I have a skid steer with aux. hyd's and an oil cooler(cooled by the fan) with a fairly large reservoir. It's not high flow but 16.8 GPM(no load) at 2250 PSI. I demo'd a hyd. rototiller that needed minimum 15 GPM. It was so much slower than a tractor driven it would have taken 10 times longer to do the same work. It got the hyd. oil quite hot.
Yes a lot of skid steers came with aux. hyd's but the machine you're asking about never came with aux. hyd's and probably doesn't have the cooling capacity, especially for continuous aux. operation. My machine is a 1994 43 HP diesel and doesn't put out anywhere near 25 HP at the remotes. It does have very fast hyd's for the boom however. The equivalent size Bobcat only puts out 11 GPM and is 36 HP. I can't see how you get 25 HP hyd's when the engine is only 37 HP and the pump is probably 11 GPM or less and no more than 2500 PSI. The larger machines(60 HP) with high flow hyd's and higher pressure(3500 PSI) use a dedicated high flow pump, larger capacity coolers and are only about 30 HP. Running an auger or a backhoe isn't the same as running something continuous that could encounter sustained high loads. Being that the machine is over 30 years old and doesn't have a cooling fan, even if you had a cooler, your friend could end up with a ruined machine that isn't worth fixing. Running the hydro trans also takes away power from the aux. hyds. as does having a load on them.
How often have you seen a trencher on a skid steer? Just because they make all these attachments for skid steers doesn't mean they work very good. If your friend is hurtin' for money, I just don't want to see him spend what little he has finding out it won't work the way he wanted. Does he have a small tractor he could run the flail with? Not as maneuverable but would work a lot better.
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