I’ve been struggling though restarting my old D6. It ran when I parked it 2 years ago. Anyhow, it won’t start so over a period of a couple months I have cleaned out the fuel system (pony, too). It’ll fire on ether. So, reading the archived posts I figured out that the rack must be stuck. One of the tips was to slam the fuel lever forward in case there was a problem in the detent. So I tried that and now it won’t move out of the shut off position. It will wiggle a little forward and back and I can hear and feel a ratchet mechanism. I used to be somewhat familiar with Woodward governors but I have never touched a Cat governor. Any suggestions? (BTW - The fuel control lever used to move from stop to full throttle) Thanks, Craig

Have you tried moving the lever on the side of the governor?

If you decide to go into it I think you’ll want to take off the lever and then the ratcheting detent housing behind it to expose the Spring loaded idle stop detent.

I always say to PULL on the lever hard and now you probably have done that plenty
already

Easiest way to confirm the rack is stuck is to remove the side cover off the injection pump housing. The rack should slide fore and aft with gentle finger pressure. If it is locked then you can go into the governor and free it up.

I do have the fuel lever disconnected from the operator linkage. I pulled off the round cover and saw the ratchet grooves and the two pawl assemblies. I didn’t pull them out since I didn’t know if there was any timing involved or if a ball bearing (or something) would roll inside the governor and end up somewhere it didn’t belong. I have a 318 engine manual so I’ll take a closer look at it. But something is definitely limiting the fuel rod travel since it only has an inch of wiggle travel and then stops hard. I did pull the cover and sprayed the fuel pumps with a penetrating oil. They don’t look frozen but looks can be deceiving. And, with the fuel lever/governor locked up there’s not too much that I can tell. Thanks for responding - I genuinely appreciate it!

If you watch the fuel pumps while spinning the engine over they should go up and down while riding on the cam--they can get stuck in the up position

Thanks! If it ever stops raining here in southern MO I’ll pull the cover and check them with engine turning over.

I didn’t go ape but I did give it a solid quick push forward. I treated it the same that you’d treat a firearm - no forcing etc. I’m sure I’ve accidentally hit the throttle that hard with my knee or elbow when operating the tractor. I’d say that it jumped past a stop or limiter since there’s only an inch inch of travel with a hard stop both ways. I hope I didn’t break something! It’s been raining for a couple of days so I haven’t been able to open it up and work on the issue.

There were 3 stuck pumps which I managed to gently free up by pulling off the injector lines, blowing out all the diesel, and filling the pumps with penetrating oil. I tapped them gently with the engine rolling over. All 6 are now free. The governor is still stuck in the fuel off position(fuel lever towards the front). I didn’t get to to try to start the main engine because the carb float decided to get stuck and literally flood the pony cylinders. I pulled the plugs and blew out the gas - with the mag off... I’ll let it dry overnight. It’s always something!

I opened up the governor and disconnected the link to the rack. The rack moves freely all the way in and out. I cannot see any obviously broken parts. The spindle is free and the springs are all attached.

However, I still cannot advance the fuel lever out of the stop position. Can the stop lever assembly get bent out of position? It looks pretty tough. Or can the shut-off assembly move?

I will try to attached 2 photos show the limit of the stop lever against the brass stop. I have about 1/2” of play and that’s it.

I’m at wits end since I’m not familiar with Cat governors.