i would say make sure to have up to date backup for each robot, maintain robot and controller per manuals, don't let things escalate to a point of failure. this means keeping things clean, regular (and correct) work or replacement of wear and tear items (robot oil, batteries, counterbalance, energy supply, fans).
optimizing programs for less frequent stops and less violent acceleration/jerk etc. and for gods sake make sure to tighten all strain reliefs, cable glands, buttons etc. plus one thing everyone forgets - maintenance of proper documentation. people walk on or throw away valuables like CDs, schematics etc. recovery sticks become expensive and no longer functional souvenirs...
i was amazed how many people would complain about lack of documentation or support the moment i arrive... and when i open cabinet i see shoe prints, scratches and all kinds of stains and damage to CDs and schematics. guess where my sympathy levels are after seeing that.
got called once to fix robot that did not work any more. robot was on pedestal, and base was covered with rugs drenched in oil and impregnated with sharp metal chips. and the operator was trying to squeeze past robot to recover dropped part. in process pulled on those rugs and disengaged X30 connector. such nice place to start fire....
Thanks. I got it. About data backup,we did regular program backup every 2 months and system image file. Oil change and counterbalance check are the part of annual maintenance project. As for clean, I can't ensure all of it, the cabinet seems ok,but robot arms is bad,especially the gear box of A3 which is dusty on the surface,the workers can't clean it with dry rag. I'LL make some strategies to handle it.
Optimizing program is important, but I didn't care much about the motions.the speed of most program is 100%,even at A4 huge angle change,maybe I should look over all the robots.
About Docs,I usually find it in accessory USB and the related OPTION DOC file. but I still do not have KUKA PARTS & DOCS,I can't find the CDs.
I'll notice all of you said,thank you