My converted Masterwood Speedy 207 has a 1.1 kW dry rotary vane vacuum pump.

The machine is practically brand new, even though it was built in 1999...long story. The pump probably has about 6 hours of operating time.

I was running my first longer program, and after about 15 mins the pump suddenly got twice as loud, it's normally very quiet. I (stupidly) let it run another 5 minutes hoping to finish the program but the 6A breaker tripped.

I found 2 damaged vanes (see photos). I turned the motor manually and ran it without vanes and there is a squeak like a dry rubber seal. Otherwise the motor seems OK.

Questions:
1) What caused the vanes to be damaged? The motor did run backwards a couple times due to wiring the phases backward.

2) Should I try to quiet the seal with lubricant or just let it break in?

3) What caused the motor to draw enough current to trip the breaker?