Running Toyota PTO Winch backwards

[Cutbak]

Call me stupid, but has anyone tried running a Toyota PTO backwards, to pull from the bottom of the drum? I can't remember if the gears are symmetrical in the winch and PTO etc. Some (all?) came with the 'wind / 'unwind' PTO box (4/5 gears each way) so the usage side of things is ok, just wondering whether it would handle the loads alright.

By the way, there IS a dangerously thoughtful reason for this tomfoolery.

[dazza85]

By the way, there IS a dangerously thoughtful reason for this tomfoolery.

And the reason is ??

[coxsy]

my nissan pto pulls from the bottom of the drum , most one's i've see cable feed out from under the drum,

[Steve_t647]

most winches pull from the bottom of the drum because it is strongest (least leaverage). they have a worm gear so should be good either direction the brake may be a problem tho as it only brakes incoming rope on the pto's which will become outgoing on your reversed one.

What is the application someone may have an alternate suggestion.

[Cutbak]

By the way, there IS a dangerously thoughtful reason for this tomfoolery.

And the reason is ??

... The reason is "a friend of mine... " has dicked around with the laws of physics and stuck his winch a 'bit higher than normal'. This increases torque loads etc. and the thought is that if it all turns to pigshit, it might be able to be run backwards, to pull onto the bottom of the spool to reduce the height of the pull above the chassis.

One advantage of feeding onto the top is that you can see the rope going on easier etc. -- although having seen Fluffee's or Tony White's winch speed, maybe it's not that important.

The brake thing isn't a prob because it relies on the gear ratio of the worm drive, that obviously stays the same either way. And it holds well...

[De-Ranged]

before you do this pull the worm gear and check the teeth

[]_[]_[]_[]_ sqaure teeth on both sides is all good

But if they look like this

/]_/]_/]_/] or [\_[\_[\_[\_

Then by reversing them you are now driving off the sloped part of the thread which will cause the worm to try and push away under load (same as running a diff in reverse) making it weaker not super bad just realise it won't be as strong if thats the case

Cheers Reece

[sig]

if you want the best of both worlds look for a twin gear pto drive then u can run the cable off the bottom

[Ben]

Another thing to consider is the direction of the force generated in the worm gear. Spinning it one way will try to drive the worm out the front of the housing. Spinning it the other will try to drive it out the rear.

I've got no idea which end is stronger, but I suspect the rear (the end the shaft comes in) would be the weaker of the two given thats the end that has the adjuster for bearing preload etc.

Worth considering as they have been known to spit the worm straight out through the casing. I think it way Rodger McKays winch I watched do that...

Ben

[MNC]

Another thing to consider is the direction of the force generated in the worm gear. Spinning it one way will try to drive the worm out the front of the housing. Spinning it the other will try to drive it out the rear...

Did that on my Safari once. Was amazed to see the wormgear smashed straight through the housing - a nasty and expensive mistake. One funny thing was for a laught I rang Nissan to ask price for a new replacement - it was $9,000

[Cutbak]

Glutten for punishment that I am, I might just have to pursue this whether or not pulling onto the top works out. There are some things that just need to be known.

I have considered the "winding the worm gear out the end" thing, because I too have heard it happening to Nissan winches...

Actually, I checked a Nissan winch the other day. Interestingly, I'm bloody certain the input shaft runs the same direction as the Toyota's, but spins the drum the other way. Now if I'd had a spare Nissan winch, when I started all this dickin' around, I probably would have used that on the end of the Toyota drive and been sorted by now.

Far, far too easy though.

Hey Sig, by "twin gear pto, do you mean the ones that give you 4/5gears in and out? The ones with "wind/unwind " on the gear knob? Coz that's what I've got. Do you know if they're equally strong in either direction? I would have thought so, but can't remember what the gear sizes looked like. Cheers mate.

[GQTROL]

Input shaft on Nissan PTO winch runs in clock-wise direction when winching in. Rope spools on from the bottom of the drum.

Toyota PTO's will also push the worm gear out the bottom of the housing.