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18 gpm (at ~1400 engine rpm) will net you about 23 fpm bare drum, and up to 46 fpm full drum. IMHO, having variable control of line speed from 0 to 46 fpm would be a good thing.

18 gpm on the valve is going to slow down your max winch speed. 1500 psi relief is going to limit your max pull. get a valve with an adjustable relief setting to 'tweak' your max pull pressure setting. you can do this destructively (by means of shear pins) or mathmatecally - your choice.

golly, maybe i am as dumb as you say, but i'm pretty sure no one else can understand what the **** you're talking about.

neat. so what does that have to do with the OP's Cat motor that won't idle at 375 rpm?? apparently you've missed it, but the A3 coupling that i detailed retains the OE shear pin. there's also been quite a bit of testing and calculations performed to determine the under-rated-ness (real word?)...

alright, here's what the stock A3 system performance data would look like with the following assumptions: the pump estimates are similar to the stock A3 pump 75% worm drive efficiency 87% motor efficiency 85% pump efficiency 1.00:1 pump-to-engine ratio 850 rpm engine idle 3.003 cid pump 10.6...

fantastic, but i said 'max pull', not 10k lbs. this is different and based on the fact that the OE shear pins break at approx. 250ft-lbs. personally, it's not worth it to spend this kind of money on converting a winch for attaining less than half of it's capacity. and 195ft-lbs isn't correct...

this was already confirmed.

this will make for an extremely slow winch. this will only net you about 18 fpm max. even at this speed, you'll be maxing out that 300 rpm, and you'll be 50 ft-lbs and 300 psi short of making maximum line pull. northern tool motor 1042 would be a much better choice and it's cheaper. of...

this is the tank i was going to use. i have since acquired an 'A3 tank, though. it depends; if the valve you are using does not have a relief, then yes you will need this. if you are using a valve that has a pressure relief, then you would not need this unless you want an additional safety...

that motor stand doesn't look like my motor stand. anyway, here are some pics of the stock A3 parts that i have. specs: Motor - Parker 113A-106-AS-0, 10.6 cid, SAE A-2 bolt pattern, shaft: 1 1/4" dia. with 5/16" keyway. Motor stand - 4 15/16" bolt circle (4-bolt, 3.5" x 3.5") on winch...

let me take some measurements of the stock motor stand today/tonight.

like i said, there is a source for the couplings...

i've done a ton of research on this and have collected many of the parts already. there is only one part that you will have trouble getting off-the-shelf or fabricating and i have a source on that part - the winch input shaft coupling. the motor stand is off-the-shelf - i can provide...