How Much Tractor Do You Need to Run a Mini Baler?
Horsepower, PTO speed, linkage category and ballast — how to work out whether the tractor in your shed will run a mini round baler, mower and rake.
It is the question we get more than any other: will my tractor run one of these?
Usually the answer is yes, and usually the number people worry about — horsepower — is not the one that decides it. Here is how to check properly, in the order that matters.
1. PTO speed comes first
Our hay gear runs on a 540 rpm PTO with a T4 standard six-spline driveshaft. That is the common standard for compact and utility tractors in Australia.
If your tractor only offers 1000 rpm, you cannot simply run the implement faster or slower and hope — the chamber and pickup are geared for 540. Check the PTO plate or the operator's manual before anything else. Many tractors offer both; you just need to select the right range.
2. Then the linkage category
- CAT 1 three-point linkage suits most compact tractors under about 45 hp.
- CAT 2 is heavier, wider-spaced, and found on larger utility tractors.
Our Drum Mower — 1.65 m is a CAT 2 implement at 440 kg, so it needs a tractor with CAT 2 linkage and the weight to carry it. That is the single most common mismatch we see — someone with a 25 hp compact wanting the 6 ft drum mower.
3. Now the horsepower
Rated power for our main hay implements:
| Implement | Tractor power | PTO |
|---|---|---|
| Mini Round Baler 60 × 70 cm | 20–65 hp | 540 rpm |
| 2-in-1 Rotary Rake-Tedder 2.5 m | 20–65 hp | 540 rpm |
| Drum Mower 1.65 m | 40 hp+ (CAT 2) | 540 rpm |
Two notes on reading those numbers.
The number is PTO horsepower, not engine horsepower. A tractor advertised at 25 engine hp might deliver around 20 at the PTO once transmission losses are counted. If you are right on the line, work off the PTO figure.
The upper limit matters too. A 90 hp tractor will not make a mini baler work harder; it will just make it easier to overload the pickup. The range exists because the driveline is sized for it.
4. Weight and ballast
Horsepower pulls; weight keeps you on the ground. A 448 kg baler or a 440 kg drum mower hung off the back of a light compact tractor lifts the front end, especially on a slope.
Rules of thumb:
- The implement should not weigh more than roughly half the tractor's own weight for comfortable handling on undulating ground.
- Fit front weights or a loader if the front end feels light with the implement raised.
- Keep the implement low when travelling across a slope.
Our baler is a trailed unit with its own 16 × 6.5 in tyres, which takes most of that weight off the linkage — one of the reasons it suits smaller tractors than the mower does.
5. Hydraulics and electrics
Check you have:
- At least one rear remote if the implement uses hydraulics. Our baler has fully integrated hydraulics for bale ejection.
- A 12V supply at the back for the baler's electrical lead. A simple battery lead does the job.
6. Ground speed and gearing
Working speed for both the baler and the rake-tedder is around 5 km/h, depending on pasture and tractor. You need a gear that holds that speed with the PTO at 540 rpm without labouring. On most compact tractors that is low range, second or third.
If your only gear near 5 km/h has the engine barely above idle, the PTO will not be at rated speed and the baler will feed poorly.
Worked examples
A 25 hp compact tractor, CAT 1, 540 rpm PTO. Runs the mini round baler and the rake-tedder comfortably. Too light and too small in the linkage for the 1.65 m drum mower — pair it with a smaller cutting solution instead.
A 45 hp utility tractor, CAT 2, 540 rpm, one rear remote. Runs the entire hay line: mower, rake-tedder, baler. This is the sweet spot for a small property, and it is the setup the Hay Maker Package is built around.
A 70 hp tractor. Everything runs, with power to spare. Just resist the temptation to push ground speed — the baler chamber sets the pace, not the engine.
Quick checklist before you buy
- PTO speed is 540 rpm. ✔
- Linkage category matches the implement. ✔
- PTO horsepower sits inside the rated range. ✔
- Tractor weight is comfortably above half the implement weight. ✔
- A rear remote and a 12V lead are available. ✔
- There is a working gear around 5 km/h at rated PTO speed. ✔
If you can tick those six, you are set.
Related reading: Mini round baler buyer's guide · How to make hay on a small property
Still unsure? Send us your tractor's make, model and PTO details and we will tell you straight whether it will run the gear.