This is a Onan 40kw Power Generator Plant set model 40EF-4R/637B s/n#60C639534 , set up for dual fuel it has a switch to go from gasoline to natural gas and has a gas regulator in it . the ratings are based on gas fuel rated : continuous 40kw 50kva 138amps 120/208v 60Hz 3phase P.F. .8 Exciter # 102SX1N1B gen data 40EF4N1B RPM 1800 12 battery negative ground , powered by a V8 Ford engine s/n#10358-L9KM type B8PK-6005-A-S0-31 .
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