Montgomery Ward compressor blows 20 amp breaker
Montgomery Ward 1 hp compressor
I have an old Montgomery Ward 13 gallon compressor with a 1 hp motor. The breaker blows as the peak pressure is being reached sometimes. A clamp on ammeter shows the motor pulling 19 -20 amps from no pressure start up to almost 30 amps just before the breaker blows. Cap is OK. With belt off, the motor pulls 12 amps running under no load. The motor decal says it should draw 17.8 amps starting and 8.9 amps running. The compressor seems hard to turn by hand about every other revolution of the drive wheel. Any ideas on what the compressor pump is doing that could cause this?