Otto Gaiser Muli
Built: 1951 · Series: Muli
More machines from model year 1951
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Otto Gaiser Muli (1951): single-cylinder motorised trailer unit with an air-cooled diesel engine, a rated speed of 1,850 rpm and only one unit ever built
The Muli from Otto Gaiser was built in 1951 as a motorised trailer, a working machine that housed its drive unit in a trailer-like body rather than a classic tractor frame. According to available records, only a single unit of this vehicle was ever made.
Read on 3 more paragraphs
The air-cooled single-cylinder diesel engine displaces 763 cm³ and runs at a rated speed of 1,850 revolutions per minute. The rear wheels are driven through a simple gearbox with two forward gears and one reverse. At an empty weight of 690 kg, the Muli was among the lightest motorised tow units of its time.
The motorised-trailer layout was a design idea of the early post-war years, aimed at creating a simple tow unit for small holdings with minimal material use; it differs from the classic implement carrier, where attachments are mounted between the axles. The air-cooled single-cylinder engine needed no radiator or water pump, making it easy to maintain.
As a one-off, the Muli is not a vehicle that turns up on the used market; should a surviving example exist, it belongs in specialist hands and in a collection of historic farm machinery. With such a rare air-cooled single-cylinder engine, checking the cooling fins and the cylinder gasket before any start-up is essential. Original spare parts for a one-off prototype like this do not exist, so any repair inevitably means custom-made replacements.
Sources: SpecCodex-Register: Kennwerte des Modells Muli
Technical data
Engine
| Fuel | dieselcorrect |
|---|---|
| Power | 12 hpcorrect |
| Rated speed | 1,850 rpmcorrect |
| Cylinders | 1correct |
| Displacement | 763 cm³correct |
| Cooling | air-cooledcorrect |
Dimensions and weights
| Unladen weight | 690 kgcorrect |
|---|
Drivetrain and chassis
| Drive | rear-wheel drivecorrect |
|---|---|
| Gearbox | 2v/1rcorrect |
Origin and approval
| Construction | Anhänger mit Motorcorrect |
|---|---|
| Units built | 1correct |
Where this model stands
Power-to-weight ratio: 12.8 kW/t (9 kW / 0.7 t)
Power class: Compact (< 40 hp)
Stronger than 2% of the tractors in the register — out of 15,663 models with a stated power figure.
Calculated from the documented figures above — not a rating.
Frequently asked questions
How much power does the Otto Gaiser Muli have?
The Otto Gaiser Muli delivers 12 hp.
How much does the Otto Gaiser Muli weigh?
The unladen weight is 690 kg.
What engine does the Otto Gaiser Muli have?
1 cylinders, 763 cm³ displacement, Diesel.
When was the Otto Gaiser Muli built?
Production years: 1951.
What to check before buying
- Check the hour meter against the service records — a replaced instrument is the most common gap.
- Compare the data plate and chassis number with the papers.
- Check the weights in the papers against the figures here — attachments change them.
- Shift the gearbox cold and warm — jumps only show up at temperature.
- Load the hydraulics and watch for sag.
- Ask about parts availability for this build year — the running costs hang on it.
A general list for this type of machine — no substitute for an inspection or an appraiser.
We do not sell machines. We ask the dealers who carry this model and come back with price and lead time.
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This page carries 11 individual figures for this model. They come from 1 recorded source; every figure can be traced there. What we cannot document is not here — we leave gaps open rather than estimate them.
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Sources: [1]
Tractor in 3D section
Turn the model, look inside and click an assembly — each one is explained.