5/3/2016 5:05 AM
On the 1880 remove the lines and plug them on the center cylinder and raise units see if they drop, if so re-hook and proceed to the rear units until you find the one where they stay up. In most cases it's a bad seal within one of the lift cylinders. The front wings and the center and two rears are on two separate circuits.
On the topdresser looking at your drive roller and make sure its spinning and then look at the conveyor belt and see how fast its moving. It may need adjusting. Also the pump belt may need replacing even though it has an auto-tensioner, it will wear and stretch on you needing to be replaced.
Those are the areas where I would start first, and are the most common and easiest to check.
regards,