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Re: Loader hydraulic too powerful

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Author  [Modern View]

08-09-2014 04:18:24

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petertay said: (quoted from post at 19:42:58 08/08/14) The tractor is an NAA with a Freeman loader from that era. The front PTO driven Hyd pump was shot so has been replaced. The problem is that the loader leaps up in the air when the lever is pulled, even if just barely touched. Apparently the new pump moves a lot more fluid than the old one.

The loader has very limited use as it wont move up slowly. It literally jumps up a foot in a split second. Replaced 1/2 inch the pressure hose with 3/8, but that did not help.

Any ideas? Some sort of reducer? --Thanks

Sounds rather odd.

Lift rate is linear with flow rate. If you double the pump volume you halve the lift time. So to go from say a 10 second lift time to a 5 second lift you would need 2X the volume. From your description sounds more like a 10X or more increase which would be a HUGE increase in pump size!!!!

It would be helpful if you could provide some empirical data rather than the rather vague description. Start with a part number for your new pump along with the size of the cylinders and the actual length of time it takes to fully extend the lift cylinders.

If your pump really is that much oversize you could add a flow divider but by the time you figure the cost of the divider and added plumbing it's probably cheaper to buy a $100 pump with the proper flow rate.


PS> The Freeman Thousand series loaders used either a 9 or 18 GPM pump with 1-3/4", 2", or 2.5" x ~30" stroke lift cylinders which makes this sound even stranger.
This post was edited by TheOldHokie at 05:44:17 08/09/14 2 times.

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