1840 hyd connections

Phil 25

Member
morning: The neighbor arrived for the summer and decided last summers brush mowwer damage should be fixed...ok but he removed the front
end loader also last summer...and ran it all summer
Since then the 3pt hitch arms have a constant, small and very quick vertical jerk motion, once a height position is chosen, also a noise
is heard from the interior somewhere, no clunks or bangs but a sound that goes away when the 3pt is moving., and comes back after the lift
position is settled in about 30 seconds.
The "shimmy" is barely visible at the tractor side, but 8 ft out the tail wheel moves about an inch.
I suspect the 1840 loader control valve, had a oil flow thru design from hyd pump and back to reservoir, and now that he has taken the
whole assembly off, the supply line connection is dead ended.
It's not a JD loader, and i was told that JD uses's a "closed" center on their hyd systems. which would be mean the control supply line is already closed off?
Am i going in the right direction, or has a safety valve failed internally? or the valve is working right but shouldn't be?
tks
 

If loader no matter what brand had correct valve with closed center plug then removing loader from tractor will have no affect on tractor hyd system. My guess with 3 pt hiccuping is either 3 pt piston seal or control valve is leaking a little or possibly the control valve clearances are too tight. The valve clearances can be adjusted by removing a plug on RH side of rockshaft housing. 1st try relocating position of short L/D control lever under seat.
 

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