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Power steering cylinder with integrated control valve

B

Bart CA

Member

Hi, Last year I bough a John Deere model 710
the previous owner gave me a replacement power steering cylinder to replace the one on tractor which leaks. I installed the new one but it does not work properly. It is a cylinder with integrated actuator valve when the steering link push forward the tractor turns right when pull backward the tractor turns left. There is an Allan screw aprox 1/4" diameter screwed in the valve actuator and it is in a semi circular slide it limits the valve rotation to aprox 1/4 of a turn I wld like to know the purpose of this screw it seems to limit the control valve movement.

Thanks in advance

Bart
 
Here is a drawing of the system

I wd like to know the purpose of the screw on the valve actuator lever.


Thanks in advance

Bart
p7184.jpg
 
I think (but do not know) that it is a centering screw that adjusts the location of the actuator in the valve so the unit stops adding assist when the spool is in the center of its travel. JimN
 
When rebuilding these, and testing on a hydraulic
test stand, the screw should be adjusted so that
the cylinder is "centered", and then it should
be "locked" by means of a jamnut.
and,(speaking as an ex aircraft hydraulic
mechanic), on aircraft we safty wired them.
 
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