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FYI.... eBay seller '2003viperkillingcobra' regularly has rebuild kits for the Zenith Mechanovac governor speed sensing unit. Look up his seller name or just search for "mechanovac". With that kit and a Holley kit for an 885FFG carburetor (to cannibalize for the diaphragm) you have everything...

A few more... Pic 1 - This is the front of the label that came attached to my NOS Governor speed sensing unit I got on eBay from Vietnam. Pic 2 - Here's the back side with instructions. Pic 3 - Here's the NOS Zenith Mechanovac speed sensing unit from Vietnam. The connector on the left side...

Here's a few more pics of the diaphragm in the slave unit... Pic 1 - Shows the brittle old Zenith diaphragm on the left and the new Holley on the right. I have already removed the Holley pull rod and enlarged the center hole, it's ready to install. Pic 2 - This is the way the Holley...

Finally some progress! After leaving the governor slave assembly to sit a while, I recently decided to try to take it apart.... I was pleasantly surprised to find that it came apart easily. I simply took the two valve plates out of the valve body and then put pressure on the shaft with my...

Hey Marcus! I hadn't noticed you had posted to my old thread, thanks for the help. I have that manual.... The problem isn't really adjusting it, it's that the slave unit / throttle body portion of the governor is seized up. It looks like there are ball bearings on both ends of the butterfly...

Hi Group, Zenith never got back to me and stopped responding to my e-mail. Oh well, I doubted they were going to be able to help much but I'd prefer not to be left hanging. My NOS Mechanovac Speed Unit arrived safely from Vietnam today.... Awesome! It's in brand new condition and has a tag on...

Too late, I bought it as a spare. Zenith responded to my initial e-mail by asking for more information, I gave them what they requested and have not heard back.... I prodded them gently this morning. Another interesting discovery - The diaphragm from the Mechanovac governor and the diaphragm...

Thanks for the help guys! Yes there are lots of other trucks that use these governors, including M49, M49C, M50, M60, and M108. That's why I'm surprised I haven't easily found the appropriate TM and repair kits. David, yes I have that manual but it's not in there.... One of my other manuals...

Hi Group, My Studebaker V-18A/MTQ Earth Borer - Pole Setter has a Zenith Mechanovac Auxiliary Governor on it. This is a constant speed governor (to keep the engine RPM constant while operating the pole-setting mechanism or rear winch) that is totally separate from the governor that is integral...