Check auxillary pressure at tilt cylinder--should be 2250 (+or-) 50 psi---is the spool in valve stroking full in and full out? -- If pressure is out of specs, possible faulty aux-relief---does mast drift forward by it self when sitting with load?--If it does packing in one or both tilt cyl's leaking--main pressure 2850psi---steer--1300psi