Calling Dave Kamp

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   Toothed-belt drive- a Carlisle Panther RPP... like Gates PolyChain... about a 2:1 ratio.

The pump... I don't recall the brand, it's Italian, if I remember correctly, it's about 0.72ci per rev displacement.  The unique feature is that it has an integral priority valve.  Priority valve means that the output's full flow is made available to the priority port, and once that's satisified, the other port gets all the rest.  I have the priority port plumbed to the steering valve, and the main work port goes to the loader valve... that way, if there's any problems, it looses loader FIRST, but idle it down, and the steering still works just fine.

(I edited this because it's not a 1.2gpm pump (I confused it with one I used on a different project)... according to my notes, this one is about 0.72ci/rev.

Edited by DaveKamp - 20 Dec 2016 at 2:10am

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DaveKamp Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Apr 2010 Location: LeClaire, Ia Points: 6036	Post Options Post Reply Quote DaveKamp Report Post Thanks(0) Quote Reply Posted: 19 Dec 2016 at 10:51pm
	Toothed-belt drive- a Carlisle Panther RPP... like Gates PolyChain... about a 2:1 ratio. The pump... I don't recall the brand, it's Italian, if I remember correctly, it's about 0.72ci per rev displacement. The unique feature is that it has an integral priority valve. Priority valve means that the output's full flow is made available to the priority port, and once that's satisified, the other port gets all the rest. I have the priority port plumbed to the steering valve, and the main work port goes to the loader valve... that way, if there's any problems, it looses loader FIRST, but idle it down, and the steering still works just fine. (I edited this because it's not a 1.2gpm pump (I confused it with one I used on a different project)... according to my notes, this one is about 0.72ci/rev. Edited by DaveKamp - 20 Dec 2016 at 2:10am
	Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest.

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DaveKamp Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Apr 2010 Location: LeClaire, Ia Points: 6036	Post Options Post Reply Quote DaveKamp Report Post Thanks(0) Quote Reply Posted: 20 Dec 2016 at 2:16am
	Pump is rated to 1800rpm... with a 2:1 drive ratio, the engine governed at 3600 is perfect. .72ci/rev at 1800rpm comes to 1800*0.72ci=1296ci/minute or 1296/231=5.6gpm, which seems excessive considering the bucket lift and curl rams are so small, but remember that I have hydraulic steering AND... when I idle the engine down, I like the steering AND bucket to work just fine. I generally don't run the engine at much more than 3/4 throttle, because the transaxle drive ratio is rather fast. When doing delicate bucket work, I like to run it slow and gentle, and still have flow on the pump. And for what it's worth, the 12hp K-series was 'strong'... because when I rebuilt it, I planed the block and head, used a taller piston and forged rod, so there was plenty of compression. It was probably more in the 15hp range... at least, until something inside came unglued. One of these days I'll open it up for a look.
	Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest.