Winch from rear end

[FarmWrench]

OSHA would have a hay day with me.

Just like what I described. On the splitter I saw the cable went to a block and tackle that compressed a return spring and pulled a wedge into the wood. It was lightning quick! Single line master cylinder ran the break.

 

[CalG]

A look around , it appears that the rear ends out of some BMW autos offers a lot of gearing in a small envelope. This design also simplifys things with flanged input and outputs.

This option does complicate the brake side, detail, as there is no premounted brake carrier.

Another nice thing...they appear to go cheap on ebay or your local wrecker. ($100-$150)

 

[Roehm Farms]

The only problem with using the Brake/Differential action, it doubles the output speed when you brake one side. Your 4:1 diff just became a 2:1.

 

[plumbstraight]

The only problem with using the Brake/Differential action, it doubles the output speed when you brake one side. Your 4:1 diff just became a 2:1.

I have built a lot of winches for the 3pt system. Mostly pto units, but electric and hydraulic ones also.
Using a truck rearend is not the answer. It will way to fast to be usable and unless you shorten the axles as much as possible they will be to far to one side to winch effectively. Your winch needs to pull from centerline of your pulling unit.
I had some winches built with 9.1 gearing. With the 540 pto speed that was plenty fast. If it were me to do it again with just this and that to build with, I would use a bush hog gearbox, post hole digger box as a primary drive and run a sprocket to a drum with a ratchet brake on it. You can drop the ratios by the different sprockets and by putting a ratchet dog/pawl on the other side of the drum you can lock it. When released you should be able to pull the cable out with little effort. Everything would turn includint the driveshaft, but with that little bit of tension it will keep the drum from fouling. Just an idea. Was my next build if I wear out what I have now.

 

[plumbstraight]

A pic of what I have now, one with boom has an hudraulic unit , the little rig is electric

 

[dieselscout80]

I have built a lot of winches for the 3pt system. Mostly pto units, but electric and hydraulic ones also.
Using a truck rearend is not the answer. It will way to fast to be usable and unless you shorten the axles as much as possible they will be to far to one side to winch effectively. Your winch needs to pull from centerline of your pulling unit.
I had some winches built with 9.1 gearing. With the 540 pto speed that was plenty fast. If it were me to do it again with just this and that to build with, I would use a bush hog gearbox, post hole digger box as a primary drive and run a sprocket to a drum with a ratchet brake on it. You can drop the ratios by the different sprockets and by putting a ratchet dog/pawl on the other side of the drum you can lock it. When released you should be able to pull the cable out with little effort. Everything would turn includint the driveshaft, but with that little bit of tension it will keep the drum from fouling. Just an idea. Was my next build if I wear out what I have now.

If one used a truck 4 speed or 5 speed the lowest ratio in 1st gear with a 4.10 rear axle the would be about 10 to one.

 

[plumbstraight]

yes diesel, that works well as a trailer arch for moving wood. If the hand brake on the back of the tranny is still on it that is a plus. With the gearing in your tranny, the spiders welded solid in the rear end you will get as low a gearing as possible. I would bet it is even lower than ten to one. Love these contraption that get it done.

 

[muddstopper]

The only problem with using the Brake/Differential action, it doubles the output speed when you brake one side. Your 4:1 diff just became a 2:1.

no it doesnt.

 

[CalG]

On Perspective

A Farmi winch chain drive is set about 1:4 ratio.

Drum size means a lot !

 

[Roehm Farms]

no it doesnt.

Yes, in an open differential, with a constant input speed, if you stop one axle the spider gears start spinning and the other axle will be spinning at twice the speed it was before.

Just found a video that shows it, if you notice the free axle is turning faster then the carrier and ring gear.

http://youtu.be/xCqQPHZm8I4