chris1450

you have two pins for a valve housing. The FI&B is the three step pin for the alpha shaft and beta shaft. The two step pin will only fit in the alpha shaft and beta position of the alpha shaft.

for the original 2 piece governor your P/N will be on the top of the filter bore and will be 582855 For the servo governor your P/N will be 714325-3 (civilian only) 714325-5 (military only, no beta switch) or 714325-7 The difference between the two is that the two piece governor is direct acting. It responds faster. The reliability problems have been solved IMO with a newer design bearing. The servo governor has 3 pieces. The pieces are the governor sleeve, pitch change valve, and pilot valve. The governor sleeve has o-rings that seal the governor to the valve housing. The pitch change valve is inside the sleeve. Both are ported appropriatly for the high pitch/ low pitch requirements. The pilot valve is inside the pitch change valve and is spun by the governor gear which has the fly wieghts mounted to it. When there is a speed change, the fly wieghts act by pushing moving the pilot valve inside the pitch change valve. This opens the ports between the two and hydraulicly moves the pitch change valve to high or low pitch depending on weather there is a over speed or underspeed. This is why it is called a servo governor and why it is slower acting.\ Hope that helps and sorry about miss spells lol