Re: Farmall 300 Hydraulics Again

Posted by Owen Aaland on July 30, 2007 at 21:19:20 from (65.165.246.212):

In Reply to: Farmall 300 Hydraulics Again posted by Matt Weltz on July 30, 2007 at 19:43:38:

The hydraulic system on the 300 uses closed center valves with a constant displacement pump. The orfice and the unloader valve work together to control whether the oil goes to the valves or dumps back to the reservoir. When oil is not being sent to the control valves the systems has a standby pressure of about 60PSI so a little load on the pump is normal when you are not using the valves. As the valve spools and housings wear it is not unusal for this pressure to rise. If it gets excessive you drill out the hole in the orfice a couple of thousands of an inch to bring the standby pressure back down. That really is a last resort measure when every else is OK.

On a system that is being used 150 degrees is not excessive. You would not want to hold your hand on it very long.

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