Mr John it is a 2 stage. The bottom rollers on the inside track are the ones that need changing. I have removed the attachment and the carriage.I have also disconnected the chains and chain wheels along with the hydraulic hoses. Seems like i need to jack up the lift so the inside track can come down further than the outside track. I have no jacks or ramps though. I thought of removing the battery and using my Toyota 4 pallet to lift it up but that seems a bit dangerous. Any help would be appreciated sir!