Question about Coleman Powermate Powermate 5000W Generator

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I have a UST GG5500 Generator practically new will not start

Only has about 30 hours on it, full of gas and oil. Checked plug disconnected low oil sensor wire and nothing. All I can figure is bad Carburetor Assy....but have no idea where to find this part. Called number on manual and the phone just rings...Any suggestions or know where I can order this part.

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  • allen kmiecik Dec 27, 2012

    my gg5500 will not start after sitting all summer. I put new gas in it, tried the tilt switch suggestion, sprayed starter fluid in the carb, checked the spark with plug out to find a very weak looking spark any ideas on the weak spark?

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Hi, carburetor can be found at amazon, click here and take a look: Portable Generators from Briggs Stratton. I hope this was helpful. Cheers

Posted on Dec 21, 2014

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I had the same problem with this generator. I tried all of the usual suspects: fuel level; fuel valve; oil level; air clearner, spark pluge etc. The problem is a "tilt" saftey shutoff --I was using the generator on a pea gravel patio and it settled about 2" out of level... The tilt switch is not mentioned in the manual and it apparently does not reset itself once the generator is leveled.

To reset the switch, ensure that the generator is on level and stable ground, the find yellow wire that goes from a switch on the front side of the engine crankcase to the bundled wiring harness behind the panel. Disconnect the yellow wire at the in-line quick-connect coupler, which can be found by following the yellow wire from the switch on the crankcase toward the wiring harness. Once disconnected, start the generator as normal. The engine should start right up. Let the engine run for a minute, then kill the engine and reconnect the yellow tilt-switch wire and try to restart. I had to go through the disconnect-start-reconnect process twice before it reset, so if it wont restart after you reconnect the wire, disconnect it agian and let the engine run a few more minutes.

I hope this sovles your problem.

Posted on Mar 05, 2009

  • gunkulator Nov 06, 2011

    The tilt safety shutoff was the problem for me. I had tried everything else: new spark plug, new gas, topped off the oil, air cleaner. I even squirted some gas directly into the cylinder - nothing. Disconnected the yellow wire and it started after only a couple more pulls. You'd think something that important would be in the manual!

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My GG5500 sat over the summer and had been used after it was purchased during poer outage, so I knew it worked once. I performed the maintenance when not using for extended period of time. I was getting it ready for use this winter and when I pulled the rope it woulod backfire every couple of pulls, but not on regular intervals. I changed the sparkplug and the gas just for extra measures, but it still would not start and still backfired only. I have a car mechanic buddy that went straight to the cylinder head cover and removed it. He loosened one of the rocker arm bolts reassembled and it fired right up. He made another minor adjustment to the rocker arm bolt and everything was set. This is probably not the problem you are/were having, but I wanted to mention it just in case this happens to anyone in the future.

Posted on Dec 04, 2009

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When you look at the generator where all the switches and guages are there is a sheetmetal cover plate remove this plate and under it is all the wiring andcapacitors, there are two capacitors one on the far left and one on the far right. I think the far left capacitor is part of the ignition the one on the right is how the generator makes electricity, Check the capacitor to see if it is good

Posted on Dec 25, 2009

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Hi there,
You don't say if you've confirmed that you have spark. Try this:
Remove the air cleaner, make sure the choke is open.
Spray a bit of either carb cleaner, ether, or brake cleaner into the intake.
Make sure the switch is on and pull the rope, If you've got a bad carb you'll hear some sort of attempt to start when the spark plug ignites the stuff you sprayed in, otherwise you've got ignition problems.

Regards,
Carl

Posted on Feb 23, 2009

  • John Pouncy Aug 27, 2011

    I have a coleman powermate 5500. PMO645500. My carb is bad only after 20 hours, cant find a replacement !!!!!! Im totaly frustrated. Can anyone help us !

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If the tilt switch solution doesn't help (and I hope it does!), there are carbs available for this engine. First, however, try directly priming the engine with gasoline. (Remove the spark plug and use something to get a small amount of fuel into the cylinder.) Replace spark plug and try to start. If it fires and runs only a couple of seconds, it's burning the gas that you put in the cylinder and that's all. None is coming in through the carb. If it doesn't start, it's more likely an electrical problem (which could be a sensor grounding the system, as with a tilt switch would do).

If you need a carb, run a Google search on "UST GG500 carb" and you'll find a place that sells them for $24.

BTW, I've always gotten ahold of them and they've been somewhat helpful. 866-797-2738. M-F, 0700-1530 PST.

Sam

Posted on May 11, 2009

  • tphilip60
    tphilip60 Nov 03, 2012

    where did u find it for $24??

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Mine did the same, exact thing. I used it once and would not start. For whatever reason, the thing has been working fine for 4 years now - but I have to pop the plastic cover off the carb area and prime the thing (I use a little syringe to shoot gas in horizontally) every time it needs to be started (unless it's hot). if I don't prime it, it will not start - period. But it's been very reliable, otherwise.

Posted on Jul 09, 2016

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Yellow wire. Thanks for the tip.
Tried placing spark plug with wire onto a screwdriver, it sparked. Tried fule in spark plug hole. It went ? 10 seconds. Wont stay running. Dont have a hard copy manual. An didnt know of yellow wire, so I will try that before I decide to take it to a shop. Got it second, first guy ran it one day for power, couldnt pull the cord sold it to me an an ive tried most things I could think of myself. Only got 15 seconds once few months back. Ive struggled, an it has to be minor. Its hardly ever ran an not been full of fuel going bad, everything seems in order. Attempt to get back to report on yellow wire later thanks again

Posted on Aug 03, 2015

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The contact number for parts and service is 1-866-797-2738.

The manual with parts is here: http://www.searspartsdirect.com/partsdirect/user-manuals/GG5500-UST-GENERATOR-manual
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Not knowing your model # and how old your generator really is - as related to TOTAL RUN HOURS - I can only give you several possibilities of what the problem might be even though I don't know the make & model and what the rated WATTAGE output is.

I also don't know what LOAD you are putting on the Genset or at what RPM you are running the engine at as to half throttle or full throttle setting?? I take it that it's a Briggs & Stratton 4-stroke single cyl, or is it a Honda 4-stroke single/twin cyl engine?

Since it runs good for 30 mins, and then starts to cut out - I doubt that the OIL is a problem even though you ran straight 30 weight - seeings most small engines run 10-30 weight oil as a rule.

I seriously doubt you did any damage to the engine at all unless it was ran low on oil - in which case it should have a LOW OIL cutoff switch mounted in the lower engine case close to the CHECK OIL port.

If the LOW OIL switch is working properly and adjusted properly then you shouldn't be getting cutout unless this switch is mis-adjusted. (ie: mechanically set too low as then when the oil level is indeed at it's proper level the switch would be already shorting out to ground) (See your operators manual for proper setting)

A way to check for proper operation is to temporarily disconnect the (usually) BLACK wire from the LOW OIL switch when the engine starts to cut out. If the problem goes away completely then the LOW OIL switch is either mis-adjusted or else it is going bad from vibration. (Again see your operators manual for proper adjustment and/or check out procedure)

Electronically this LOW OIL switch should be the only thing that would protect the engine from damage should the oil level fall below recommended level. Other then that it may have an electronic REV LIMITER if it's a bigger and more expensive model, but usually not.

I doubt the Maintenance-free Magnetron® electronic ignition is at fault, but could be weak and going bad. Always a possibility, but I would 1st rule out everything else first. Since the Genset runs for 30 mins and then starts to cut out I would look more for like a fuel vapor lock (partially closed or clogged gas cap vent), a possible dirty fuel filter, possible water moisture in the gas tank or in the carb bowl, possibly dirty carb in general along with it's dirty Float Bowl, Float Pin, Float and Needle Valve, and any Adjustment Screws that go Into the Carb Body. That covers everything from a fuel standpoint.

You do know that all Gensets should be started and run for at least 10 mins every 30 days - right? If you didn't know this - now you do! Every good operators manual should state this.

It just doesn't sound like it's starving for gas unless it's building up a (vacuum) or vapor lock in the gas tank.

Having covered everything from an Electronics/electrical standpoint engine wise - there is only one other thing left Genset wise.

What it really sounds like to me (and I personally HAVE SEEN this happen myself firsthand) is that the generator brushes are nearly shot - as in almost worn out. They may be getting too too hot - as from excessive current draw at point of contact, and thus the generator sensing circuitry itself is doing an electrical CUTOUT!!

An added protective Genset circuit feature in that the generator itself may indeed be linked to the engine as a type of REV LIMITER on the Maintenance-free Magnetron® electronic ignition. Again - your operators or service manual should have a pretty good troubleshooting section in it unless you don't have that anymore or never got one if you bought it used to begin with.

It has to be one of the scenarios listed above.

Please post me a reply as to the found problem there, and the resolve to it by following my recommendations above. Also please rate my troubleshooting fix as well.

Best regards and thanks,

Frank

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