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

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

   Adjust 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.)