The hydraulic oil for the Hydro Gear Transmission 2800, 3100 or 5400 should be changed after the first 75 hours of use, then every 400 hours after that. However, the oil can be changed at any time, especially if the performance of the hydrostatic drive is reduced.
Note that the hydraulic filter needs to be changed at the same time (if equipped).
Please see the table below to identify the correct oil and filter to use with your model.
*Approximate Oil Needed is for Complete Drive System, not individual Pumps.
*Please see the owner's manual for your unit to identify the correct filter.