Drive System

Content Source: 2019 Timbersled ST 120 RAW Owner’s Manual (9928985 R01) > Maintenance Chapter

IMPORTANT

The Owner's Manual for this vehicle contains warnings, instructions and other information you must read and fully understand before safely riding or performing maintenance on this vehicle.Always follow the warnings and instructions in Owner's Manual.

Click the CONTENTS link above for the Table Of Contents, or download a full PDF of the Owner Manual in the Owner Support area of Polaris.com

Drive System

Drive Chain Tension

NOTE

Always ensure that your snowbike is positioned on a flat even surface with no wheel kit positioned under it before adjusting the drive chain. Also ensure that your snowbike is free of all snow and debris before adjusting.

TFS (Timbersled Fixed Strut) Models

Check drive chain tension before riding. Place a ruler on the top of the chain tensioner pivot point. Measure a total of ½” to 5/8” up and down free play on the top side of the chain. Do this by pinching the chain with your fingers and lightly pushing and pulling up and down. If the chain needs to be adjusted, loosen the jam nut on the adjuster bolt. Adjust the bolt as needed and tighten the jam nut. Recheck again for proper adjustment.

TSS (Timbersled Suspension Strut) Models

Always check the engine chain tension before riding: first, set the TSS shock air pressure to 250 psi. Next, position a ruler behind the top chord of the drive chain halfway between the counter shaft sprocket and the jack shaft sprocket. Position and steady the ruler so it does not move as chain free-play is measured. Measure a total of ½" to 5/8" of up-and-down free-play on the top side of the chain. Do this by pinching the chain with your fingers and lightly pushing and pulling up and down. If the chain needs to be adjusted, loosen the jam nut on the adjuster bolt and adjust as needed. Tighten the jam nut once completed.

IMPORTANT

The chain will become looser as the TSS suspension compresses. It is extremely important that you keep the chain adjusted properly (taut) for long chain life and reliability.

Chain Case Chain Adjustment

It is recommended that you check the chain case chain adjustment each time the chain is lubed. Remove the fasteners that hold the chain case cover on. Place a ruler against the back side of the idler sprocket with the ruler facing back. Measure a total of 1/2” to 5/8” front to back free play on the back side of the chain. Do this by pinching the chain with your fingers and lightly pushing it front to back. If the chain needs to be adjusted, loosen the nut(s) that hold the tensioner on. Adjust as needed and tighten the nut firmly. Check once more for proper adjustment.