Polaris Sportsman 850 2021 Owner's Manual page 107

FRONT GEARCASE (DEMAND DRIVE) FLUID
Always check and change the demand drive fluid at the intervals outlined in the
Periodic Maintenance Chart.
Change the front gearcase fluid every 25 hours if the ADC unit is exposed to
extreme use. Extreme use includes any of the following:
• operation in ADC mode for prolonged periods
• constant ADC operation on hilly or mountainous terrain
• ADC is the primary mode of all-wheel-drive operation
If the front gearcase is making excessive noise during ADC operation, change
the demand drive fluid. If the noise continues, please see your POLARIS
dealer or other qualified service facility for service.
Use the recommended fluid. Use of other fluids may result in improper operation
of components. Maintain the fluid level at the bottom of the fill hole threads. The
fill plug is located on the right side of the demand drive unit. The drain plug is
located on the bottom right side of the unit.
FLUID CHECK
1. Position the vehicle on a level
surface. Remove the fill plug
Check the fluid level.
2. Add the recommended fluid as
needed to bring the level to the
bottom of the fill hole threads.
3. Reinstall the fill plug. Torque to
specification.
FLUID CHANGE
1. Position the vehicle on a level surface. Remove the fill plug.
2. Place a drain pan under the demand drive unit. Remove the drain plug
Allow the fluid to drain completely.
3. Clean and reinstall the drain plug. Torque to specification.
4. Add the proper amount of the recommended fluid.
5. Reinstall the fill plug. Torque to specification.
6. Check for leaks. Dispose of used fluid properly.
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