I have a Allis D-19. When I raise the lift arms they won't stay in the up position,they slowly drift back down. I have unhooked the draft control cable,thinking maybe this would be causing the problem.This did not help. Any suggestions?
 
Mine has the problem. A mechanic told me there is a seat with a steel ball and the seat is not true and if not to bad, take a brass hammer and smack the ball with the right amount of pressure and reseat the ball. Kind of hard to plow when you can't keep the arms up.
 
You need to replace a little brass washer in the hydraulic remote for the lift arms. It's hard to find in the repair book, you have to look real close to see it. The part number from AGCO is 239119. It is listed in the "ball check assembly" portion of the service manual. On the top of your 3 spool valve body, there is a round raised, screw in piece. Inside that piece is a check ball and spring, along with a little brass washer that sometimes just falls apart or wears until it is completely gone. I would say that either the ball is damaged, or, more that likely, your washer is gone or severely warped so as not to keep the ball sealed and therefore letting your oil seep through and drop the arms.
 

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