RJ
Guest
Cab noise can come fron several sources. Anything that touches the air ducts going to the left and right front cab posts can cause a noise. Reposition as needed to get clearance from the air ducts. Also watch the hydro and throttle cable routing especially as they go through the cab wall. If the noise varies with going up or down hills, it is probably hydro pressure related. If the above didn't cure the problem, an hydraulic attenuator can be installed in the foot-n-inch supply line that goes to the pedal in the cab.