1086 Hydraulic pump unloading issues

E503

New User
Hydraulic pump is at high pressure unless 3 point control is all the way down unloading pump pressure. If I am understanding book correct unloading valve on top of 3 point cover. I looked at it and do not find any obvious issues. With blow gun can not get a lot of air flow through valve and think there is problem with unloader. Return line though outlet controls is unrestricted to transmission case.
 
Question, does the hitch go all the way to the top and stay there regardless of the position control lever? If it does the draft control spool valve is stuck. This will cause hitch to fully raise and bottom out the cylinder so there is not further raise movement possible. If that is not the case, are all aux valves working freely and return to neutral. When those two things are ok, you can be pretty darn sure the problem is in the unloading valve.
 
Three point did go up and down with lever but anyplace lever was stopped pump pressure was enough to open main relief.
I will clean and assemble 3 point and put back together.
If test still shows bad unloader will replace.

Thanks
 

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