Vacuum
Motor
Excessive
Won’t
Possible Reason
Low
High
Overheating
Overload
Noise
Start
Dirty Filter
X
at pump
X
X
X
Dirty Muffler
X
X
X
Plugged Vacuum Line
X
at pump
X
X
Vanes Sticking
X
X
Running at Too High RPM
X
X
X
X
Rings / Vanes Worn
X
X
Shaft Seal Worn (Replace)
X
Particulate Material in Pump
X
X
X
X
Motor Not Wired Correctly
X
X
X
Damaged / Dirty Valves
X
X
Improper Cylinder Alignment
X
X
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