I service and maintain a high profile contract and I need some advise, guidance and assistance.
I have (4) 2500 and (2) 1250 ton York YD's on site. I have been maintaining these guys for three years. I have encountered a fair amount of problems that I have been able to review the manuals and work out ok but last year I had a VGD shaft bind up. It was an easy enough fix with a new shaft and related "o" rings. Towards the end of last season I had a PRV shaft bind in another unit. It will be an easy fix as well after I remove 6,000 lbs of 134a as the same basic engineering went into both devices as related to there shaft to housing design.
My question is are we seeing this happen as a result of poor internal lubrication? Oil is always at approx 120 degrees and 35psi by variable oil drive speed and seals lubed at 24 hr intervals per processor when standing by. Not sure tonight of exact hrs but units are 5 yrs old and maybe 30,000 hrs. Anybody else noticing similar problems? Any York upgrades know for fix? All feedback welcome, thanks