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2015-2021 Switchback Pro-S Chaincase Fluid Replacement

Required Tools and Supplies
Shop RagsRatchet
Pliers (Front Cover Method)Torque Wrench
T40 TORX® and 10mm Sockets (Front Cover Method)Fluid Filler
Prying Tool (Front Cover Method)Fluid Suction Device (Suction Method)
6mm Allen SocketDrain Pan (Front Cover Method)

For more information on tools, read 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 Switchback Pro-S. 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. Placing a rag under the fill plug will help catch any escaping fluid.

4. Remove the fill plug with a 6mm Allen socket. 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 using the suction device.
  • Then safely lower the snowmobile to fill the chaincase.

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 lift up to 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.
  • Using a T40 TORX® socket, remove the two fasteners securing the lower fender to the chaincase.
  • Place a drain pan underneath the chaincase. Placing a rag in the bottom of the drain pan will help prevent the splashing of fluid.
  • Loosen but do not remove the three lower chaincase cover fasteners with a 10mm socket. 
  • Carefully pry the cover open on the cover tab. DO NOT insert a screwdriver or pry bar between the cover and chaincase or 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.

8. Clean any dirt or debris from the fill plug.

9. Inspect the O-ring on the plug and replace if necessary. 

10. Reinstall the fill plug. Torque to 48 in-lbs (6 Nm).

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

12. 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 bracket and battery. Connect the positive cable first. 
  • Reconnect the side panel trim and reinstall the three push rivets. 
  • Then reinstall the side panel by inserting the tabs on the bottom and top. Secure the rubber strap and the quarter-turn latches.

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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