Chain Case Chain Tension

It is recommended that you measure the chain case chain tension each time the chain is lubricated.

CAUTION

Do not over-tension the chain. Improper chain tension can cause excessive wear to the chain and the tension roller bolt.

To measure the chain case chain’s tension:

Remove fasteners from chain case cover.
Position a ruler behind or in front of the right chord of the drive chain halfway between the drive shaft sprocket 4 and the jack shaft sprocket 2 (this is where the chain’s displacement should be measured). Position and steady the ruler so it does not move as chain displacement is measured.
Choose a single chain link pin close to the ruler to use as a reference point for measuring chain displacement. Push the chain’s right chord to the left near the chosen link pin using 1 finger. Line up the 1 inch mark on the ruler with the center of the chosen chain pin.

Then, without moving the ruler, push the chain’s right chord to the right with one finger in the same location and count the number of ⅟₈” marks between the 1 inch mark and the new position of the chosen chain pin.

If the chain is properly tensioned, there should be between ½ in and ³∕₄ in between the 1 inch mark (the position of the chosen chain pin when pressed to the left) and the current position of the chosen chain pin (when pressed to the right). This is the chain case chain’s displacement measurement 1. If the chain’s displacement measurement is less or more than ½” to ³∕₄”, the chain tension needs to be adjusted (see Adjusting Chain Case Chain Tension).

To adjust the chain case chain’s tension:

Loosen the tension roller bolt 3.
Adjust the chain tension as needed by pushing the roller bolt 3 towards the chain to increase tension or away from the chain to lessen tension.
Then tighten the tension roller bolt 3 firmly once again.
Measure the chain case chain’s displacement 1 once more to ensure proper adjustment.