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Looking for some help on this…So we have a Kubota SVL90-2 with about 2300 hours on it that we have owned since new and has had all the scheduled maintenance performed on it . Showing no codes, plugged it in to check for codes and there are none. Machine runs fine until it is under a load (trying to load the bucket, carrying heavy load on the forks, trying to drive up a steep incline, etc) when its under by a load it produces black smoke, not thick, but enough that it has turned the exhaust pipe and the back of the machine black. We have replaced the air cleaners, changed the fuel filters, and found no blockages in the air intake, we have also checked the turbo, no excessive oil or loose. Anyone come across this before? Any help would be appreciated.