What J Schwiebert stated is right-on. It depends on the loader and what size cylinders it has. The bigger the cylinder, the more longer they take the fill and the bigger pump needed for speed. Generally, the bigger the pump the better - since it will work a lot nicer when the engine is running slow. As long as you have an open-center system, and the valve is big enough not to obstruct full-time oil flow, a big size hurts nothing. Also keep in mind that when you cite GPM figures - they mean nothing without RPM. One pump will be rated at various GPMs at different RPMs. Cubic inch displacement is a more reiliable figure. Generally speaking most good loaders use with engines that run a max of 2400 RPMs use 23 GPM pumps. Some light duty loaders with small cylinders use 9-13 GPM pumps and work kind of slow.
My IH 3414 backhoe loader uses a 9 GPM pump and is just barely adequate.
My IH B-275 with a farm loader has a 7 GPM pump and is very slow.
My Ford 4000 loader uses a 23 GPM Cessna pump and it works great.
My Ford 641 with a farm loader has a 23 GPM Cessna and works very well.
My Deere 420 crawler-loader has a 13 GPM Cessna pump and is slow.
My Deere 1010 crawler-loader has a Webster 23 GPM pump and works great.
My Case 580 CK loader has a Cessna 23 GPM pump and works great.
My Oliver OC4 loader has a 23 GPM pump and works great.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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