D311 PTO /generator build

Running at 1500rpm will give you 50 hertz! You will need to turn the governor up to 1800rpm to get 60 hertz. If you know for a fact that in its previous life it ran at 1500rpm. If the Stamford is a 2 Bearing Generator(bearing at each end) you could put a speed changer, (belt pulleys or gear box) in between but it would be a lot of work. You should have less issue just turning up engine rpm.

Getting to 1800 is going to take a different governor group and governor spring plus change the rack setting.

Martin is a pretty savey welder and machinest. I'll bet he can whip up a mount for a belt or gear drive without to much issue.

Hi Martin,
If you want direct drive, then you need to change out the governor group for an 1800 rpm one, or put a 6-pole generator on it and run it at 1200rpm (and take a corresponding drop in output). Like Jeff writes, might be easy enough to put a couple of pulleys on to get your speed. By the way, it looks like the spring-loaded seal cap from the old fuel transfer pump input shaft is still stuck in the hole (no spring but possibly the two seal halves still there)

My induction generator needs over 1800 RPM to produce max output. It is a 25 HP and runs up to name-plate amps and a little over--78-80 amps depending on what's on the line, temp, etc. I don't pay much attention to RPM on this outfit. It's wattage that tells the story once it's on line.

Here's the rub. If that engine has a governor group similar to the ones in crawlers (mine is a rebuilt D2 5U, not a D311 unit), it's going to speed up about 30% over your operating speed if it should go off line. Overdrive the generator so that you will be speeding w/o full load at a slower speed.

I run at about 1500 or so on the engine; it jumps up to over 1900 rpm if there is a blip in the power demand, such as a momentary loss in the grid. I would prefer it didn't go that fast. Rules on distributed generation require that it stay off line for five minutes before it resets. If you are running 1900 with a 30% governor lag, you will be up to 2470 or so on a blip, and be there for at least five minutes. I'd say to avoid that. Find out what your governor is going to do before you commit to expensive drive parts.

I overdrive with a four-belt B section band on sheaves that are good size--about 10" PD on the smaller (driven) one. It holds the 19 kW load indefinately without heating up, runs very smooth, helps take the radial vibration out of the drive and has been adjusted just once since new. It's in operation for it's third season now, no problems. Make no mistake about it, a four-cylinder diesel will give you a bunch or radial vibration even with that 100#+ flywheel.

This has been an adventure. Screw your hat down tight, grab a handful of mane and enjoy the ride!

That is true, but the governor overshoot is still a problem that needs considering. A package generator set from the factory would have an overspeed safety switch of some sort.

The D311 he has is set up for 1500 rpm, so presumably it can handle a sudden loss of load when running under full load at 1500. A set of pulleys and belts makes a good way to connect an engine to a 2 bearing alternator. I have a D333 and a D311 that are belted to jackshafts to operate stationary pto driven implements. Both have B belts that have been on there for many years with only an occasional retensioning. To further reduce side loading you could go to a cog belt drive if you wanted.

thanks boy's for all the info. generator was a auction sale deal so it was never hook up to this D311. thanks OM for the info on the governor i that was the info i was looking for. was not sure if i could just turn it up or if i need new insides. maybe i will just get it running and get a nice skid under and see what others generator i got that would be more suited how meany KW can i run with 49 HP? i don't really have a need for it "yet" lol. might work good to power my saw mill but then i would have to go logging to get some logs and well then Roger with think i need to hire him to do my logging.

Your 49 Hp would handle a 35 KW generator at your rated speed of 1500 rpm.