Coleman generator OHV3000

check that you have the governor control rod on the butterfly lever of the carby connected correctly
it appears that the lever is at full throttle when you connected it and so the governor cannot pull it back to correct speed
if correct the throttle will be at full speed when stopped but will move with the go lever to slow when you manually push the gov lever

It sounds like the governor arms internally are broken, can you feel any resistnce? if not then it will need a tear down to fix

With parts list in hand, look at reference #21 governor arm and reference 89/90 adjustment screw. This adjustment will increase decrease engine speed. I would use a meter with hz setting to set engine speed to achieve 60 cycles. Sixty cycles on the meter would indicate that the engine is turning 3600 rpm which is max. If all working correctly, voltage should be around 120v at 3600 rpm and 60 cycles. Good luck

Make sure the governor is working properly. When you put a load on it the engine should increase in speed slightly. Make sure the engine is running at the correct speed 3600 rpm. Try plugging in an item that draws less power such as a electric drill and see how the generator behaves. Also make sure the engine runs smooth while not under any load. Check the voltage from the outlet to make sure it is putting out 132 volts not under load.

Take a close look at the governor and its associated springs. There should not be any play in the governor arm, springs should be taught when engine is off.

The governor spool may also be binding, but much harder to check since it is internal to the engine.

Start the generator, and watch the governor arm. When RPMs drop, you should see the arm move in an effort to open the throttle. Conversely, when the engine races, you should see the arm move in the opposite direction to try and close the throttle. Small movements of the governor are normal with a steady load. If you don't see the governor trying to correct engine speed, you likely just identified the culprit.

Check your air filter to make sure it is clean, especially if the gen. has been run in dirty, dusty conditions. Make sure the gas tank vent is not clogged.

Also, pour some combustion cleaner into the carb. through the air intake to clean the carb. It sounds like it is starving for gas.

Hope this helps.
Rob

A friend of mine had one of these units, it was doing the same thing. Opened it up and found one of the two field diodes bad. Went ahead and replaced both, about 3.50 ea. Full power under load now

Your RPM's are too high. There is no voltage regulator in coleman generators (generator is actually made by generac) and is 100% dependent on engine speed. There is a screw under the tank when your looking in from the recoil side. It controls the governor arm. Screw it in and it incresses the rpm, out decrease. Plug something in that draws a decent load while setting the rpms since you want it to put out 120 and 240 underload. Your idle voltage does not matter.

Hi,
The engine should run at 3750 rpm at no load. If that's OK then you may need to troubleshoot the capacitor inside the end of the generator opposite the rope. Since the thing has been stored for some time you may just need to flash the field of the generator to restore the residual magnetism in the rotor. The easiest way to do this is thru the 110 outlet but it's a little dangerous. Plug an old lamp cord into the outlet, start the generator, and momentarily connect a 9 volt dry cell to the wires, then shut the generator down and see if there is 110 when you restart it.
Regards,
Carl