Tighten the Drive Chains

A70496-UN-31JAN11

Drive Chain With Tension Idler

A70495-UN-31JAN11

Drive Chain Without Tension Idler

A - Shaft Distance

B - Straight Edge

C - Ruler

To determine chain deflection, perform the following procedures:

1. Rotate the drive to tighten the chain.
2. Place a straight edge (B) over the slack span of the chain.
3. NOTE: Make sure that one side of the chain is taut during measurement.
   At the center of the shaft distance (A), use a ruler (C) to measure the deflection from the top of the chain to the underside of the straight edge.

4. IMPORTANT: Do not over tighten the chains or rapid chain wear, shaft, and bearing damage can result.

   Adjust the shaft centers or chain tighteners to specification.

   Item	Measurement	Specification
   Chain	Deflection	6.4 mm (1/4 in) of chain deflection per 31 cm (12 in)