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MechMaxx 429cc KOHLER E-Start Stump Grinder with Tow Bar

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Original Price $2,899.00
Current Price $2,599.00

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Description

Remove tough stumps fast with the SG380 15" stump grinder featuring a 14HP 429cc KOHLER electric‑start engine, 12 replaceable carbide teeth, and a centrifugal clutch with dual drive belts for smooth, reliable power transfer. Built for landowners, landscapers, and property managers, it delivers strong cutting performance, easy belt adjustment, and tow‑bar mobility for efficient stump removal across any property

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

MechMaxx 429cc KOHLER E‑Start Stump Grinder with Tow Bar

Remove stumps efficiently with this KOHLER‑powered stump grinder designed for residential and small‑property maintenance. The 429cc electric‑start engine drives a carbide‑tooth cutting wheel that supports controlled grinding across the stump surface. A reinforced frame helps maintain stability during operation, while the tow‑bar design allows the grinder to be transported easily between work areas.

The compact structure makes it suitable for locations where larger equipment cannot maneuver. Its layout supports predictable handling for property owners and contractors needing a standalone stump‑reduction tool.

Product manual (PDF)

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Engine manual (PDF)

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Cutter Wheel and Teeth
Cutter Wheel and Teeth

Mounted on the 10-inch diameter cutter wheel are 12 sets of professional-grade teeth, enabling a cutting diameter of an impressive 14 inches . This allows for cutting stumps at a higher elevation from the ground. The pocket is forged from 42CrMo, and teeth are made of YG11C alloy, with a diameter of 1 inch. This design ensures more efficient stump cutting, improving work efficiency by approximately 35% compared to other types of teeth.

KOHLER® Command PRO®
KOHLER® Command PRO®

This is what it takes to be a PRO. Performance-driven features like a heavy-duty air cleaner, forged-steel crankshaft, electronic ignition and cast-iron cylinder liner. KOHLER® Command PRO® is the standard for professional-grade power and performance.

• Quad-Clean™ all-season four-stage cyclonic air filter - effective engine protection for tough-and-dirty conditions

• Large-capacity fuel tank means more time working, less time filling

• Power or repower your equipment without expensive modifications

• 3-year commercial limited warranty

Electric Start and Battery: Kohler
Electric Start and Battery: Kohler

The ignition key has been moved to the control panel, accompanied by a safety pressure lever. Pressing down on the safety pressure lever will start the engine. A 12V20Ah lead-acid battery is installed at the bottom of the handle, shifting the center of gravity towards the rear of the entire machine. This configuration helps conserve energy while the machine is in operation.

Chassis Rotation
Chassis Rotation

The design concept is to integrate the engine, cutter wheel, and handle into a single welded structure as a working unit. There is a set of rotating mechanisms between the working unit and the chassis. The lever on the right side of the handle can lock and release the chassis. When in a ready-to-work state, lifting the left brake handle can simultaneously lock both left and right tires. After releasing the chassis, the unit can swing left and right to perform cutting tasks. This design allows operators to work more easily and continuously.

Left and Right Swing Rotation Angle
Left and Right Swing Rotation Angle

The chassis's left and right swing angle can reach 65 degrees, with a linear distance of up to 31.5 inches. This allows for easy cutting of stumps with a diameter of up to 31.5 inches, relying solely on the simple swinging of the chassis.

Tyre Fixation
Tyre Fixation

In our latest design, both tyres are fixed simultaneously, and the chassis swings left and right to perform tasks. The major advantage of this design is the ability to work more easily and continuously. Fixing both tyres at the same time ensures protection against collision injuries caused by operator errors, greatly improving operational safety.

Cutting Height and Depth
Cutting Height and Depth

With a maximum cutter wheel rotation diameter of 14 inches and a dual-wheel locking design, the handle can easily be pressed down, achieving a cutting height of 15 inches above the ground and a depth of 10 inches.

Adjustable Rotation Handle
Adjustable Rotation Handle

This lever controls the locking and releasing of the chassis. When the chassis needs to rotate during work, lift the lever. To move the machine to the next work area, return the lever to its original position, and simultaneously release the tire brake handle to enable movement.

Tow Bar and Support Leg
Tow Bar and Support Leg

A 2-inch coupler is mounted on the tow bar, compatible with a 2 inch trailer ball. When outdoor work is needed, you can use the ATV or pickup truck to tow the stump grinder to work area. The trailer hitch comes as a standard feature which can be installed when needed. You can lower the support legs to prevent the cutting head from hitting the ground when not in operation.

  • Demonstration
  • Assembly & Installation
Product Warranty

MechMaxx 429cc KOHLER E-Start Stump Grinder with Tow Bar (SKU: 130400) 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.

Engine KOHLER CH440 Cutting Height 15 in Above Ground
Certification(S) EPA Phase III, CARB Phase III Cutting Depth 10 in Below Ground
Engine Type Single Cylinder, 4 Stroke, Air-Cooled, OHV Rotary Chassis Yes
Displacement/ HP 429 cc; 14 HP Max. Rotation Angle 65 Degrees
Start E-Start Max. Rotating Distance 31.5 in
Battery 12 V 20 Ah Lead-Acid Tow Bar Included
Brake 2 x Wheel Lock Coupler 2 in Ball
Belt 2 x V-Belts Wheelbase 32 in
Belts Material Kevlar Max. Speed Off-Road Only and Max. Speed 15mph
Clutch Centrifugal Clutch Front Wheel 10 in
Cutting Wheel Dia. 14 in Tire 145 / 70-6 Tubeless Tyre
Cutting Wheel Thickness 0.47 in Assembled Weight 303 lbs
Carbide Tip Qty. 12 Pcs Gross Weight 353 lbs
Tip Holder Material 42CrMo Packing Size  45 x 30 x 29.5 in
Carbid Tip Material YG11C Alloy

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: 26 (100%)
  • 4 stars: 0 (0%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
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Rodney M

I have used the stump grinder on 7 stumps so far and it is working great. Love the way it swings from side to side. It’s a little heavy if you have to push it in the grass but the tow bar works well and you can usually position it where you want it with the tow bar. Had some trouble with it today and it seemed that the gas cap wasn’t venting and it was starving for gas. I would loosen the cap then it would be ok again. I’ll have to check on that next time I use it.

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Todd M

I've been very pleased with the SG380 stump grinder. I've removed 9 large stumps so far and, while it took a couple stumps to get used to the best removal method, I've gotten considerably more efficient with the process. For my needs, I find it to be a great balance of value for the price and capability in grinding away nuisance stumps. The grinder is well made, easy to maintain, and thoughtfully designed. I have zero regrets in making this purchase to manage existing and future stump removal on my property.

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Kailee K

What a great piece of equipment to have. I have ponderosas and jackpines, and this thing is fun to use. It takes slightly longer on the fresh cut stumps because the tree is wet and the fibers hold together more, but it cut through really fast on the tree stumps that where cut last year. I ordered the big wood chipper so I can process the whole tree from top to bottom, anything thicker than 4-5'' we use for fire wood anyway.

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David W

Great machine. I bought the Kohler engine with key start. I recommend both options as they make it fun to run. I live on a mountain and am using it on trails, nothing level, have 60 stumps to tackle. I'm retired, in my 60's, and on level ground I could run it all day. On a hill, I'm done in 2 hours. It Takes about 10-15 min for a 12" hardwood stump cut to 4" below ground. 30-45 minutes for a 24" stump. I hit a lot of rocks but the teeth are still going strong after 7 medium to large stumps (12"-24"). Assembly was not as straight forward for my mechanical aptitude but with You Tube I put the machine together in 3 hours and about an hour to tweak a few of the cable pulls by my self. I read a lot about this machine and one good piece of advice is don't dig so aggressive it stalls or slips the belts. This will wear out the clutch and belts. It took only one stump to understand how to carve a stump with minimum wear. I bought an extra pack of teeth and belts, I tend to run equipment a little hard. I think this beast will live a long time!!

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Ronnie E

Great grinder. Will definitely get the job done. Koehler engine is awesome. So I'll just say buy this one you won't be disappointed.

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Vince R

I have a lot of stumps, so I determined this would be a good investment versus hiring someone to do the stump grinding. It was a good choice. It was packaged very well and assembly was easy.

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Edwin L

Decent machine for the price. The teeth that came with the machine help up longer than I expected

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jamin b

From packaging to assembly, I was impressed with the whole process. It is very well built and works flawlessly. Nice Kohler engine.

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Donald S

Simply grind 2 white oak stakes with an average diameter of 10 inches and approximately 4 inches into the ground in 1 hour. Ultimately, the product works as advertised. I am very satisfied and will be putting the SG380 stump grinder to the test now that I have unlimited stumps.

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Ronald N

I have sharpened it about 30 times and am very happy with it! Poplar and other softer wood stumps will take 10-30 minutes, depending on size.

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Eric O

After grinding an estimated 100 stumps I would highly recommend your product to anyone looking for this type of machine. Super strong, simple and efficient.

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Michelle J

After 25-30 oak and pine stumps it worked great! The 14-horsepower KOHLER engine has plenty of power! I really like it so far.

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Amy B

The machine does its job and is very easy to use. It took about 30 minutes to grind two large stumps down to below soil level, enough to satisfy me. I will purchase MechMaxx products again in the future.

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David H

I love it, it's in perfect condition and I've completed seven stumps so far. It's very sturdy. I would chop the stump closer to the ground, the sharp teeth are great.

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Jackson M

I work on my own farm and it fits the stumps perfectly and I think is more convenient than using a large excavator. Helps me clean up around my property.

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Dan S

I work on my own farm and it fits the stumps perfectly and I think is more convenient than using a large excavator. Helps me clean up around my property.

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Tommy S

A great tool, this stump grinder works great and will definitely make life easier.

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Christina B

A great tool, this stump grinder works great and will definitely make life easier.

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Denise M

Very good, the blades are very sharp, better than the larger ones I rented. I have made about a dozen tree stumps, all of hardwood. There's definitely a learning curve with the different sized stumps, but the more you use them, the better you'll get.

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Kimberly A

This is the best stump grinder for me. Residues from deforestation can also be crushed and used for other purposes, such as soil fertilization.

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Kelly H

The machine is clean and has good parts. Nice kohler engine. Easy to move when doing small stump work. It looks like green teeth on a giant rotor. This stump grinder is ideal for gardeners who need to remove tree stumps from their garden beds.

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Christopher H

This machine is the perfect size for a few of my small tree stumps. Been looking at the tight stump grind and it's been fun.

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Jocelyn G

First time using it, grinding 8 small tree stumps, it did a great job and I will continue to use it.

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Christopher E

I bought this precision grinder after my land was cleared. It has ground down about 120 stumps, from 2 to 8 inches, and is still on its original teeth. Definitely a great piece of equipment.

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Kristin S

I have grounded about 75-100 tree stumps without any problems elsewhere as well as in my own home. It does a great job.

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Christina P

This stump grinder does a great job. Love watching the stump grinder in action. Especially for the first time.

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