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Sammy: You might have a check valve problem. See if it settles if the throttle valve is seated. That will efeectively divided the problem between inside or outside of the Powr-Trol box. Unfortunately, even with all the repairs, you could still be a failed gasket, the seals on the lift piston, you can have internal leakage past the inner or outer check valves, or some other internal leak. Place a load on the rockshaft like a heavy implement, and 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. 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). Frank-in-Tallahassee
70D // 855
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