hi mate the problem you have is that these types of machines are well past their used by date( i think most things have a build design life of 25/30 years) but bc of the good build quality and the expertise of the elevator mechanics we keep these lifts going. unfortunately there comes a time when machinery just need to be replaced. if you went down the road of a mechanical overhaul (crown wheels,worm gear, bearings, ropes etc) normally what happens then something else needs to be repaired and parts req generally need to be made up it comes to a point of cost prohibitive when compared to modernisation considering parts and labour knowledge are freely available.
i dont envy your situation.
