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MopaRV's avatar
MopaRV
Explorer
Apr 08, 2022

Onan Microlite 4000 shaft locks up on occasion

I have an Onan Microlite 4000 generator and the shaft locked up when I powered off. This is a new issue and it runs fine otherwise. Oil level is fine. I broke the shaft free with a wrench on th...
bounder39zman's avatar
bounder39zman
Explorer II
Apr 30, 2022
The problem as described by initial poster is caused by starter drive. Onan tech for 35 years+. Have fixed this issue literally dozens of times. have worked on hundreds of Microlite/Microquite gensets, and seen engines lock up due to broken con. rods, crankshafts, balance shafts, camshafts, dropped valves, seized rotor bearings, etc. However, since it can be freed up by jerking on flywheel/blower wheel, and then seems to run ok, would bet the farm on being a starter drive problem.

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