I have an SK250 LC that is 'bogging down' and blowing some black smoke even when lifting the boom and the bucket empty. Air filter is good. Its mainly slow on the lift cylinders and one of the travel motors-both related to one of the pumps. I have the workshop manual and have read the28 item check but it is very difficult to read the display monitor-the machine has over 16,000 hours on it. Anyone had a similar problem?
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