Gearbox suggestions ?

jCarroll · Nov 14, 2015

I need a right angle gearbox, with about a 2:1 speed up ratio, and no more than 20 hp through it.
What speed ratios does a typical PTO grain auger gearbox have?

Any other applications where I might scab such a gearbox?

Thx for your thoughts.

RM-MN · Nov 14, 2015

Both my PTO grain augers have a 1 to 1 gearbox.

DGinVT · Nov 14, 2015

Try the "Surplus Center" in Nebraska, That is where I got mine from. They come in various HP sizes.

JMS/.MN · Nov 14, 2015

Grain augers usually 1:1. NI 456 round baler is about 2:1. Also check stalk choppers, especially old, two row units.

Graham of New Zealand · Nov 15, 2015

The gearbox off a New Holland model 36 double chop forage harvester (6ft cut) goes from 540 (PTO) to 1000 RPM (blower)and takes lots more HP than you are needing, and are small in size

sd pete · Nov 15, 2015

JMS has it with the New Idea baler.

tomstractorsandtoys · Nov 15, 2015

Many Deere implements from the 60's used a gearbox that was 540 in and 1000 out so that if you wanted to change speeds you flipped them over. The 22 and 32 hay conditioners and the 480,483 and 485 mower conditiones come to mine. Tom

Andy Martin · Nov 15, 2015

If they are like Vermeer balers, where you reverse the gearbox to go from 540 to 1000 it's not a 2:1 gearbox, more like 1:1.36, speeds 540 up to 735 and slows 1,000 to 735 so the baler does not know what the PTO speed is, it just turns at 735 rpm.

big jt · Nov 16, 2015

LOL there are a couple of implements that the optimum speed to operate is 600 RPM. Grain augers is one of them. Faster just makes you feel like you are doing more, nothing gained except beating up some grain.

Gonna let you guys guess as to what the other implement is but it is the reason that PTOs were set up as 540 to begin with till the horsepower exceeded what a 1 3/8" shaft could handle at 540.

jt

big jt · Nov 16, 2015

Oh yeah forgot to mention. Don't think you are gonna find a grain auger that has anything other that 1:1 ratio gear box. Someone else suggested Burdens Surplus Center in Lincoln NE and I will do that also.
Surplus Center

Determined · Nov 16, 2015

Share with us what your project is and we can better narrow down options for you.
Others have mentioned most auger boxes are 1:1
You still have options, for example with a 3 inch pulley or gear on the gearbox being driven by a 6 inch pulley or gear on the motor you can still obtain your desired speed and change of direction.

jCarroll · Nov 16, 2015

I have a buzz saw with flat belt pulley on the saw arbor.
Want to use 540 PTO to drive it with arbor speed about 8-900 rpm.
Current idea is to go into a right angle gearbox with the PTO,
Flat belt pulley on gearbox output driving arbor pulley.
Flat belt will serve as "shear pin".

Saw would not be mounted on tractor. On wheels pulled to buzzing site,
Then tractor PTO hooked up.

Yes, I have a good chainsaw.
Comments are welcome.

ss55 · Nov 16, 2015

Determined seems to have a good solution. Another alternative is to drive the saw with just the flat belt and 2:1 pulleys, no gearbox. Layout the belt horizontally to move the tractor far enough behind the blade that the tractor does not interfere with handling the wood.

What diameter is your saw blade, does it have a maximum rpm marked on it?

jCarroll · Nov 16, 2015

No belt pulley on tractor.

32" diameter saw blade.

Andy Martin · Nov 16, 2015

So can you use a 1:1 gearbox with a pulley on the gearbox output twice the diameter of the pulley on the saw?

Gearbox suggestions ?

jCarroll

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RM-MN

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DGinVT

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JMS/.MN

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Graham of New Zealand

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sd pete

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tomstractorsandtoys

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Andy Martin

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big jt

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big jt

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Determined

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jCarroll

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ss55

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jCarroll

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Andy Martin

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