Dixon 5000 Series Operator's Manual page 34

CARE AND MAINTENANCE
MODEL ZTR 5421 DRIVE SYSTEM ADJUSTMENTS
TWISTED BELT ADJUSTMENT:
5. The idler pulley travel required to engage the belt drive should be held to
approximately 1 3/4".
A. To adjust this distance, loosen the nuts on both ends of the rod extending
between the idler plate and the brake shaft.
B. Turn the rod as required to achieve desired pulley travel of approximately 1 3/4"
when the brake handle is released.
C. Tighten nuts firmly against the ball joint rod ends.