Re: Plan 'B' for Koyker loader on 656 (pic)

Posted by Allan In NE on July 07, 2007 at 05:52:19 from (148.78.243.24):

In Reply to: Plan 'B' for Koyker loader on 656 (pic) posted by tx656 on July 06, 2007 at 21:05:20:

You're really swimming upstream here because that tractor's original hydraulic system was never designed to run a high capacity loader.

"IF" you absolutely have to have the tractor's hydraulic system run the loader, the original configuration is the correct way to do it.

However:

The original front pump in that tractor really isn't big enough to handle the load the loader has placed on it.

The pump only had something like 12 gallon per minute output (very early 656s only had a 9 gallon pump) in the first place and 3.5 gallons of that are siphoned off right off the bat by the tractor's priority valve for the power steering.

That leaves you only 8.5 gpm to run that big loader. Could be as little as 5.5 gallon per minute flow if your tractor is one of the first and has the original little pump.

It is really, really gonna be slow and sluggish. In this configuration, the tractor's hydraulic lever would has to be held "on" so that the control can be handled by your Cross valves.

You have two options. Either replace the front pump in the tractor with a 17 gpm pump and this will give you "margin-able" operation of the loader at 13.5 gallons.

Or, run the loader from a PTO pump with a separate tank for the loader oil. This will give you something in the neighborhood of 19 gpm for the loader.

Yes, the tractor will have a noticable "grunt" when operating the loader. Normal.

Allan

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