Construction of a diesel mini hauler

Sqerty 23 Dec 2025 13:04 41 4038 Cool? (+30)

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TL;DR

A homemade mini hauler uses a 3 hp internal combustion engine from a NAC scythe.
A 60:1 worm gearbox drives a mower-tractor differential, with 18-8.00x8 wheels mounted on it.
The powertrain combines the 3 hp engine and 60:1 reduction to move the hauler.
The kipper is manual, and steering changes by turning the front axle 180 degrees.

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Good morning.
I would like to show you my mini hauler, which is powered by an engine from a petrol scythe.

The 3hp internal combustion engine comes from a NAC scythe and is connected to a 60:1 worm gearbox.
The gearbox drives the differential from the mower tractor, on which the 18-8.00x8 wheels are mounted.

The kipper is manual and the change of direction is achieved by turning the front axle 180 degrees.
The entire construction stage and a demonstration video of the principle of operation.

About Author

Sqerty wrote 436 posts with rating 592 , helped 5 times. Live in city Ostrowy nad Okszą. Been with us since 2009 year.

Comments

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LEDówki 23 Dec 2025 13:36

The engine is from a lawnmower. The scythe was used by scythers. Silly names from other languages are not necessary for us. A diesel-powered trolley is fine. Turning the front axle is not too cumbersome?... [Read more]

m2606 23 Dec 2025 13:43

Has the Yato tool trolley lost its wheels yet? :-) Will you take a photo with the axle reversed? [Read more]

CMS 23 Dec 2025 17:09

The design is cool and practical. However, I have a question from a different angle. What model of shoes do you have? [Read more]

kombo 23 Dec 2025 20:27

The name "self-propelled storage tray" fits. :) [Read more]

kjoxa 24 Dec 2025 00:49

Cool, although with that kind of talent and capability I'd give an electric drive. Although... here the advantage is that you don't have to worry about keeping an eye on the power supply though, maybe... [Read more]

zgierzman 24 Dec 2025 08:43

Scythes were used by reapers - to cut grain at harvest time, or grass during haying. Kosynierzy is the story of how scythes were re-positioned 'for the stiff' for lack of a better weapon to fight with. There... [Read more]

LEDówki 24 Dec 2025 08:51

No, the rules of vocabulary are clear the ending ark you add to the stem if you are forming the name of a machine. You have milling machine, drill, dryer, sharpener, loader, trimmer. The rest of the oddities... [Read more]

zgierzman 24 Dec 2025 09:08

You've probably never seen a real scythe - it can't be done as you say. https://obrazki.elektroda.pl/3300049100_1766563649_bigthumb.jpg Per Wikipedia : Typical treatments resulting in the... [Read more]

LEDówki 24 Dec 2025 09:14

Do you take me for a dimwit? I didn't see a scythe put on a stiletto. No one chased the neighbours in the village, the boneheads died out long ago. I have seen a scythe, my grandfather showed me how to... [Read more]

kkknc 24 Dec 2025 09:23

Oh lord, it smokes like a two-stroke. And when changing direction I can see the exhaust going straight into my face. [Read more]

krzbor 24 Dec 2025 11:08

I always thought a battery-powered mower was a no-go - after all, smaller petrol mowers stuck in taller grass. However, I have found that the power of the higher voltage electric mowers (36 volts) can... [Read more]

LEDówki 24 Dec 2025 11:12

If the author is a good mechanic, he doesn't have to be a good electronics or electrician. He could make a very nice trolley powered by an internal combustion engine and OK. As for propulsion - power is... [Read more]

acctr 24 Dec 2025 11:15

What capacity does it have? What if there is a need to push the trolley by hand? The worm gear does not get in the way? [Read more]

E8600 25 Dec 2025 01:55

Then there is the gear ratio on the chain at an eye-watering 4:1 i.e. a total of about 240:1, and with this ratio a small electric motor would work well (the main problem is 2T motor noise and exhaust).... [Read more]

m2606 25 Dec 2025 10:27

For continuous use, an electric motor is not justifiable from a practical point of view. For occasional use even more so. [Read more]

Staszek_Staszek 25 Dec 2025 11:26

I use DC motors and they meet my requirements. The ones I have are quiet, which is critically important to me. [Read more]

m2606 25 Dec 2025 14:29

This is not a priority for everyone. I use electric ones too, but they are not better for everything. [Read more]

E8600 25 Dec 2025 18:09

Let's not kid ourselves, YT-built equipment is mainly about views, while performance is secondary. An electric drive would be boring and less spectacular (clickable) than an internal combustion engine.... [Read more]

m2606 25 Dec 2025 18:15

The peasant built himself a cart out of rubbish. I don't understand what the whining is about. [Read more]

FAQ

TL;DR: DIY mini hauler uses a 3 hp engine and 60:1 worm gearbox; “The 3hp internal combustion engine…is connected to a 60:1 worm gearbox.” [Elektroda, Sqerty, post #21788361]

Why it matters: Builders searching “how to build a small powered hauler” get specs, trade-offs, and fix-it tips distilled from the thread. This FAQ is for hobby fabricators comparing combustion vs. electric drives and looking to avoid common pitfalls.

Quick Facts

Powertrain: 3 hp NAC petrol engine → 60:1 worm gearbox → mower-tractor differential → 18×8.00-8 wheels. [Elektroda, Sqerty, post #21788361]
Direction change: rotate the front axle 180°; dump bed is manual. [Elektroda, Sqerty, post #21788361]
Secondary reduction: approx. 4:1 chain stage; total reduction ≈ 240:1. [Elektroda, E8600, post #21789556]
Noted issues to address: exhaust in operator’s face when reversing; loud 2T noise. [Elektroda, kkknc, post #21789035]
Bearing caution: avoid relying on a single seger with taper rollers; add proper retention. [Elektroda, E8600, post #21789556]

What exactly powers this mini hauler and how is torque multiplied?

It’s driven by a 3 hp petrol engine from a NAC brushcutter, feeding a 60:1 worm gearbox, then a mower-tractor differential. This setup provides high torque at low speed for hauling. Wheels are 18×8.00-8, which suits low-speed traction on uneven ground. [Elektroda, Sqerty, post #21788361]

How do you change driving direction on this build?

There is no reversing gearbox. The operator rotates the entire front axle by 180 degrees, and the hauler drives the other way. This keeps the drivetrain simple and robust for a garage build without complex linkages. [Elektroda, Sqerty, post #21788361]

Is there a reversing walk-through?

Yes—three steps:

Stop the engine and stabilize the hauler.
Unlock and rotate the front axle 180°.
Restart and proceed in the new direction. This is shown in the linked demo video by the author. [Elektroda, Sqerty, post #21788361]

What’s the total gear reduction and why does it matter?

A user identified a secondary chain reduction around 4:1. Combined with the 60:1 worm stage, total reduction is roughly 240:1. This large ratio trades speed for strong tractive effort, ideal for starts on soft ground and heavy loads. [Elektroda, E8600, post #21789556]

Can you push the hauler by hand if the engine stops?

Manual pushing can be difficult because worm gears resist back-driving. A commenter flagged this as a practical failure case when the engine is off or stalled. Plan for a clutch, freewheel, or tow-point if manual movement is required. [Elektroda, acctr, post #21789141]

How loud is the drivetrain and how to reduce noise?

Commenters noted two-stroke exhaust noise and smoke. A practical fix is upgrading to a better muffler for sound attenuation and directing gases away from the operator. “I would change the muffler for more soundproofing.” [Elektroda, E8600, post #21789556]

Does the exhaust blow toward the operator when reversing?

Yes, one user observed that reversing directs exhaust toward the operator’s face. Consider rerouting the muffler outlet or adding a deflector to protect the operator during reverse movements. [Elektroda, kkknc, post #21789035]

What is a worm gearbox and why use it here?

A worm gearbox uses a screw-like worm driving a gear for large single-stage reduction and inherent back-drive resistance. It simplifies the layout and delivers high torque for a compact hauler, at the cost of manual back-drive. [Elektroda, Sqerty, post #21788361]

What is the load-box capacity and frame load rating?

The author did not state volume or payload. Users asked about load-box capacity and frame load rating, implying interest in quantified specs. You’ll need measurements and material data to calculate safe limits. [Elektroda, LEDówki, post #21788386]

Is electric drive better than the petrol setup here?

Opinions were split. Some favored electric for quiet operation and easy reversing; others preferred petrol for sustained power without battery concerns. Battery performance in winter and waterproofing electronics were raised as drawbacks. [Elektroda, 21789126/21789666/21790693/21792981]

How does battery performance change in cold weather?

A participant cautioned that batteries don’t perform the same in winter, highlighting reduced effectiveness compared with warm conditions. This impacts runtime and peak power for electric conversions. [Elektroda, partyzancik, post #21792981]

Are there waterproofing concerns for an electric conversion?

Yes. A user warned that controllers, BMS, and chargers can fail from water, vibration, and contamination. Improper storage may also deep-discharge lithium cells via leakage. Protect and seal electronics if you go electric. [Elektroda, satanistik, post #21790693]

Any bearing or retention issues to fix on this build?

One commenter flagged taper roller bearings seemingly secured only by a seger. The recommendation was to improve retention and protection to handle axial loads and shocks. [Elektroda, E8600, post #21789556]

Does the builder have a full workshop like in the video?

A user asked about the workshop seen in the video, but the author did not respond with details. The visible fabrication quality suggests solid tooling and welding capability. [Elektroda, LEDówki, post #21788386]

What is the tire size 18×8.00-8 and why choose it?

It indicates an 18-inch diameter, 8-inch width, for an 8-inch rim. This footprint suits low-speed traction and load distribution on grass, dirt, and yard surfaces. [Elektroda, Sqerty, post #21788361]

Is the finish overkill for a work tool?

One user praised the careful, exhibition-like finish while acknowledging it’s a working dumper. Good finishing improves durability and user pride without reducing utility. [Elektroda, Erbit, post #21794816]

Generated by the language model.