85txaggie,
The 1st "failure" (
) is likely the root cause of the remaining 3 failures ( #2 ripped end of hydraulic ram, #3 broke lower boom pivot, #4 broke backhoe undercarriage frame ). To get that kind of bending force on the dipper, the operator probably hooked the bucket under the stump and then tried to drive the machine, in low gear, away from the stump and probably at a pretty severe angle. I have seen inexperienced operators hook a backhoe up the stump and then take running start to yank it out of the ground instead of digging it out. All of the various joints from the backhoe carriage frame mounts all the way out to bucket took a severe amount of abuse and the dipper to boom pivot was the first to give up the struggle. I suspect all the other subsequent failures were initiated at that time and failed as the machine continued to be worked. Most hydraulically operated machines have relief valves which prevent the king of forces neccessary to produce failures 2, 3, 4 and would have prevented #1 if the operator had been swinging the boom under hydraulic power to cause the failure. I am certain every contributor here has heard the high pitched squeel when the hydraulic overpressure valve kicks in because the load is higher than what the operator is asking the equipment to do.
While the LS equipment is not commercial grade it is most likely a capable machine so long as it is NOT abused. I have no direct experience with LS so I can not comment on machine quality or engineering.
Hope this helps.