Is your pump putting out the correct pressure? I would first check that before trying to adjust any linkage. You can check the pressures at the top cover. Check out the thread in the Massey classic/vintage section titled hydraulic pressure and external hydraulic feed posted by oilystairs. Hutch who goes by shona13 replied on May 29th, explains where to check the pressures and what size the fittings required. Is the fluid level low? dipstick is on right hand side behind your foot with the draft response lever.