How to operate portable generator Mastercraft M-750

They have model numbers and that is needed to search. '4600' is a wattage output not a model number, and are you sure it is 4600 and not 4500?

https://www.google.com/search?q=manual+for+Coleman+Powermate+4600+generator

There is no 4600

https://www.powermate.com/search/?text=4600

4500 manuals

Powermate PM3800, PM4400E, PM4500 Portable Generator

https://www.electricgeneratorsdirect.com > manuals
PDF
This manual contains important instructions that must be followed during placement, operation, and maintenance of the unit and its components. Always supply ...
84 pages

Powermate Portable Generator User Manuals Download

https://www.manualslib.com > ... > Powermate Manuals
Download 246 Powermate Portable Generator PDF manuals. User manuals, Powermate Portable Generator Operating guides and Service manuals. ..

try manufacturer site or online search using make and model

Free English owner's manual online from Sears. See the manual menu choice below:

http://www.sears.com/pulsar-7500w-gas-6000w-lp-dual-fuel-portable-generator/p-07172276000P

Google from manual lib

https://www.briggsandstratton.com/us/en/generators/portable-generators/products/5500-watt-portable-generator-us

Usually the cause of slightly low voltage like this is that the engine is not running at full operating RPM. Find the high speed adjusting screw on the govenor linkage and adjust the engine RPM until the output is 220V - 240V

Is there voltage on generator terminals. If not you must recharge the field or check the Voltage Regulator output

You have to have a multimeter and know how to use the ohms scale. Some meters actually have a diode test setting. Do you have a meter? I'd be glad to work you through it...

If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c