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MechMaxx 78" Heavy Duty PTO Flail Mower with Hydraulic Side Shift

$4,099.00

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Description

Clear large fields, roadside areas, and overgrown vegetation with the KDK78H 78" heavy‑duty PTO flail mower featuring hydraulic side shift, an automatic belt tensioner, and a robust 3‑point linkage for stable, wobble‑free operation. This mower is built for farmers, landowners, and municipal crews running 50–85 HP tractors who need wide‑cut efficiency, precise height control, and reliable performance in tough mowing conditions.

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UnionBuilt Supply is an authorized dealer of MechMaxx. All manufacturer warranties are honored.

MechMaxx 78" Heavy Duty PTO Flail Mower with Hydraulic Side Shift

The MechMaxx 78" Heavy Duty PTO Flail Mower provides a mid‑width option for tractors that need a balance between maneuverability and cutting coverage. Its hydraulic side‑shift feature helps operators reach edges, fence lines, and offset areas without repositioning the tractor as often.

The mower’s reinforced deck, rotor, and flail layout support routine vegetation management in fields, orchards, and large properties. The 3‑point hitch and PTO drive connect directly to compatible tractors.

Fits Category I/II 3‑Point Tractors

Product manual (PDF)

Download PDF
78-Inch High-Efficiency Mower
78-Inch High-Efficiency Mower

This mower features a 78-inch working width and is suitable for 50–85 HP tractors. Equipped with a CAT 2 three-point hitch, it can be easily attached and provides stable operation across various working conditions, enhancing both efficiency and ease of use.

Flexible side offset design
Flexible side offset design

Connects to the tractor via hydraulic hoses, with hydraulic side-to-side control allowing horizontal movement up to 13.4 inches. Adjustable cutting direction enables easy trimming of distant overgrown areas.

CMR Gearbox
CMR Gearbox

High-quality CMR bearings from Italy efficiently transmit power to all key components of the machine, ensuring smooth and reliable operation, reducing wear, and enhancing both lifespan and efficiency.

Outside Rotor Bearing
Outside Rotor Bearing

Externally mounted bearings allow easy maintenance and repairs. High-quality Swedish SKF shaft bearings handle high loads, run quietly and coolly, ensuring reliable performance.

Openable Back Cover
Openable Back Cover

Features an openable rear cover for easy blade replacement and blockage clearing. Thickened shaft improves mowing efficiency for smoother operation.

Adjustable Height Roller Bar
Adjustable Height Roller Bar

The adjustable height roller bar allows you to raise or lower the cutting height to your desired level, and features a self-cleaning scraper to enhance cutting performance.

  • Assembly & Installation
Product Warranty

MechMaxx 78" Heavy Duty PTO Flail Mower with Hydraulic Side Shift (SKU: 150207) includes a standard one-year manufacturer warranty covering defects in materials and workmanship under normal use.

Product Extended Warranty Plans

Extended warranty plans may be available for select products. Contact us to confirm eligibility and coverage details.

Power Required 50-85 hp Drive Type Gearbox with belt
Minimum Power 50 hp Number of Belts 5
Working Width 78 in Belt Type AV 17*1245
Overall Width 89 in  Drive Blet Tensioner Yes, bolts tightened
Variable Cutting Height 0-3 in Deck Material 0.2 in 
Horicontal Etending Distance 13 in Side Plate Material 0.3 in
With Rear Open Door 2 pcs rear open door PTO Shaft RPM 540 rpm
Blade Number 18 Driveline Shaft Length 39-50 in
Blade Type Hammer Spline End:   PTO Shaft Spline 1.375"  z6
Blade Weight 2.7 lbs 3-Point Hitch CAT 2
Blade Material Cast steel Tractor Mount Three-point hitch
Rotor Bearing SKF Bearing Gearbox 0il Type 85W/90
Rotor Diameter 6 in Dimensions (L x W x H) 89x46x37 in 
Rotor Swing Diameter 16 in  Packing Size  90x38x28 in
Rotor Thickness 0.3 in Finsh  Durable Powder Coated finish
Rotor Shaft Speed 2082 rpm Warranty 1 year
Blade Speed 31.5 mph Net Weight 1160 lbs
Rotor Rotation Clockwise Gross Weight 1307 lbs

WARNlNG: This product can expose you to chemicals including engine exhaust (including diesel engine exhaust when equipped),lead and lead compounds, mineral oils, soots, phthalates, and carbon monoxide which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Certain specification(s) are based on engineering calculations and are not actual measurements. Specification(s) are provided for comparison purposes only and are subject to change without notice. Specification(s)  for your individual equipment will vary based on normal variations in design, manufacturing, operating conditions, and other factors.

  • 5 stars: 24 (86%)
  • 4 stars: 4 (14%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
K
Kate

We purchased this attachment to hook onto our tractor to assist us with mowing the deep part of the ditches. Works great for what we need it for. We would recommend.

B
Brandon

My first MechMaxx product was a stump grinder, 5 star item! It's simple, and simply works.

This offset flail mower seems to be built nice and heavy duty! I spend a little over a week going back and forth with customer service in regard to the gearbox, which seems to have just been a waste of my time. I'm guessing the gearbox is the same as on their standard flail mowers, which are always horizontal. If you look at the location of the vented fill plug while keeping in mind that the offset flail mowers are advertised for vertical use, think about what this vented fill plug is going to in the vertical position.... Yep, it's going to loose gear oil!

According to MechMaxx this is normal and isn't a problem. I disagree.

T
Tom

Good customer service. Takes a couple of days to get responses to questions about shipping timeline and updates. It also took a bit longer to leave their warehouse than I expected. I think 3 weeks. The unit its self is built like a tank. It mulches brush about 3" in diameter if you can get it to feed into the mower correctly and not just fold it over. Some times it takes a few passes for larger stuff. Still faster and less effort than a chainsaw. Grass and small brush is no problem for it. I am operating the mower with a JD 4300 30hp tractor. It does a nice job. very smooth and quiet unit. I have had a small leak on the unit since new. Drive shaft housing, belt side seal leak. It is a very slow leak, so not a deal breaker. I figure it is a compromised seal from the factory. I would buy this unit again.

K
Kevin

Once installed and hooked up, this machine works pretty good. I have it on a subcompact LS MT125, and it handles it fine. The reason for 4 stars is a few things.

First, there was a cylinder pin missing from shipping that took a couple of phone calls and emails to finally get that sent to me. The people were friendly and good to work with, and I got the pin in about 10 days.

Second, I called to ask if the machine came with the hydraulic control levers, and was told that it did. Well, it does not. SO unless your tractor has the levers and connections to control an implement, you will need to spend another $300-$400 on parts to build your own. Do some research on hydraulic fittings and sizing.

Third, the driveshaft cover at the U-joint didn't survive the maiden voyage due to the angle that it reaches when the mower is fully extended. I don't know what the fix is here, but it does not affect performance.

Overall, I am happy with my purchase and this mower will serve me well for years to come. It seems built well. I appreciate MechMaxx bringing a more affordable option to the market.

J
JEFF H

I placed my order in late spring of 2024. Quickly received feedback that the NAM60 was on backorder and I could either receive a refund or if I waited I would receive a small discount. I chose the discount and waited several months. Mechmaxx was quick to respond to my inquiries about my order. Once my order arrived in the states and cleared customs in October, I received shipping information including tracking information. The order arrived at my house within a few days. The mower was shipped in a metal "cage" that was shrink wrapped. Some shifting of the mower had occured, but no damage was observed. The metal "cage" was easily disassembled with a few wrenches - no cutting required. It took about an hour to assemble the 3 point assembly and add the proper fluids. The mower is structurally very solid with visually good welds. I have used the mower for clearing some vegetation including honeysuckle.
Although I had to wait a long time for my order, I am overall very pleased with my purchase. The only negative I have found so far is that the mower is not quick hitch compatible. However, after some bolt on modifications I now use mine with a quick hitch. Looking forward to purchasing the Mechmaxx PTO stump grinder withy budget allows.

M
M.McCoy

Hi this my first project with this flail mower as you can see it did a great job, the mower cuts through thick brush pretty well and it's fairly quiet.I like the fact it doesn't have a wheel in rear like a bush-hog that allows to drop it down in the ditch bank.

C
C.Thor

Shipping was fantastic. The Flail was very nicely secured. The Flail was exactly what we needed for raw land. I am amazed at the quality and have really enjoyed using this thing. Best purchase ever!

W
Wesley T

Was looking for an affordable flail mower for my bx23s. This thing really surprised me with how well it cuts and how big of things it'll cut. Came packaged in a nice metal crate as well which was a pleasant surprise. So far it's been nothing but great for me and my small brush removal business. Added some before and after pics of things I've done with it. Would defiantly buy one again.

R
Raymond M

Shipping was fast comes in its own metal crate not a wooden pallet. Removed it and hooked it up to my tractor to get an driveshaft measurement. I had to shorten it 12'' but not a problem if you have the proper equipment. Added the gear oil in gearbox and drive tube. Finally I aligned it all up made a practice mow. Everything worked great and I am very happy with it. It appears to be well built and feel with the recommended maintenance it will last a long time.

T
Timothy C

The 540 RPM speed is consistent and reliable. No weird vibrations through the 3-point linkage.

F
Frank H

The mulch is rich in nutrients and helps my grass grow back thicker. It’s much better than a standard rotary cutter.

M
Mary J

Very satisfied customer here. The machine is reliable, efficient, and surprisingly easy to maintain.

T
Thomas N

Arrived in perfect shape. Assembly was simple.

R
Ronald M

Customer service was great, answered all my PTO questions.

A
Alexander M

Great for the wooded areas behind my barn.

M
MICHAEL M

Cuts ditch banks far better than my rotary cutter ever did.

D
Dan K

I use it on ditch banks and slopes 55 tilt down works perfectly.

T
Tom L

Heavy-duty frame no vibration, no bouncing.

M
Muhijra M

Blade replacements take just a few minutes.

R
Robert M

Cuts better than my previous $7,000 mower seriously impressed.

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