I worked on a 450 a while back and had this issues as well, so I learned quite a bit. Have you hooked a gage up to the inlet hose of the PS? If not try this and look right when you start the tractor, if it goes up quickly and then backs off it is probably the auxillary check valve. On the one I worked on the spring was worn and would not put the proper pressure on the ball and let fluid pass thru. This is removed from the bottom of the block. Good Luck and let us know how it turns out!
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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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