I another 350 hp blower motor which has been running since 1991. No records in our system ever show any overhaul or motor removal. Thats basically 16 years of steady running.

How unusual is that, and what is the normal average life span of one of these motors in the blower application?

I've been getting an up trend of velocity reading on the motor the past few months, and I'm inclined to believe this needs to be pulled and overhauled. Bearings look decent.

I still running a gammit of test on this one as well.Phase readings will be next. This motor is also experiencing high axial vibration readings.

Thanks

Rockin' Rod

When properly maintained, the average motor should see 20 years of service life. When they do not survive this long, they are an expensive fuse for either poor maintenance practices or other motor system issues.

Howard