After running it for the past 4 years I can say. What a disappointment. Swing motor after swing motor after swing motor. P.O.S. Rattle rattle rattle. Komatsu shit.
When new swing rpm was 4 rpm. Was loading 250-275 240 ton loads in 12 hour shift. After 12 swing motor replacements, komatsu reduced swing rpm to 2 3/4 rpm. The cab rattles so bad you can’t keep from getting a migraine each shift. Our pc4000’s are even worse. The pc shovels went to shit in 2012. Prior to that they were fairly smooth to operate. Now complete junk. They constantly over heating, hydraulics. The swing motors hammer so bad they are shaking the entire shovel apart. Junk.
