Rollers Carriage Carriage Rollers Boom Tele-boom Boom Mountings Boom Cylinder Mountings Stabkzer Casting 8. Casings, Undercarriage, Idlers, Track Adjusters, Running Gear Bearings Shaft Thrust Washers Seals Input Seals (nternal failure) Front biers toter Shafts Track Aciuster Assembly Tension Sp