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Max: There are several things it could be. There is a gasket that can fail, the seals on the lift piston can fail, you can have internal leakage past the inner or outer check valves, or some other internal leak. Neutral is where the pressure oil is stopped and trapped along with the returning oil. If all seals are right and tight, it should stay right there. If it's falling down from neutral, you either have an internal leakdown in the PowR-Trol box, or more typically, a leaky O-ring/seal in the rockshaft cylinder or a blown out cylinder to rearend housing gasket. If it's the gasket, this can also make the transmission oil level grow as the oil leaks past the gasket and into the tranny/rearend oil. If you have some kind of load you can place on the rockshaft like a heavy implement, you can test it to find out whether it's an internal box or cylinder leak. To check the piston seal, raise the rockshaft with a load & back the throttle valve adjusting screw all the way out until it is clear of the valve so the valve stays seated. If the rockshaft still drops, it is either the piston seal, blown cylinder gasket, or even a cracked housing casting. If it stays up with the throttle valve closed, it's in the PowR-trol box. Also, if the oil level doesn't go down in the PowR-Trol and up in the tranny, it's probably the piston O-ring or leather (very common). Not an expensive repair, just heavy, awkward, and dirty. BTW, The throttle valve is behind the tall nut that sticks rearward from the Powr-Trol housing. Don't confuse it with the one that sticks out of the drivers or left side of the P-trol box). Lastly...make certain that your are using the correct plugs on the P-trol box. You don't want the ones used for remote cylinders, which have pipe thread holes for the cylinder hoses. some people incorrectly remove the hoses and put in pipe plugs but that is not enough to make them work. We can cover this if you can't get it resolved by these tests. Frank-in-Tallahassee
70D // 855
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