Running 60 Hz Motor On 50 Hz Supply

I live in Ireland and I imported a 4 post car lift from the USA.
The motor that drives the hydraulic lift pump has 208 - 230 v on the plate . (220 supply in Ireland )
However when I began to operate the motor when setting up the lift I noticed it was getting very warm .
I asked an electrician to check it for me and he discovered it was drawing 45/46 amps - the plate on the motor said 15.0 -18.0 amps . The rpm on the plate was 3450 .
He had come across this before and figured that while the motor was 60 Hz on the plate the supply was 50Hz - and the maximum achievable revs at 50 Hz was approx 2900 .
For this reason the centrifugal switch was not disconnecting the start up capacitor - causing the high current draw and the heat .
The suppliers have not been able to offer any help - even though they say they supply lifts worldwide and should have encountered this problem elsewhere .
The electrician says he can get around the switching problem by mounting an external electronic timer to disconnect the start up capacitor as he has done this successfully before .
What he's not sure about and would like advice on is :
would there still be a tendency for the motor to overheat due to the Hz difference ?
I operated it a few times before I became aware of the problem - but only for 30 secs or so and it was then drawing 45/46 amps . Would it then be safe to assume that it would operate OK if the start up cap was disconnected as intended ?
I note from the FAQ that there would be a 20% drop in rpm - I am hoping this would not make too much of a difference to the speed of operation .
I don't want to fit electronic timer etc if there is a strong possibility that the motor will still overheat .