Roots blower
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The bearing is seized; the synchronizing gears are straight-toothed, and it’s not possible to fix this
Synchronous gears are hard to remove; it’s quite troublesome anyway. Make a jig and use a jack to lift it.
It seems to be due to the bearings not having been replaced for many years; it is necessary to keep track of the maintenance schedule and improve oil lubrication.
Special tools are necessary; use a jack to lift it.
It’s like having crooked teeth; regular maintenance is needed
This fan can no longer be used; the wear marks on its two impellers have changed, and its dynamic balance has also been affected. You can check the runout of the shaft. Replace it with a multi-stage centrifugal fan.