Charles Todd said: (quoted from post at 20:24:53 02/10/08) Ok, I need 12-15 GPM and would like to either use belt or chain. Chain seems the strongest, but has issues with maintenance and transmits harmonics (vibrations). This cogged belt you speak of, you mean like a poly-chain, with teeth on the pulleys and the belt, like on servo drives?
Where would I take the input (pressure side) from? Where would I send the excess (return side)? The only hose I know of is the output from the main pump feeding the tractor and remotes.
I liked the chain setup on the picture posted above.
The chain drive above works well for that person, but it is used at low speed (1/2 throttle or less) and it is in town so they don't have to contend with any dust, mud, etc.
Personally, If I were to put a separate pump on for the loader I would purchase a reservoir/tank just for that system and keep it separate from the tractor hydraulics...
Another thought I came up with is to check on the possibility of an optional pump for the tractor... some had choices of around 9 GPM, 12 GPM and I think there was a 15 GPM pump option too. I'm not sure if that's a possibility on a 504 though.
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