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Generators & Electric Motors General Discussion Antique Generators and Old Electric Motors: Questions and answers about restoring and showing old power generation systems.

Generators & Electric Motors General Discussion

stewart and Stevenson generator


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  #1  
Old 03-16-2019, 10:25:43 AM
metallica21156 metallica21156 is offline
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Default stewart and Stevenson generator

I have a Stewart and Stevenson generator that im trying to find if theres any info on it out there. I have already contacted them and they no longer have any info about it. Its powered by a 453 Detroit. Its rated at 50 kw and is a 230 volt 3 phase model. Im trying to get schematics of its wiring and controls. Any ideas where i can find anything?
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Old 03-16-2019, 02:43:49 PM
Wayne 440 Wayne 440 is offline
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Default Re: stewart and Stevenson generator

FYI- you face a substantial challenge. S&S has probably made 100+ different models of "50kW" Detroit powered sets. Post up whatever nomenclature you have such as model number etc, and a few good pictures.

This thread explains some things, but isn't directly helpful.

https://www.smokstak.com/forum/showthread.php?t=179175
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Old 03-16-2019, 11:15:07 PM
metallica21156 metallica21156 is offline
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Default Re: stewart and Stevenson generator

I will have to take some pictures tomorrow. The model is a 4-gd-50. S&S says it stands for 4 cylinder, generator, diesel and the 50 is the kw. I do know its static excited.
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Old 03-18-2019, 08:14:49 AM
metallica21156 metallica21156 is offline
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Default Re: stewart and Stevenson generator

This is the pictures
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Old 04-20-2019, 11:43:34 AM
Arkie Arkie is offline
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Default Re: stewart and Stevenson generator

Good Luck.

I tried getting info from them about gen sets and I could get more responses from whipping on a dead horse. (at least I could get a dead horse to quiver when I kicked it)

They do have service tech's scattered around and will make service calls to people or companies with deep pockets.

They prefer to sell their eq to oil companies and they are very tight lipped about furnishing any technical info, so as they can get service contracts.
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Old 04-20-2019, 12:19:21 PM
Birken Vogt Birken Vogt is offline
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Default Re: stewart and Stevenson generator

Back when S&S was the local Detroit/Allison dealer and sold other truck products my experience was less than great also.

I asked for some product by part number. They said here it is, quoted some outrageous price. I choked a little and he backed off by like 40%. Now if you can drop the price 40% right off the bat there is some serious padding. But I don't want to do business with a company like that.
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Old 04-20-2019, 03:58:10 PM
I like oldstuff I like oldstuff is offline
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Default Re: stewart and Stevenson generator

^ They're used to their fat lucrative government contracts and think you have the same pockets.
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Old 04-20-2019, 08:39:16 PM
pegasuspinto pegasuspinto is offline
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Default Re: stewart and Stevenson generator

Your controls look like they are in really bad shape, and they look like first generation solid state stuff. IMHO I'd do some basic tests on the gen end (continuity and insulation), rip off all the electrics, get the engine running, and they do a fixed field flash.

Does this unit use brushes? You may need a $$pricey$$ static exciter. I'd call Power-Tronics and see how bad it might get. They likely are familiar with your static exciter and/or your generator end itself and know exactly what needs to replace it. If not, they can usually do some basic electrical measurements and know what it needs.

In the end, you don't need S&S. It's a Detroit engine with some kind of not exotic generator end.

Last, once running and genning, I'd add a control panel. Deep Sea and others makes nice control panels for not much money.
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