Coleman Electrical Supplies - Page 3 - Recent Questions, Troubleshooting & Support

This is old but for anyone reading it now, first thing to check is your engine. If it isn't getting up to full rpm the generator won't make power.

carb possible float valve stuck causing flooding --clean rebuild or replace carb

I don't think there is any way to tighten or repair leak other then by replacing grommet. sorry I'm not much help but coleman powermate is no longer in business and I have had no sucess in finding a source for parts for you.Thank you and good luck.

A gas cap that works for 1850 generator is a homelite DA 06486.

Powermate generators usually have a shutoff mounted to the bottom of the fuel tank. There is a knob at the bottom of the connector where the hose is .

clean--rebuild or replace carb

https://www.google.com/search?q=coleman+powermate+3750+spark+plug+replacement Amazon or eBay.

Request the manual from Coleman.

Talk to Jack https://www.jackssmallengines.com/jacks-parts-lookup/manufacturer/powermate ..

Check test breakers/resets -- and check out put for power possible open winding or short

Google it. That is what I would do.

bad magneto or alternator

contact manufacturer tech support they will send you a PDF file

Hello, Allan - If you haven't already thought of calling the Coleman Consumer Service number, I recommend you call them to learn if the company can provide a service manual for your model generator: Call 1-800-835-3278 Monday - Friday: 8:00am - 5:00pm, Central Time Another option is to check with your local public library (maybe the main/headquarters branch) to find out if they hold a service manual for your model of Coleman generator. These days, many public libraries subscribe to electronic databases of all kinds of repair/service manuals for motorized products. Plus, access to the proper database can probably be done from home, through the library home page. Note: You will need a valid library borrower card. If you don't know the number of your local public library to call, use your favorite search engine and this kind of search strategy: "location name, state" "public library". Use the quotation marks as shown. Example: "Beavercreek, Ohio" "public library." If you call the public library, ask to speak with a reference/information librarian. Note: Your public tax dollars at work!

it doesnt have a dipstick and its that yellow cap. you fill oil to the edge of that after you remove the cap.

you might be able to get parts from coleman

If it is a self energising rotor, the only way to test them in the field is to test everything else and assume the rotor is defective if the other stuff is ok, fortunately the self energising type are few. There are a number of testing methods for the conventional rotor and the best way is to use an armature type tester that makes the rotor or armature the secondary winding of a mains transformer and a voltage will be measured across the slip rings. In the workshop there is the visual inspection - does it look ok? Are the slip rings worn, has it been getting hot, are the shiny bits changing colour and does it smell burned... Check for winding continuity with an ohmmeter. The actual resistance will vary depending on model and output - great if you have the data for your machine and there is plenty of information online about how to calculate what it should be but I would be content to find continuity but not a short circuit and a resistance perhaps of 10 - 25 ohms and then the insulation test - I would use my hand cranked 500 volt Megger between a slip ring and the shaft/other metalwork. In the absence of a high voltage insulation tester (dedicated professional gear goes much higher than 500v) General motors recommend using mains voltage (carefully). The hot mains wire goes to the 220 volt light bulb and one insulated probe comes from the bulb and the other probe is the neutral... The rotor should have a small amount of residual magnetism so running the generator with the brush gear disconnected there should be a few volts generated in the stator - this is usually fed into the rotor via the brushes and the exciter and starts the circular generating process until a peak is reached that is limited either by the rotor speed or a voltage regulator.

Most likely it needs the battery to do that itself.

If it has sat unused, could be water (condensate). Drain fuel tank and replace with fresh fuel. Be sure to drain carburetor fuel bowl.