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.