BM, if you are having commutator problems it would mean your whole armature needs replacing. you can get a good result from this repair however probably very costly. the thing is you have to make the decision on whether you think other than the generator the lifts have been pretty reliable. its all about projecting when and if the lift failures become so prevelant that you have to constantly repair them and this means costs and down time. chicken or the egg scenario. if you modernise the lifts you know you will have the spares close by and for a reasonable long time but you cant know this regarding the old existing lifts.
We're now talking about a complete armature replacement as part of a generator rebuild. But we are still probably looking at a complete "modernization" at some point over the next couple of years.
Thanks,
BM
