Transmissions on the consumer zero turns and tractors are maintenance free. Consumer zero turns and tractors do not require regular fluid change unless regular service is notated in the owners manual.
Swedish Riders 16 (H), RIder 155, and Rider 175 use 10w-30 non-synthetic engine oil. Rider 175 AWD and Rider 155 AWD use 10w-40 non-synthetic engine oil.
NOTE: Fluid change for the Swedish Riders needs to be performed by an authorized Husqvarna Service dealer due to the complexities of the drive system.
Below are the common models that require drive fluid changes as part of the listed maintenance schedule.
EZ, MZ, and earlier ZTH commercial zero turn mowers use 20w-50 non-synthetic engine oil. The fluid capacities are listed in the owner manual.
iZ, LZ, BZ mowers use 15w-50 synthetic engine oil, capacities are listed in the owners manual.
If you are experiencing fluid loss or loss of drive, the mower needs to be taken to an authoirzed service dealer for evaluation and repair.