D311 Generator Questions

I would guess its around a 1955, would need the serial number to give a better Idea as to the age , I have the slightly older version(4V serial no) that is still a d311 but runs 1200 RPM to make 20 KW, if yours is a 30 KW it likely runs 1800 RPM to do it (and will have a 6V serial no).

Most are set up for 3 phase and people want single phase. My electrical knowledge is limited so I will let someone else comment on convertibility. If you use the search function you will find lots of info on the subject.

Some came with factory electric start and I believe all are set up for it, glow plugs are usually fitted for electric start units so that might be a consideration

Manuals come up on e bay on a regular bases.

Keep in mind there is a much newer 311 cat engine also so don't confuse the manuals, the newer has the injector pump on the opposite side of the engine.

Reliability is excellent, mine has 7000 hours and runs like a new one.

I would guess its around a 1955, would need the serial number to give a better Idea as to the age , I have the slightly older version(4V serial no) that is still a d311 but runs 1200 RPM to make 20 KW, if yours is a 30 KW it likely runs 1800 RPM to do it (and will have a 6V serial no).

Most are set up for 3 phase and people want single phase. My electrical knowledge is limited so I will let someone else comment on convertibility. If you use the search function you will find lots of info on the subject.

Some came with factory electric start and I believe all are set up for it, glow plugs are usually fitted for electric start units so that might be a consideration

Manuals come up on e bay on a regular bases.

Keep in mind there is a much newer 311 cat engine also so don't confuse the manuals, the newer has the injector pump on the opposite side of the engine.

Reliability is excellent, mine has 7000 hours and runs like a new one.

[quote="Steve A"]I would guess its around a 1955, would need the serial number to give a better Idea as to the age , I have the slightly older version(4V serial no) that is still a d311 but runs 1200 RPM to make 20 KW, if yours is a 30 KW it likely runs 1800 RPM to do it (and will have a 6V serial no).

Reliability is excellent, mine has 7000 hours and runs like a new one.[/quote]

I would think the engine RPM relates to the frequency. Power output relates to the windings. It does however make since if the gen has to output more power it may require a faster rotation.

Just saying more info is needed.

50 cycle unit is different generator and exciter.
Factory single phase units are rated higher than 3 phase units.

Now if someone would come forward offering to swap a 3 phase for a 1 phase unit!
3 phase units are very common place as stated and most likely 12 leads.
1 phase on 10 leads, I would say are not convertible to 3 phase.....?
Either way, Nice score on the Unit!

Now if someone would come forward offering to swap a 3 phase for a 1 phase unit!
3 phase units are very common place as stated and most likely 12 leads.
1 phase on 10 leads, I would say are not convertible to 3 phase.....?
Either way, Nice score on the Unit!

[quote="drujinin"]Now if someone would come forward offering to swap a 3 phase for a 1 phase unit!
3 phase units are very common place as stated and most likely 12 leads.
1 phase on 10 leads, I would say are not convertible to 3 phase.....?
Either way, Nice score on the Unit![/quote]

Three phase units are normally 10 wire also.

[attachment=25975]311R.jpg[/attachment]see attached data plate for my 1200 rpm 20 KW Rated unit with a 4V serial no,

I will be interested to learn your serial number

e mail or PM for the attached spec sheet in higher rez

The spec sheet also states the 3 phase unit is rated at 21 KW at a .8 PF

The single phase unit is rated at .9 PF

I haven't figured out Power Factors so don't ask 😊

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