Forum:
I've just read one of the great How It Works articles wrtten by assassin and discovered that some Daihatsu's had a PTO drive coming off the transfer box, as a farming lad this gets me very excited 
(although obviously compared to tractor PTO it'll have its limitations)
Does anyone know whether all models had the option of taking a PTO drive off the transfer box or was it just earlier models?
Would a proper fourtrak hydraulic pump need to be sourced and how rare are these? Are there any output figures available for these pumps?
Any help would be much appreciated.
Thanks,
Rob
The factory PTOs are
The factory PTOs are mechanical, not hydraulic drive. There is a funny shaped 6 bolt alloy plate at the rear of the transfer case. Inside is a 24mm (I think) nut that holds a spacer in place. Fitting the PTO drive means removing the plate, and the spacer. The spacer is replaced by a gear, the PTO unit bolts on in place of the plate. The PTO unit hangs down to the rear of the transfer case. A shaft with 2 unis them goes forward, through the hole in the front cross member. It is supported by a bracket that bolts to the 2 10mm holes in the bottom of the gearbox bellhousing. The winch then bolts in a cradle between the 2 chassis rails, in front of the front cross member. A silly chrome front bumper bar then goes in front of this. The factory cradle also has roller fairleads, and a nudge bar on it.
The winch freewheels via a dog clutch and lever on the drivers side of the winch. The lever locks in engauged position via a pull button on the front of the winch.
The PTO winches work brilliantly, with a heap of cable, about 45 metres spooled on the drum. I have used mine to drag out 100 series cruisers bogged to the floor pan, something which an electric winch could not do. My Rocky, with its winch and diff locks has now been sold.
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Thanks
Two very useful replies there, thanks for taking the time to write them
I hadn't previously considered having a PTO winch (I was looking at getting an electric one) but based on your recommendation I'll give them a look.
As much as anything it was out of curiosity that I wrote the original post as I just saw 'PTO' and my mind started getting carried away thinking of potential contraptions!
Please bear with me if I'm a bit slow on the uptake and to make things worse I haven't got a Fourtrak to look at as I haven't found one yet.
If the hydraulic pump had an adapter plate made should most hydraulic pumps of a proportional size fit(e.g. like those fitted to vehicles with cherry pickers/tipper bodies) That's assuming the mating face on the pump was a similar size to that on the mating face on the transfer box once the blanking plate is removed. Or have I misunderstood this and is the blanking plate removed a part of the transfer box housing itself in which case that is a definitely a lot of fabricating!
Also are the drive gears on the pumps standard sizes and are there gears available the right size to mesh with them that will fit onto the shaft on the transfer box?
Can't remember if that's everything but if you could read that and understand what on earth I was on about then well done!
Thanks again,
Rob
Most hydraulic pumps come
Most hydraulic pumps come with a variety of flows and maximum pressures, and usually a maximum input speed, this is why the adaptor plate was fitted. Due to the number of after market hydraulic winches, their pressure and flow requirements, and differing sizes of pumps available, a standard mounting plate was developed. This allowed the individual pump to have a mounting plate fitted to it and mate to the universal mounting flange. Many pumps have a straight keyed input shaft, others tapered, while some have splines, so a wide variation of pump input shafts. Daihatsu has a main input shaft which goes through the gearbox and into the transfer case, this is a plain keyed shaft at its end to allow a number of fitments.
Such a shaft design allows a number of options as local transfer adapters could be mixed and matched, or machined locally to fit the selected pump. This gave flexibility and simplicity to what is a world market vehicle, it allows for many permetations; basically if a standard shaft is not available one can be made quickly and easily.
Considering the numerous pumps available on the world market, it would be impossible to make an adaptor housing to fit them all, as well as a standard drive input system.
Thanks for the reply. I can't
Thanks for the reply. I can't really go any further with it until I get my Fourtrak but now I have an idea of what might be possible.
Thanks for making the effort to explain it.
Rob
I've never seen a 'trak with
I've never seen a 'trak with the PTO winch. Its a shame we didn't get more over here....
We did get them over here,
We did get them over here, they were an option which were shaft driven from the PTO on the rear of the transfer case. The universal mounting plate was not available in European models, but some were imported by individuals and fitted to power a multitude of accessories.
Most winches were used by the utility companies as they were more controllable than electric winches, and they were often used for cable pulling in trenches or conduits.
I know we had the option
I know we had the option here, but I ment that not alot of people choose it/the ones that had it were companies and therefore joe bloggs didn't get his hands on them.
There are still some
There are still some appearing occasionally, and if you have the drawings you could make one up from scratch. I have made one many years ago, but alas i no longer have the drawings i made them from.
pto
yes i own one in good working order if anyone wants to buy one.
The original PTO's were
The original PTO's were actually shaft driven as Bundyrumandcoke suggests, but there was also a universal mounting plate available.
This plate was part of the housing which has to be replaced to which a number of attachments could be mounted. For a hydraulic pump it meant making an adaptor for the plate to mount the pump to it, some where available in certain markets by Daihatsu, but not for the European market.
This meant many pumps could be fitted to suit a range of applications to balance the pumps pressure and flow requirements. In addition the shaft was keyed to allow a sliding drive to be fitted instead of a clutch operation, thus giving an option.
I have not seen one of the universal adaptor plates for a few years, but have made my own castings or fabrications to house specific pumps.
These are preferable to the power steering pumps, if a lot more work; and allow the full engine power to be used to provide the full pressure and flow. Power sreering pumps provide the pressure, but not the flow to power many hydraulic aftermarket winches available.
If you want to power a pump from the transfer case it will be very much luck to source a universal mounting plate on an original casting, or a lot of fabrication.
May be interested
If somewhere is found to supply/make a bracket/and suitable hydraulic pump, I may be interested in 1 to start off with and possibly more at future date, fed up with having to replace power steering pumps used for hydraulic winches.