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How do PTO winches work?
Posted: Tue Apr 05, 2005 10:39 am
by slosh
I've got an old MQ Patrol for a farm hack and just like a tractor, a rear mounted PTO would be invaluable to power various implements.
But I don't know how these setups usually work on 4by's. Can you operate the PTO independantly of the gears or does the car have to send power to the wheels at the same time?
If I bought a setup that drove a winch at the front, could it be modded to send drive to rear PTO?
Thanks for any help.
Posted: Tue Apr 05, 2005 10:49 am
by rlaxton
All PTOs are slightly different but fall generally into a few broad types in the 4WD world. There are those that come off the crank, the lay shaft in the main gearbox, the transfer case and the rear driveshaft. The crank and layshaft versions are single speed while the others give you as many gears as you have in your main box. The Toyota and Landrover units usually come off the transfer case. GQ patrols come off the lay shaft.
I am pretty sure that the MQ comes off the transfer case. It may be reversable so that it can point backwards and forwards but that is usually only an option with layshaft units like the GQ. If you can't turn it around, you could run forwards to a bearing and use a chain to run the shaft backwards again. AFAIK, most tractor style PTOs are designed to run at 540rpm but you should be able to get that in first or second gear.
Another option would be to power an hydraulic pump from the PTO and then run hydraulic implements front, rear or anywhere really with quick connects.
Richard.
Posted: Tue Apr 05, 2005 10:53 am
by turps
Not sure on the tech bits.
But on a GQ the PTO out put is on the front of the gearbox. It is a 2 speed setup. Forwards and Reverse, these operate independantly of the normal gear box, to a certain extent anyway.
To engage the PTO, clutch must be depressed. Then engage either FWD or REV then take foot of clutch.
If I want I can drive as well. And my GQ I usually use 1st gear as the rest are to fast. This is done the same way you normally drive gears in a 5spd.
Have heard recently that the PTO on a GQ is good for approx 15hp.
On MQ/MK (not 100% on this but pretty sure this is right) the PTO is attached to the transfercase. I am not sure which part of the transfercase it is though. So not sure if it is before or after the hi/lo gears.
So its normal operation is similar to the GQ. Except you are able to choose different speeds to winch at. Also due to it being on the transfercase. It is possible to have an auto and still keep the PTO.
The GQ PTO is usually the factory one, I havent heard of an aftermarket one being made. But it is possible to have the shaft running to the rear of the car. This is how the guys have them for there hydro motor setups.
So I would guess the MQ/MK pto can be setup for rear out put also.
Posted: Tue Apr 05, 2005 2:54 pm
by Patroler
mq one comes off the back of the transfer case, it sits in place of the bearing carrier which supports the g/box output shaft, so it can be driven at all gearbox speeds, just stick the transfer in neautral and u can use it without the wheels turning,
mine could quit easily have a shaft installed to run a rear output, as the front facing output shaft hangs out of the back of the pto box (its chain driven and drops down towards the passenger side so the shaft can clear the engine and gearbox)
Posted: Wed Apr 06, 2005 10:16 am
by slosh
Thanks for replies fellas.
The one in the for sale sections is for MQ but seller (Tim D) mentions it comes with gear for gearbox output shaft- would this be t/case?
Posted: Thu Apr 07, 2005 6:45 am
by Patroler
na it'd have a dog, pretty sure i can see it, it sits behind the g/box output gear on the spline, then the nut goes inside, you'll have to remove your gear and get the back shoulder milled off about 8mm (from memory) to expose enough spline for the dog to sit on, just make sure the spigot bearing in the pto (the one that picks up the output shaft on the box) is in good nick if that shaft can move around too much you'll break a gear.
And be carefull when removing the cover from the back of your t/case as it has a roller bearing in it and the rollers can fall into the t/case - just slide it back gently and you'll be right