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Message: <blockquote data-quote="contractor bill" data-source="post: 49390" data-attributes="member: 6606"><p>My construction company owns a Komatsu SK820 turbo 2 speed utility skid-steer. The bucket is controlled by foot pedals. We've had the machine for about a year. Last week my operator told me about a problem he was having with the machine. While he was excavating dry dirt from a ditch and moving it about 20 feet away he noticed an operator working a backhoe fall out of his machine. My operator immediately tried to help him out. He unbuckled his seat belt, raised the arm bar and by mistake stepped on the left foot pedal. The left pedal controls the up and down movement of the bucket. Almost immediately the bucket dropped. Afterwards my operator told me that the bucket should not have dropped if all the safety devices worked on the Komatsu. I believe that there is a seat sensor and an arm bar sensor that if activated is supposed to shut the system down and even if the pedal is depressed the bucket should not move. In our case the bucket did move downward and it could have been fatal to my operator. Can anyone tell me how the safety sensors and safety interlocks work in the Komatsu? Could the machine have a faulty hydraulic or spool valve? Could the small circuit board (in back of the seat) be malfunctioning? Please help.</p></blockquote><p></p>