Electric motor? Belt drive to compressor? If so, remove the belt and see
how the compressor feels by hand, and whether the motor now apparently
runs properly. Has it been unused for a long time? Have you checked the oil?
Could be motor capacitor or brushes (if it has them). Could be failed
bearings in either bit, or rusty piston rings in compressor.
As others have suggests, check the motor runs without the load of the
I'd look for the compressor having corroded if it does, especially if it
hasn't been used much an stored in a damp garage etc. A bit of a 'clean'
and all should be OK.
At worst, salvage the tank and control gear and marry them all to an old
fridge/freezer compressor (change the oil ideally). The work
surprisingly well with a decent sized tank and are much quieter than a
'normal' compressor. For casual use, they seem great.
(I invested in a Clarke one before I saw a 'converted' one in action,
I've been kicking myself ever since- it only gets used a few times per
Assuming things are free to rotate by hand with power off it's usually
the motor start capacitor. Not terribly expensive to replace, any one
of the same characteristics (as printed on it) will suffice.
Doesn't spound right to me. The starter cap is tehre to start it, and
once running really plays no part.
And I wuldnt have thought that this would be a synchronous maotor
anyway. I'd have guessed a universal, in which case try brushes and if
they are not the problem,. buy a new compressor as rewinding motors aint
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