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Re: 560 tractor under load with no hyd funtions being


 
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pete 23
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Joined: 10 Sep 2009
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PostPosted: Mon Feb 22, 2021 8:31 pm    Post subject: Re: 560 tractor under load with no hyd funtions being Reply to specific post Reply with quote

The first thing to check is to make sure that all three valves (I assume you
have three) the single to double action adjustment are ok. The roll pin has
to be aligned in the slot on either S or D. Make sure the roll pins are not
bent because if they are the spool can turn too far and that will cause
system to stay loaded, on high pressure.

When that checks out ok, you will need to take the four bolts out of the
regulator valve cover. Note, heavy spring under cover so remove two corner
bolts and install longer bolt for removal.

Under that cover, right in the middle you will see a screwdriver headed
screw. That is the orifice with screen. Take it out and examine. Screen will
most likely be collapsed, plugged etc. There is a small .032 hole in the
orifice that may be plugged. Also, it may have original style orifice with a
small roll pin holding a check ball under it, over orifice. Throw that pin
and ball away. Then make sure the hole is not peened part way closed. That is
what happens over time.

You will need a very small drill bit or torch nozzle cleaner to make sure
hole is minimum of .031. I usually drill them out to about .040 to make up
for wear and leakage across the lands of the control valve.

You should also pull the piston with o ring out and replace with CORRECT o
ring. Not a substitute as they like to swell up and stick. Probably need new
gasket as well.
 
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