Question about Northstar Generator 9 Hp, 5500 Watt, Gasoline
I have a Northstar pro series 5500 with a 9hp Brirggs Vanguard. I was running a welding machine off the 220 outlet and it stopped putting out current. I removed the panel and checked all breakers and connection with no results. I then removed the generator cover and did not see any damage. It has a capaciter but I am not sure how to test it. I did check the coils for resistance but am not sure if I did it correctly. I also do not know where I can get replacement parts. Any help would be greatly appreciated.
SOURCE: Northstar 5500 9HP Generator
Ok, try and take the bowl off and clean it out with some carb cleaner. Also open the carb top and shoot carb cleaner down it for several seconds repeatedly. If it has never been used it still was started and tested at the factory. It has gunk build up on the nedle and is probably stuck. This happens to alot of carbs even sitting for only a few years. Just take the carb apart as much as you feel comfortable with and spray carb cleaner all through it. Move the movable parts alittle and then try it. It has to work . P.S. Look in the gas tank and see if there is any rust in it. If so you need to pour some deisel fuel in it and sloush it around and dump it.
Posted on Dec 19, 2008
There are a few scenarios that can cause this.
1) The extension cord that you are using is too long / too light of a guage. Try a heavier extension cord, or plug directly into the generator.
2) The alternator has lost its "residual magnetism" and may need to be reflashed. Consult Northstar for instructions and details.
3) The voltage regulator (actually a simple capacitor) may be "weak"
4) The diode for field winding may be bad.
You can get a copy of your manual here, page 40 has diagram and part numbers.
Posted on Aug 25, 2009
Hi Doug. Welcome to FixYa I am Kelly. Download this manual and use the applicable section for troubleshooting your Generator.
What concerns me is you said "there is no current anywhere."
This lead me to believe that given at the time of failure you had a light load on the unit that maybe something simple like a wire has vibrated off a connection somewhere.
Is this a brush type or inverter type generator? If it is a brush type one brush getting hot and moving away from the slip ring assy will cause the exact same symptom.
With the brush block installed you should read a low resistance across the brush block terminals.
If you remove the brush block and one brush is longer than the other one suspect the brush block as the cause.
If it is an inverter type generator there are two types one with an inverter electronics box and the other with one or 2 large capacitors. The one with the large capacitor if the condenser wire has come off or burned, the field will not flash. (Common issue)
There is also a 4 post diode block that must be functioning correctly to have a generator output. There is one terminal 90 deg out from the other three that is the positive terminal. It should read to all other posts in one direction and not at all in the other direction. (meter leads reversed)
This should be enough information for you to isloate the problem. If not just respond here and we can walk through troubleshooting your generator after you have the manual and have done some basic troubleshooting.
Thanks for choosing FixYa.
Posted on Jul 30, 2010
on the end of the rotor their is a Diode as well as a varistor these will go bad common in these units and cause a power loss these are attached to the rotor by a strip some like a pc board some a insulated tang to say remove the 2 one on each side Diode part# 778959 varistor part# 778961 manufacture numbers you should be able to go to any electronic store like radio shack and cross ref the numbers as to the diode i don't have the spec's but when you find it it will have the voltage rating get the next size up it is better to go to a higher voltage what the diode does it acts like a 1 way valve power flows one way and if their is a spike it wont allow it to come bach and damage parts before it it will also act like a fuse to sorts to much it will pop. the varistor varies the flow their sensitive and adjustable if purchased from other than manufactures factory it will need to be adjusted hope one is good and use a multi meter and test the Resistance and adjust the new one to that spec as close as you can at the end plate their is a capacitor part # 778958 replace this as well again go a higher volt rating but do not change the MF value with this said and done.your will have a more stable sign wave and beefier circuitry able to hold up better use lock tight on the screws for these.ther is not any control in the box with the plugs just breakers after replacing these parts and there is still no power then the stator is shorted and will need either re-winding or replaced.
hope this helps.
Posted on Sep 01, 2010
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