There's probably some dirt on the seat of the relief valve that's built into the combining/sequencing valve... or mabey a broken spring or some such thing. Remove the priority pack, then carefully remove the valve next to the pilot line... then mark a reference mark on the setscrew in the back of the valve. Remove the setscrew counting the turns as you go... inspect, clean etc and reinstall. It'll probably work.
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Today's Featured Article - Fabricating Sidesheets - by Chris Pratt. The easiest and best first-time project for wanna-be sheet-metal workers like myself is flat or nearly flat metal cut and drilled to be a tractor's sidesheet. A sidesheet is sheetmetal to cover either the engine as in the case of early Oliver's, Massey-Harris' and many crawlers or the wiring and electrical components as in the case of the Massey-Harris Pony, Allis Chalmers' D Series (D-14, D-15, D-12, D-10, D-17, and D-19). The need for fabricating becomes obvious when you go to buy any of these
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