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Provided it still has the orginal engine here is the service manual for the Onan Engines P48G and the P220G. Starter info start on PDF page 185 (manual page 60-1)
Find the physical specs by googling the engine. once you know the requirements for shaft size and length and mounting holes you can check the other engine manufacturer's site for compatible engines. then go look on ebay for folks selling those engines.
318's are known to have flywheel problems and poor engagement of the starter due to incorrect alignment of the starter to the ring gear.To check either of these things you need to take the motor out of the tractor to look at the ring gear,starter drive and starter aliggnment.Before you go through this pain replace the ignition switch or have it tested.p.s deere only supplies a replacement flywheel but a ring gear can be ordered through a case dealer if you get it for a stinner with the onan engine.
Your Onan engine will do excellent with Mobil One 0w40, Mobile One 5w30.
DO NOT use hydraulic oil in the transmission/transaxle, you will destroy it. Your tractor uses an Eaton 11 Hydrostatic transmission pump with the oil resevour being the cast iron transaxle. The WheelHorse transaxle is as rugged as they come. It uses a solid cast iron housing, case hardened intermediate gears and forged differential gears with an eight pinion differential.
Your transaxle requires 10w40 synthetic or conventional oil as well as a wix 51410 filter or the OEM wheelHorse filter. It should be changed every 100 hours with conventional oil or 250 hours with synthetic. DO NOT use hydraulic oil!
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