H&S W3243 Operator's Manual page 23

ADJUSTMENTS
UPPER BEATER
Eye Bolt Adjuster
The upper beater drive chain has a spring-loaded
tightener. Tighten the eye bolt to increase the spring
tension. Maintain a 1/16" gap between the spring coils
for proper tension. If a 1/16" gap between the coils
cannot be maintained, a chain link must be removed,
or the chain replaced.
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