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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

PowerBack 5250 watt Generator Question


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  #1  
Old 07-02-2014, 07:47:45 PM
Hummer Hummer is offline
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Default PowerBack 5250 watt Generator Question

I have a chance to get the above. Has a Tecumseh engine. Anyone have any experience with these?

Supposedly it is a brushless and 6500 watt surge. Can't find any information much on internet about this model.

Anything anyone can tell me would be appreciated.

Anyone with manual info etc I could get please send to ac4ht@aol.com

Many thanks guys
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Old 07-05-2014, 12:29:19 PM
Hummer Hummer is offline
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Default Re: PowerBack 5250 watt Generator Question

Update: I went up for a looksee and owner got it cranked long enough for me to check the voltage was being put out but RPMs needed adjusting downward. He pulled the float bowl and had about 1/8" of dried gas in bottom so obviously the carb is going to need to be pulled down for a good cleaning and adjusted.

He had just put a new fuel hose on it and a filter as the other was deterriorated. He had also put half a can of Seafoam in the tank before it got cranked.

When it ran it did not smoke and was smooth.

There is some crud in the fuel tank so will pull it off and see if I can't wash it out.

Only other problem I can find is the grommet for the fuel cut off in the bottom of the plastic tank got tired and needs replacing. I have found them from 5.00 (original black neoprene??? to 20.00 of which there is a replacement for the original and the new ones are made with Viton. Part N103455 which seems to be a very common grommet for the plastic tanks.

This one is apparently the latest revision as the normal 120V receptacles are for the 20 amp plugs (I-) where a pic of a earlier version only had 15A (II) receptacles.

It has two breakers (20Amp) on it.

Also has handle bars and wheels and is not that difficult to maneuver so I guess it is a keeper. Hopefully the carb will "come in" with a good cleaning.

As of this writing I have $165.00 in it. Will be interesting to see how it does on a long time run under load.

I got a 5 qt jug of Mobil 1 synthetic 10W40 I will put in. I did read it was not supposed to be operated above 104F ambient and it gets close to that here so figured the Mobil 1 would be the way to go.
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Old 07-05-2014, 02:59:09 PM
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Default Re: PowerBack 5250 watt Generator Question

Update 2 Just went and parted the grommet from the petcock valve and blew into one intake and it was completely gummed shut.

There was gas residue on the intake barrel of the petcock that held he grommet in place. I tried several remedies and finally put some straight Seafoam on it and it came right off.

I rigged a B&S gas tank from a lawnmower on it and added about a quart of non ethenol and some Seafoam and letting it gravity feed down to carb hoping it will do its magic and free something up.

A close look at data plate says it is a GT5250-2 that was made in 2000 and the sticker confirms 104F as top ambient temp.
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Old 07-05-2014, 07:34:45 PM
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Default Re: PowerBack 5250 watt Generator Question

Update 3:

Got it cranked off and it spit and sputtered for 30 minutes and I just let it run and get hot with a mixture of 87 octane non ethenol and Seafoam. It finally settled down and I let it run with about 2800 watts on it for another 30 minutes and got it stabilized putting out 118 thru 122V.

Plugged in another electric heater and cut it back to medium position which I estimate was about 3800 watts and it pulled 114-116V. Next I plugged in a 175 watt mercury vapor light and it ran about five minutes and tripped one of the breakers.

I was running the four prong plug with outlets at end of each hot leg and a multimeter in one of the 120 outlets on the unit to watch the volts.

I will let it soak some more this evening and give it another go tomorrow and try and determine exactly what the load was when the breaker tripped.
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Old 07-06-2014, 03:23:20 AM
armandh armandh is offline
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Default Re: PowerBack 5250 watt Generator Question

I have a Coleman 5Kw with a 10 HP Techumseh
the engine instructions call for an oil change every 25 hrs of operation
thanks again john for fixing that burnt valve

each side of the 120-0-120 is good to only half the total watts

20A x 120 V =2400 watts per side 4800 max continuous if the breaker sizing is to be believed
a brief overload may not trip the breaker but better the breaker than what ever holds the magic smoke!
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Old 07-07-2014, 07:20:21 AM
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Default Re: PowerBack 5250 watt Generator Question

Armandh,
I just opened the thread up as I have just come to the same conclusion or thereabouts as follows:

I have a AMWATT so I know exactly what each device is pulling and one heater is pulling 1385 watts and the other is pulling 920 for 2305 and it trips in about 10 minutes.

The other leg is pulling 1435 and 700 for 2135 and does not trip.


I reversed the heaters and the breaker with 2305 tripped on the other side as well and the 2135 did not.



I thought next time I run it I am going to adjust loads to 2200 watts and 120V per side and see if that is acceptable to it as it should be a little over 18 amps pull per leg. Apparenty the breakers on this thing are very sensitive as they are tripping at a little over 19 amps.

I dumped the oil that was in it and replaced it with Mobil 1 10W30 High Mileage.

Doesn't look like the carb needs to be pulled down just yet as the Seafoam and Lucas Injector Cleaner seems to have done their jobs.

Gotta run to town today and hoping to get a grommet for the bottom of fuel tank so I can hook up the original tank. Going to try and get one made of Viton.

Would love to get manuals for this thing.
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Old 07-07-2014, 08:27:29 AM
Ed Sparks Ed Sparks is offline
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Default Re: PowerBack 5250 watt Generator Question

about a two minute google search SHOWS THIS SITE WITH THE MANUALS
http://www.allpartsinc.com/ProductDe...code=GT5250-WK

you are welcome

By the way: if you put more than a 5000 watt load on these: they will belch out the magic smoke that will never go back in.
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Old 07-07-2014, 10:07:07 AM
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Default Re: PowerBack 5250 watt Generator Question

Ed,

First off I can just barely make 110 using idle adjustment and no load.

Can't say about the 5000 watt load but just ran a quick and dirty load test and if I apply 2246 watt load (AMWATT readings) I can only adjust it up to average 110V which is a hair over 20 amps and of course about 8 minutes later it tripped.

The adjustments top out with a 4282 watt load( both legs) at 110V average (109-111V on Greenlee digital meter). The 2036 watt load did just fine at 18.5 amps. After it trips it hums along at 116-118V with one tripped breaker.



I did a search and found some parts lists but not that site but I have it copied on my file for this unit now. Thanks much.

Thusly I guess it should have been named a POWERWANNABEE. But looking on the bright side my Honda EZ3500 will run fine with total load of 2530 watts and trips breaker at 2540.
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Old 07-07-2014, 01:04:57 PM
uglyblue66 uglyblue66 is offline
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Default Re: PowerBack 5250 watt Generator Question

I worked on a couple of these over the winter.
You can punch in the engine numbers on partstree.com and get the carb part number and then copy and paste it into the ebay search. a carb can be had new for about 35 bucks.
Well worth it. I could not get either of the 1's I cleaned to work correctly.The new carbs worked well.
They are so leaned out and made for 1 speed it takes the machine a while to warm up and run right.
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Old 07-07-2014, 01:35:09 PM
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Default Re: PowerBack 5250 watt Generator Question

uglyblue66

For sure. I read in some of my searches to not even plug anything in for at least five minutes so it will warm up correctly.

Was also thinking about cleaning carb and hoping the Seaform and Lucas and carb spray would do it. Guess I will have to pull it down and see what else is gummed up. There is still some gum in bottom of float bowl and one would like with gas having been in it for two days it might have done the deed but apparently not.

I had to let ethenol gas soak in my Onan 2.5 tank for a couple of weeks to dissolve everything. Turned it bright yellow.

Thanks for info.
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