
WoodMaxx FM-78
$3,209.00
-
Compatible Parts
-
$25.00
-
FM-78 / FM-78H Flail Mower Hammer Blade Complete Set, Inc-(22) H-Blades, M14x70 Bolts, Nuts) (2015 -Current)
$341.31 -
FM-78 / FM-78H Flail Mower Y-Blade Complete Set, Inc-(22) Y-Blades, M14x70 Bolts, Nuts) (2015 -Current)
$336.31 -
Quick Hitch - Category 1
$350.00 -
Synthetic Severe Gear 75W-90 Synthetic Gear Lube ( 1 qt.)
$17.00
Product Details
WoodMaxx FM-78 PTO Flail Mower (78″)
30-65 HP Required
Category 1 OR CATEGORY 2 (with optional bushings)
FEATURES/OPTIONS:
- NSK Brand Shaft Bearings
- 79.5″ Overall Width
- 74″ Cutting Width
- Requires 30-65 hp PTO
- 3/4″ – 3-3/4″ Cutting Height
- 1/4″ Structural Q235 Structural Side Plate
- Optional Hammer or Reversible Double Y-Blades
- Reverse Rotor Rotation
- 4.25″ Rotor Tube Diameter
- 13.5″ Rotor Swing Diameter
- 2160 RMP Rotor Shaft Speed
- Blade Speed 128 Ft./Sec.
- Cat. 1 or Cat-2 (with optional bushings)
- Three Total B-Series Gates Super HC Plus Vextra
- Automatic Drive Belt Tensioner
- Bolt-on Replaceable Skid Shoes
- 1-3/8″ 6-Spline with Slip Clutch (included)
- 2 Year Parts Warranty
- Shipping Dims: 82x35x29 (Due to increased gas prices and size/weight of this machine, additional shipping charges may be incurred.
- Shipping Weight: 900 lbs.
NSK BRAND SHAFT BEARINGS
NSK is a leading bearing and motion control manufacturing company founded in Tokyo, Japan in 1916. Today NSK has several plants around the world including England, Germany, USA and Switzerland and by far one the best quality bearings available on the market today. Although these bearings are very costly, we feel that in an application with high load and dynamic forces such as a flail mower that such high quality bearings are required. These bearings are noticeably smoother, quieter, and cooler running than any competitor and far superior to any no-name brand. Some inferior bearings contain plastic interior ball cages that are susceptible too breakage from shock loads. Poor material and tolerances generate excessive heat that translates into premature bearing failure and even belt wear as the heat travel to the pulleys and the belts. All bearings are not created equal, and this is a feature that should not be overlooked when shopping for a flail mower.

CUTTING WIDTH
74″
WEIGHT
710 LBS. (mower weight only) PTO shaft weighs an additional 39 lbs.
HP REQUIREMENTS
30-65 PTO horse power
CUTTING HEIGHT
3/4″ – 3-3/4″ Adjustable to meet various height requirements
DECK PLATE MATERIAL THICKNESS
4 Gauge .25″ structural Q235 roll formed steel for durability.
SIDE PLATE THICKNESS
1/4″ .250″ Structural Q235 roll formed steel for durability.
BLADE TYPES
Hammer or reversible Y-blades. Our hammer blades are 40cr, alloy structural steel. (American standard, AISI/SAE/ASTM steel no: 5140) and forged to a tapered wedge shape to avoid material buildup on the blades. Each blade weighs 1.85 lb. (cast steel is much more durable than cast iron) competitors use flat face blades. Side by side comparison of WoodMaxx exclusive hammer blade design: The reversible Y-blades are made from .33″ 60si2mn, spring steel, (American standard: A29m) formed, heat treated, and quenched in oil and weigh 1.75 lb. each. Use the hammer blades for clearing saplings (1″ diameter or less), and the Y-blades for grasses.

NUMBER OF BLADES
22 Hammer or 44 Y- blades w/ 22 ctr blades between the Y (WoodMaxx exclusive)
PRECISION BLADE OVERLAP
The blades are staggered precisely with no gap in the mowing area. Blade overlap is important to achieve an even cutting result.
HINGED REAR GATE
This allows for easy inspection, cleaning, blade changing, and maintenance of your machine. The rear gate can also be left open for easier discharge in heavy conditions, or you can close the gate to greater mulching.
ROTOR ROTATION - REVERSE
The rotor spins in the opposite direction as the wheels of the tractor when traveling forward. This allows the blades to shear the material as it is folded forward by the mowers. The material is then thrown up and over the rotor.
ROTOR TUBE DIAMETER
4.25″- Heavy duty 5/16″ wall tubing for long life.
BALANCED ROTOR TUBE
The rotor tube is balance to reduce vibration and ensures that the mower runs smooth, and reduces wear on the bearings.
BALANCED CAST IRON PULLEYS
The V-belt pulleys are heavy duty cast iron and balance to eliminate vibration, and run smooth.
ROTOR SWING DIAMETER-13.5"
Large swing so that the blades build required inertia.
ROTOR SHAFT SPEED
2160 RPM
BLADE SPEED
128 ft./sec – High tip speed = efficiency to cleanly cut material
HITCH TYPE
Category 1 standard 3 point or category 1 quick hitch – will attach to any cat 1- 3 point hitch and will also work with cat 1 quick hitch (except John Deere I-Match)
OFFSET FROM PTO CENTER
This feature allows for offset from center to the right of the tractor. This feature is helpful for mowing around fences, buildings; walkways etc. From the center of the PTO the mower extends 46″ to the right and 33″ to the left.
DRIVE BELTS
The WoodMaxx FM-62, FM-62H, FM-78, and FM-78H are equipped with three Total B-Series Gates Super HC Plus Vextra (easy to find SAE standard belt size BX39).
DRIVE BELT TENSIONER
Solid state automatic – this feature automatically adjust the belt tension so you don’t have to worry about slippage or overworking the belts. This feature greatly increases the belt life.
PTO SPEED
540 ONLY
GEARBOX RATING
Up to 55 hp. Heavy duty proven oil bath gearbox for long life.
GEARBOX TYPE
Cast iron 540 RPM with internal over-running clutch – when the PTO shaft is disengaged the built in over running clutch allows the PTO shaft to stop turning while the gearbox and rotor shaft slow down gradually. This is an important feature, without it, the gearbox will slam to a halt when the PTO is disengaged, causing stress to the gearbox and your tractor. This feature should not be overlooked when shopping for a mower.
BOLT-ON REPLACEABLE SKID SHOES
The skid shoes reduce gouging are bolt on so you can adjust or replace them easily when the time comes.
DRIVE-LINE / PTO SHAFT
1-3/8″ 6-spline w/slip clutch.
GREASEABLE SHIELDED BEARINGS
Accessible greasable bearings for easy maintenance.
REAR HEIGHT ADJUSTING ROLLER DIAMETER
5.25″ With tapered ends – this roller contacts the ground to ensure even cutting height. The ends of this roller are rounded to eliminate gouging when turning corners. A scraper bar ensures that mud and debris buildup is cleaned off as you go.
POWDER COAT FINISH
The rust resistant baked on powder coat finish is more durable than conventional paint to keep your machine looking good for years.
SERVICE
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
PRODUCT COMPATIBILITY
10 reviews for WoodMaxx FM-78

Aaron Martinez –
Thanks for the mower! It works great! Had a few bolts come loose and lost but replaced all good 👍🏼 Good quality mower!
Michael Russell –
Just received my mower. It was really easy to assemble. Looks to be very well made. I got the hammers. Due to the brush cutting that i normally do. I cut my overgrown field today and was impressed with the cut quality. Looks like i cut it with a lawn mower.
Richard D. –
The FM 78 is a quality machine through out. Heavy duty construction. It handled a field that I had let get to the hood of the tractor with ease. I am very well pleased.
Steve R –
A few weeks ago I took delivery of the FM-78 Flail mower and I can honestly say that I LOVE THIS THING!!! I was concerned about Chinese quality but Woodmaxx definitely got those guys producing a quality product. I do wish it was made in America so we kept the jobs here but it is what it is. But yeah, this machine really gets it done and it’s a pleasure to use. Mind you, I own a Ferrari and I’m uncertain which is more fun to use/drive! My orchard looks like a manicured park and now all the vines and old plants coming out of my vegetable garden can be dumped in the orchard rows and almost instantly converted to mulch. I love my Woodmaxx flail mower, great product, amazing price, you guys rock!
Tyler –
So far I am impressed at the quality of this mower for the cost. Overall construction is heavy duty. The mounts for the hitch points to the tractor are robust. The structure that bolts on and supports the top link mount has been a weak point for me on other mowers. This one is no thicker, but has three construction features I think will help: 8 bolts instead of 4, a small weldment across the crease at the bottom where the bolts are, and an arch welded across the rear of the structure. In previous experience with flail mowers that used a folded steel design, the steel will actually shear over time with vibration when carrying the mower in the raised position. I’m hopeful the little weld that forms a small triangle will be enough to stop this.
The rear roller is a good size, unlike some competitors. It should roll well and not become clogged and stop turning against the scraper. The driveshaft does have a slip clutch. I like the belt tensioner mechanism. The paint / finish are nice.
D. McNelley –
I received my flail mower in late july/early august of 2018 and have used it in various applications from hay fields to the yard. It has proven to be very effective in all uses with the exception that it does not compost leaves well (this is a joke of course).
If you are going to purchase, the hydraulic shift is priceless.
Timothy Cox –
I was very skeptical about the purchase of a flail mower to start, being that it is so different from the traditional rotary mower. My pasture was well overgrown from the lack of attention. The flail mower did a very good job shredding the material very fine.The quality of the machine looks very good. So far I have mowed about 8 acres with it and I am very pleased with the performance of the WoodMaxx FM-78. I was actually surprised at the quality of finish the mower produces with the hammer blades.
Doug Reeves –
So, I have mowed my pastures for years with a brush hog. 3 solid days of Texas heat listening to my little 35 hp tractor suffer through the process. So one fateful day as I was surfing the web a flail mower popped up. Never heard of such a thing. So after finding one made in the USA I watched 6000 videos over the course of a year. Well, I finally decided that I would give it a spin so I purchased the FM-78. At first, even before it was delivered, buyers remorse set in. I thought about my poor little 35 hp workhorse and what I was about to subject it to. I mean, 29 hp. at the PTO… hello, she just a baby. So the mower showed up all shiny and new and so I sucked it up, cut the PTO shaft (no going back now) and hooked this monster up. Well, this ridiculous mower BLASTED through these pastures in one day!!! BOOM! And on top it that my little 35 hp. powerhouse took it like a champ! Thanks Woodmaxx for such an AWESOME product!
Paul Badour –
After much research in the flail mower market, I decided on the Woodmaxx FM-78. It seemed to have all the features of the more mainstream brands but at a much more palatable price point. It arrived in a sturdy metal shipping crate and the only assembly required was attaching the top link bracket with 8 bolts, cutting the PTO shaft to length and attaching it to the gearbox. It was greased, oiled, and ready to use. I hooked it up to my JD 4500 (39hp) and proceeded to mow a 3′ tall hayfield. It cut through the Michigan grasses easily and left a trail of mulch. This mower is performing to my expectations and I consider it a good purchase.
Anonymous –
Wanted to switch to a flail mower in place of my finish mower & brush hog so I didn’t have to switch back & forth. Had made up my mind to buy a Caroni, but learned that they were out of stock until January (4-5 months?) Did additional research & learned that WoodMaxx was now offering a flail. I know their reputation on chippers & snowblowers, so after thinking it over I placed the order for an FM78. I got excellent support and clear communications in the order & delivery process, and within 3 weeks had the new mower delivered, assembled (minor assembly), and running. I’ve only run it for a few hours but am very impressed with the construction quality and the performance. The offset is very handy and the belt tensioning system is excellent vs. competitive models. Thanks to Amanda and the rest of the staff at Woodmaxx for a great product and just as importantly, for making the order & delivery process very easy. Looking forward to putting a lot more hours on this in the future.