Hy-Gard and low-viscosity Hy-Gard transmission and hydraulic oils are unique oils developed by John Deere engineers to meet the exact needs of John Deere machines. Both Hy-Gard fluids are multi-viscosity fluids with high-viscosity index. Low-Viscosity Hy-Gard has an ISO 32 viscosity grade. Hy-Gard viscosity places it between ISO 46 and 68 grades. Both Hy-Gard fluids are multi-viscosity fluids with high-viscosity index. Low-Viscosity Hy-Gard has an ISO 32 viscosity grade. Hy-Gard viscosity places it between ISO 46 and 68 grades. Hy-Gard may be used in many applications specifying either of these grades. Low-Viscosity Hy-Gard has the same performance specifications as Hy-Gard and can be used as a replacement for Hy-Gard in cold weather. Applications · The exclusive Hy-Gard formula was designed for use in John Deere equipment; however, it can also be used in many non-John Deere transmission and hydraulic systems. · Low-Viscosity Hy-Gard is used for factory fill in many machines. Consult the machine’s operator’s manual to determine what machines require low-viscosity Hy-Gard. It also is used as a replacement for Hy-Gard in cold weather applications. · Low-Viscosity Hy-Gard replaces the John Deere All-Weather Hydrostatic Fluid and should be used as a direct replacement for all applications recommending hydrostatic fluid. · Low-Viscosity Hy-Gard is compatible with hydrostatic fluid and can be added to systems, which contain hydrostatic fluid. Features and benefits · Performance-tested both in lab and in field and approved by John Deere engineers to meet increased demands for performance and protection of transmissions and hydraulic oils. · A polymeric viscosity improver helps Hy-Gard retain its proper viscosity over a wide range of operating temperatures. For Hy-Gard to work efficiently, it must flow readily through any part of the system. Oil that is too light can cause increased wear; too heavy will cause sluggish operation and lower mechanical efficiency. · Reduces wet-brake chatter, assures high braking capacity. · Superior wet-clutch performance smoothes clutch operation. · High tolerance to water contamination without sludge formation, which could cause filter clogging and hydraulic system malfunction –anti-oxidation capability allows oil to work properly at high temperatures, helping keep transmissions and hydraulic system moving parts clean. · Provides protection against rust and corrosion, particularly during low-use periods. · Anti-wear additives keep gear and bearing wear to a minimum – extreme pressure film in Hy-Gard helps prevent metal-to-metal contact. Functions Because transmission and hydraulic oil must perform many different tasks at the same time, there is very little margin for error. To understand the complexity of transmission/hydraulic oil, let’s review its functions:

• Prevents wear of high-torque, heavy-loaded gears and bearings.
• Provides wear and corrosion protection for hydraulic pump.
• Provides proper friction for wet brakes to give maximum stopping performance with minimum chatter.
• Provides proper friction for clutches to engage and absorb shock loads without excessive slipping or abrupt shifts.
• Provides proper friction for brakes to ensure low chatter, long life, and high capacity.
• Withstands extreme pressures in hydraulic system without breaking down.
• Prevents the formation of deposits on all internal parts.
• Prevents foam and water damage to all internal parts.
• Hy-Gard oil can be used in most applications calling for 10W-30 or 5W-30 engine oil for transmission and hydraulic oils. Note: Hy-Gard should be used in all applications calling for JDM J20C.
• Low-Viscosity Hy-Gard should be used in all applications calling for JDM J20D. Low-Viscosity Hy-Gard and Hy-Gard are compatible with hydrostatic oil and can be added to systems that contain hydrostatic oil.