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sight glassBlocked/partially blocked vent in sight glass or bearing housing, small hole at top of sight glass must be clear for gauge to work correctly, see image

Air seals on bearing housings are dirty where shaft enters/exits the bearing housing

Oil ring not turning all the time

Dirt moving around inside of housing blocking oil to sight glass

All can cause oil level to fluctuate



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  • sight glass
Last edited by Registered Member

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