since all 4 lift have the same fault then it cant be a stall situation. i would also agree that the duty cycle needs to be looked at as remeber they only have a certain amount of starts per hour and heating the oil v cooling of oil is not linear. it takes alot longer to cool than heat. so i would look at-
add oil to the highest level you can to the tank.
check the duty cycle of the building and assess wether it has changed.
add more time to door dwell for a longer time between travel of the lift.
if all else fails and/or you are unable to change anything the only real solution is an oil cooler. ive installed these coolers to hydro's on my round where lifts were constantly going out of service to zero call backs. they arent cheap but you need to sell the idea to the customer what would you prefer? o-o-o lifts or lifts that work.
Last edited by uppo72; 04/21/12 01:32 AM.
