety is paramount on WoodMaxx wood chippers. Located on the top of the infeed bin, the MX-9900 utilizes an easy to activate hydrostatic auto-feed stop safety bar to disengage the infeed roller in case of an emergency, or to clear the infeed bin if necessary. Simply pull the bar forward to increase the speed, and push it forward to decrease or reverse the infeed speed and direction. The hydrostatic drive system is so refined that the infeed speed is fully adjustable from 0-75 ft./min.


All wood chippers will require some routine maintenance like adjusting the gap between the bed knife and the flywheel knives as they wear. This gap is essential to proper operation of the wood chipper. The infeed hopper on the WoodMaxx MX-9900 swings open to expose the bed knife. This feature allows the user to access the bed knife (anvil) by opening the hopper to expose the knives. Simply remove 2 bolts and the hopper will swing open like a door. This feature is exclusive to WoodMaxx, other chippers require the user to crawl into the infeed hopper to change the bed knife or adjust the gap between the bed knife and the flywheel knives.


WoodMaxx MX-9900 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. MX-series chippers are loaded with features typically found on much larger commercial machines that are much more expensive. The strength of our machines starts with using heavy formed (American standard A-36) structural steel plate, the strongest plate steel available. Each piece is laser cut, on a precision CO2 laser and meticulously welded by highly skilled American welders. WoodMaxx MX-series chipper exclusive structural design includes a 2" diameter main shaft that passes through the flywheel housing and is supported by two flange bearings. This feature, combined with the 2" shaft, allows the flywheel to run true and adds 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.


WoodMaxx MX-9900 wood chippers are extremely robust, and can handle very heavy use. Designed and manufactured 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, The US National parks service, 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.


A WoodMaxx exclusive and patent pending design. Everyone knows what happens to the branches when they reach the flywheel knives of the wood chipper, but getting the material to pull into the wood chippers effectively and quickly is the trick. Many factors must be considered when designing an effective infeed roller system: the overall diameter, knife spacing, tooth angle, type of steel, hardness, down pressure and infeed speed. After countless hours of research and development on the infeed system, for the MX-8800 we have developed a large diameter (8") infeed roller. This exclusive design allows the chisel shaped teeth of the roller to grab and climb up and over the branches to easily bite in and effectively pull the material into the wood chipper flywheel at speeds up to 75 ft. /min. In short, 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. Similar to how the small wheels of a shopping cart stop when contacting a small stone in a parking lot. WoodMaxx MX-series auto-feed wood chippers utilize high carbon steel chisel tooth infeed rollers. This type of infeed roller is typically found on much larger, much more expensive commercial machines.

To prevent material like tree bark and leaves from impacting between the teeth of the infeed roller, we spaced the chisel teeth out. This spacing allows the complete down pressure of the high-tension gas springs to be focused on one chisel tooth at a time increasing total down pressure. Additionally, this spacing allows the roller to self-clean. These rollers, along with the high-tension gas springs aggressively bite into any type of material. After welding, these rollers are 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 with or without leaves up to 8". Long or short needle pine, as well as small, vine type material is no problem for the WoodMaxx MX-9900 wood chipper. Small branches, leaves, or vines won't wrap around the infeed roller as they would on other wood chippers. The exclusive 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 unique and effective that they are now patent pending.


The WoodMaxx MX-9900 PTO wood chipper is equipped with a 360 degree swivel discharge chute. With easy two finger operation, we have incorporated a convenient handle that effortlessly allows you to swivel the discharge chute 360 degrees so that you can direct the chips into a trailer or the back of a pickup truck 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.


The hydrostatic pump belt tensioner is automatic on the MX-9900 wood chipper. This feature keeps consistent and correct pressure on the drive belt. If the drive belt is too tight then excessive bearing and or pump failure is likely. If it's too loose, 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. It 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. This is a feature that we thought was important to incorporate into the MX-9900. The adjustable base legs will help to accommodate a larger variety of tractors. This innovation allows you to more easily meet the required PTO shaft angle of 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 chippers are able to accommodate tractors that have a PTO height from 18-30 inches in height.


Because of the robust weight of the MX-9900 PTO wood chipper and to prevent the machine from sinking into the soft ground during operation, the new MX-9900 offers a wide footprint skid type support base. This skid shoe type base is angled upward on the end like a ski to prev ent it from digging into the soft ground during operation.


WoodMaxx MX-series 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 wood 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!


The WoodMaxx MX-9900 wood chipper utilizes JIC (joint industrial council) hose fittings that are 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 2" main shaft on the MX-9900 PTO wood chipper passes through the flywheel housing and is supported by two industrial flange bearings. This feature, combined with the 2" shaft, allows the flywheel to run extremely true, while adding a great deal of strength. Competing machines use a 1-3/4" shaft in conjunction with two pillow block bearings, and the flywheel is cantilevered beyond these bearing. With this setup, there is a possibility of breaking a bearing housing if the machine jams.


The WoodMaxx MX-series wood chipper utilizes high tension gas springs. These gas springs maintain the same tension throughout the entire range of motion. This feature also slows and dampens the downward motion of the infeed roller to prevent the infeed roller from slamming downward ultimately increasing the longevity of the components. These high-tension gas springs achieve 175 lbs. of downward force that allows the teeth of the infeed roller to dig into the branches and ensure a smooth entry into the chipper head.


MX-9900... 1000lbs of American made steel!


The WoodMaxx MX-9900 is finished with a powder coating that is baked on at 450 degrees. Powder coating finish is thicker and more durable than ordinary paint. Additionally, prior to powder coating the steel is prepared by shot blasting, (similar to sand blasting but with steel shot instead) which slightly scuffs and textures the steel to provide for a superior bonding surface. This is a more costly process but is superior to simply chemically cleaning the steel as most other will do.


Safety is paramount, therefore the WoodMaxx MX-9900 is equipped with a clear vinyl baffle feature that protects the user from chip blow-back, while allowing the user to see what is going on in the hopper.


The hydraulic hose configuration for the WoodMaxx MX-9900 requires only two streamlined hydraulic hoses. This is possible because of the patent pending upgraded hydrostatic drive system that eliminates many of the components and hoses of traditional open hydraulic systems. This feature makes future maintenance a breeze.


Along with the simple two hose configuration, the MX-9900 includes the additional protection of nylon hydraulic hose wrap for long life. This hose wrap reduces chaffing and protects the hoses from abrasion and environmental damages.


The WoodMaxx MX-9900 wood chipper includes a standard imported PTO shaft, but for an additional $135 charge you can upgrade to 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. FREE upgrade to Premium Shaft for a limited time only.


The WoodMaxx MX-9900 wood chipper comes with a robust 3 year warranty. Our service department also stocks a full line of replacement parts if the need arises.


WoodMaxx is the original chipper of this design. After hundreds of hours spent designing, testing, and research and development to create this wood chipper, WoodMaxx offers the highest level of quality and innovation with many exclusive features not found anywhere else. With the highest quality of workmanship and history of satisfied customers that WoodMaxx has, we are confident that you will be completely satisfied with this machine. 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. We keep a full line of replacement parts, and guarantee that we can ship any part within 24 hours .

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Average Customer Review: Average Customer Review: 5 of 5 5 of 5 Total Reviews: 22 Write a review.

  1 of 1 people found the following review helpful:
5 of 5 MX9900 January 24, 2020
Reviewer: Ted Bumbalough from Knoxville, TN United States  
Ordered the chipper on Wednesday and it shipped on Friday and I received it on Tuesday. Once home the machine was uncrated and parts kits removed and inventoried and everything I had ordered was there. The assembly, what little was required was completed. I found a couple bolts needing tightened but nothing major. I did find the legs did not go down far enough to get the 15 degrees needed with chipper on the ground so I will have to modify the bottom of the shipping crate to raise it enough to get the required angle. I was under the impression the feet could be lowered to get up to a 30 inch height, but I did not find that to be the case with my machine. After I got it put together ran it according to instructions and then ran some limbs through machine and it chipped them easily. So far I am extremely satisfied with the machine, the way it operates, and the ease of dealing with Woodmaxx.

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  1 of 1 people found the following review helpful:
5 of 5 Excellent machine January 22, 2020
Reviewer: Jeff Woodard from Wast Palm Beach, FL United States  
I paired my new MX-9900 with a Kubota L3901 and am VERY happy with the result. It took me a while to shorten the PTO shaft as the book instructions were for a little different style than the one I received, but once I figured it out it was quite simple.  My first full day using it, it ate through a huge pile of earleaf acacia, Brazillian pepper, cabbage palm leaves, and Shefflera trees. It didn't do a great job with a saw palmetto, trunk, as it tends to shred more than chip.  I was able to make a nice, neat pile of mulch much faster than I could have stacked it on a trailer and hauled it to the curb.

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  1 of 1 people found the following review helpful:
5 of 5 MX-9900 Rules! January 22, 2020
Reviewer: Howard Hall from Kamuela, HI United States  
Awesome machine, well designed and well built. Love that it is American Made, through and through.  We are chipping Olive trees, Citrus (Lime), Pepper Trees, Banyan, Eucalyptus, and coffee.  The hydro static feed, the heavy flywheel, and the four cutting blades (rather than the usual two) handles the most twisty and branchy material as well as large diameter logs.  Very satisfied with this purchase.  We are in Hawaii and we use this WoodMaxx MX-9900 chipper year round with our Massey Ferguson 1433 tractor.

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  1 of 1 people found the following review helpful:
5 of 5 9900 MAXX August 20, 2019
Reviewer: Timothy Terriere from Magalia, CA United States  
A very nice addition to the implement shed.  All the good things previously mentioned by the other raters is true. What a great machine, we are cleaning up our five acres after a wild fire, and this eats the dead trees and limbs and spits them back to the forest with speed. worth any wait . Good Job Wood Maxx

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  1 of 1 people found the following review helpful:
5 of 5 WOODMAX 9900 May 20, 2019
Reviewer: Sam from Fort Jones, CA United States  
Got my 9900 up and running behind a J D 3038E.
Had a a little problem cutting the drive line down, there wasn't much room between the PTO and the chipper input shaft. But it worked out.
This machine is AWESOME!
I am chipping Manzanita that has been down for 2 plus years, it's hard as nails. I'm chipping 4" - 5" branches that will dull a saw chain.
I'm also chipping Black oak, Live Oak and Pine.
I have run a-lot of commercial chippers.
For the money, I would recommend the 9900 to anybody looking for a chipper with horse power to power it.
My New Favorite Toy!   Sam

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