This is a PART (consumable fluid). Aftermarket hydro fluid; suits hydrostatic transmission and hydraulic drive applications where a 15W-50 grade is specified.

Jakmax 15W-50 Hydro Fluid is used for servicing hydrostatic transmissions and hydraulic drive systems found in many ride-on mowers and zero turn mowers. Fresh, correct-grade oil helps maintain smooth drive response and consistent performance, especially when equipment runs hot in summer or is used for longer mowing sessions.

Hydro systems rely on clean oil to lubricate internal components and support stable hydraulic pressure. Over time, oil can darken and lose effectiveness, particularly if the machine has been worked hard or the service interval has been stretched. Changing the hydro fluid as part of a proper service helps reduce wear and can improve drive feel compared to old, tired oil.

Always confirm the required oil grade and service procedure for your specific mower or transmission model, and replace filters if your system uses them.

Technical Specifications:
Oil Grade: 15W-50
Application: Hydrostatic transmissions and hydraulic drive systems