ive had my 2 ton Craftsman floor jack for over 15 yrs. an she still works to this day with NP's.
now there Bike lifts have the life expectancy of 1 minute wuth a operator that dont know what to do ...they seem to suffer the same problem Bob has .
They work like a champ until an usespectin user pushes the lowering pedal to the full extent and the Jack will blow out every time and render the unit worthless i warranteed a few of them still under 1 yr ...but the ones that were older it was cheaper to replace them than to get a new jack for them.
now on my floor jack you only ever twist the handle a 1/4 turn to lower a vehicle at most so it has never seen a full out depression.