Adjust Centerline Chain Tension

This procedure applies only to Retro C saws with the newer centerline chain-drive system. It does not apply to centerlines using the older Joyce actuator drive.

Safety: Position the centerline using the software, then lock out the machine and verify that it cannot move before removing the cover or touching the chain and sprockets.

Position and open the centerline

1. Move the centerline down near its minimum position.
2. Raise it back up to 0-2-8. Approaching from below creates a consistent inspection condition.
3. Stop and lock out the machine.
4. Remove the gray centerline cover by removing its two 7/16-inch bolts.

Adjust the idler sprocket

The bolt and nut below act as the idler-sprocket shaft. Use an Allen wrench to adjust both sides evenly: move the shaft downward to tighten the chain or back it off to loosen it.

• Make small, equal adjustments so the idler stays square.
• Do not overtighten the chain; excessive tension loads the sprockets, bearings, shaft, and drive.
• Confirm that the chain is seated on every sprocket and does not contact the frame.
• Tighten the locking hardware without allowing one side to move.

Reassemble and verify

1. Confirm consistent chain tension through the accessible travel.
2. Reinstall the gray cover with both bolts.
3. Clear tools and personnel, then remove lockout/tagout.
4. Move the centerline slowly through its normal range and listen for rubbing, snapping, or uneven chain noise.
5. Return to 0-2-8 several times and confirm repeatable positioning.

If the chain cannot be tensioned evenly, has damaged links, rides up on a sprocket, or quickly becomes loose again, stop and contact Enventek Support.

Related Articles

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• understand centerline vertical movement