Hazelton, Kansas 6.75 miles N of Crowbar | The relief valve is a 2000 psi on that tractor (located in the remote valve stack). IH used the same dimension relief valve @ 2000, 2300 and 2500psi. I put a 2500 psi out of a 1566 in my 4386 and it made a new tractor as far as hyd. preformance. You might just have a worn relief valve. I would find a 2500 psi relief and install it in your tractor. Then check your pressure. At any rate you need to be able to check psi. Dirt |