What hydraulic motor would be best for a pto motor on an 1845C? I see the specs show the 1845c has 16 gpm flow at 2300 psi. I'm thinking the 4.95 cu in motor here would work, although I'd have to throttle about 3/4 throttle to get around 540rpm at 12gpm. I plan on running a tiller with it, so speed really isn't important.
Depending on what torque range hyd motor you are using ..... but you are pretty close to being bang on with what you have chosen for the displacement ...... I JUST finished doing a simular conversion on your twin ... the 1840 ..... same engine HP, same gpm and psi ..... I mounted a converted PTO Allied/Buhler snowblower ......for what was there (engine HP/GPM/PSI) it worked awesome ....... the hyd math is : (16gpm x 231) divide your hyd motor disp. (4.95) into that = 746.6 rpm ... but that is at 100% (which is free wheeling) ... take 80% of that = 597rpm under load and you will hear the diesel load up, so you'll probably have it at wide open throttle and once the engine starts to work it'll be bang-on ..... have fun.
I'd like to convert a blower also. Used 3pt blowers can be found a heck of a lot cheaper and easier than a SS/hyd blower! What is the math for about 40gpm? I have a Gehl 7800 with up to 40 gpm on the std. 2 hose aux circuit, and I don't know how much on the 3 hose, high flow side, I've never used it. From your experience, how wide of a snow blower could I use with my available GPM? Some where I remember reading the hyd. hp rating, but I could not find it just now. I would mostly be using the blower to "blow back" after previous accumulations and having run out of space to put snow with a reg plow. So in other words I'd be burrying it, most of the time, not just getting rid of a regular snowfall. I'd like to convert a dual auger 84"+ unit.
There are a few guys out here that are using hi-flow blowers (like myself & KSSS) ....most of the blowers that are capable of handling up to 40 gpm are using the 6000 series Eaton Charlynn motors ........ mine is the commercial Buhler 84" with 2 motors (1-fan, 1-auger) and they're both 11.9 cu.in. motors..... mine are not direct drive like some of the other brands out there, it is set-up with chain drive on both individual functions ...... myself I wanted that so I could play with the sprockets to fine tune the rpm's of the fan (which I did), before I did that it was a 1:1 ratio on the fan .... if you are thinking of using a pto version most are also 1:1 direct drive thru the gear box, the jack shafts 1:1 rpm is adjusted at the sprockets down to from what I remember to 200rpm on the auger ....... the math you ask was (37gpm x 231) divided by 11.9 = 718rpm x 80% = 574.5 rpm at the fan (Bcats hi-flow is only rated @37gpm) ... your 40 gpm will be about 621rpm at 1:1 on the fan ....hope this helps you out a bit ...cheers