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2016-2021 SKS Chaincase Fluid Replacement

Required Tools and Supplies
Drain Pan (Front Cover Method)Shop Rags
Torque WrenchRatchet
Prying Tool (Front Cover Method)Fluid Filler
T40 TORX® Socket (Front Cover Method), 10mm Socket (Front Cover Method) and 6mm Allen SocketFluid Suction Device (Suction Method)
Safety GlassesNitrile Gloves

For more information on tools, visit the Tools and Fasteners Guide.

This video will outline the pump and front cover methods that can be used to change the chaincase fluid on a Polaris AXYS platform SKS 146 or SKS 155. Always wear safety glasses and nitrile gloves when servicing your snowmobile.

1. Ensure the vehicle is on a flat level surface.

2. Set the parking brake.

3. Clean the area around the fill plug. Tip: Place a rag under the fill plug to catch any escaping fluid.

4. Remove the fill plug with a 6mm Allen socket and set aside.

5. To extract the fluid using the pump method:

  • Safely elevate the front of the snowmobile using a floor jack or appropriate lift.
  • Insert the tube of the suction device into the fill hole. Direct the hose toward the bottom front area of the cover, away from the chain and sprocket.
  • Extract the oil from the chaincase.
  • And safely lower the snowmobile.

6. To drain the fluid using the front cover method:

  • Remove the right side panel by releasing the rubber strap and turning the two quarter-turn latches. Pull the panel out and remove.
  • Remove the three push rivets securing the side panel trim. Pull the trim apart as needed.
  • If equipped with a battery, remove the battery and bracket.
  • Remove the two T40 TORX fasteners securing the lower fender to the chaincase.
  • Place a drain pan underneath the chaincase. Tip: Place a rag in the bottom of the drain pan to prevent the splashing of fluid.
  • Using a 10mm socket, loosen but do not remove the three lower chaincase cover screws.
  • Carefully pry the cover open on the cover tab. Caution: DO NOT insert a screwdriver or pry bar between the cover and chaincase. Seal damage may occur.
  • Allow the fluid to drain completely.
  • Reinstall the three cover fasteners. Torque to 11 ft-lbs (15 Nm).

7. Fill the chaincase through the fill plug hole until fluid reaches the bottom threads and begins to spill out. A 1-quart bottle of Polaris Synthetic Chaincase Lubricant is part number 2873105.

8. Reinstall the fill plug. Torque to 4 ft-lbs (6 Nm).

9. Clean any residual fluid off the vehicle and dispose of the used fluid properly.

10. If using the front cover method, continue with the following steps:

  • Reinstall the fasteners securing the lower fender to the chaincase. Torque to 36 in-lbs (4 Nm).
  • If needed, reinstall the battery and bracket. Ensure the harness is properly routed inside the bracket.
  • Reconnect the side panel trims and reinstall the three push rivets.
  • Then reinstall the side panel by inserting the tabs on the front and bottom. Secure the rubber strap and two quarter-turn latches.

Looking for information on adjusting drive chain tension? Read SKS Drive Chain Tension Adjustment.

For more information, see your authorized Polaris Dealer. To find a dealer near you, use the Dealer Locator.
Maintenance tips, procedures and specifications can be found in your Owner's Manual.
To find diagrams and replacement part numbers, use the online parts catalog.

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