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2003 miniexcavator wont start

I have 2003 mini excavator 303.5 ccr,it start acting up, at first wont start o make a sound pn the starter i jumped cables and nothing,then i hit the starter a little and it work,days after did the same i try everything didn't work, took starter to be check is good, replace and moved wires around and nothing, change switch and nothing, move relays around and still nothing, someone the can give an advice what to do next.