Clarke compressor problem

[vmax1974]

I have a clarke ranger 46 and the other day it just stopped working I found it had tripped its on board breaker so reset it and it tripped again without turning over so at first I thought maybe it had seized so took the cover off and turned it by hand and no problems turned over easy enough now I seem to be stuck with a compressor that wont compress not sure how to check the motor and/or capacitor as I am not electricly minded anyone got any suggestions

Thanks