Case IH 485 pto stops working

[wmoore77]

Last spring my shuttle shift and pto went out in my 485. We rebuilt it this winter finding a broken bolt in the shuttle clutch pack
we put everything back together and it worked fine.   
 

We started mowing hay with it this past week.  It does great for a few hours then the pto stops 

everything else works fine just the pto 

you can jerk the pto handle back and forth and it will start back and then stop again sometimes 

once it cools down a few hours it will work just fine again till it gets hot 

Any thoughts would be appreciated 

[HydroTek]

Check at the MCV the pto control spool
junk likes to wedge in the linkage
I have see all kinds -- gloves, hitch pins, beer cans
stuff from behind the seat falls in there

The spool pushes pretty much all the way down
and all the way up

other option is that the seal rings in the pto shaft were damaged on install
or there is a problem in the pto clutch

[jimb2]

Hi as @HydroTek says and see below for PTO pressure check procedure.