Almost sounds like it's 'gorfed up' and needs to be cleaned. Also had a '51, wasn't hard to clean. Remove from tractor,then carefully dissassemble the valve. be SURE to do this on a nice clean, white old bed sheet under real good lighting !! if not one of those 'check valve' balls WILL go 'walkabout' onto your concrete floor then you'll spend MORE time finding the escapee than cleaning the valve assembly.......
be sure to print off 2 copies of the drawings of what goes where,as Mr. wind will magically transport it 'far,far away' never to be found again....
In my case there was enough 'gorf' (old oil,dirt ??) to keep something from sliding in one of the passages. I cut out a new gasket,though OEM ones are probably still for sale.
it's not a terrible job, just have patience and don't lose a ball !
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