Peter,
The hole in the seat for the operating valve is 1/4 inch diameter, so the force
exerted by 650 psi of pressure is about 3 lbs. I believe the spring is rated at
5 or 6 lbs. Going from 450 to 650 increases the force required from about 7 to
8 lbs. You might check your spring and whether you have something binding
somewhere, like a bent rod?
Peter Vucinic wrote:
> The overdrive will engage if I manually move the lever forward, applying a
> substantial amount of finger pressure to the lever.
>
> I am now wondering if the gear box oil pressure may be causing the problem?
> E.g. higher than STD operating pressure, solenoid/lever is not able to over
> come the pressure.
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