Dixon ZTR 5020 Operator's Manual page 36

CARE AND MAINTENANCE
PARKING BRAKE CABLE ADJUSTMENT:
Position parking brake lever in the off or disengaged position.
This will allow the belt idler used on the engine to T-box to swing fully and apply tension
to the belt.
At this time, check that the cable which pulls the idler to a neutral position has
approximately 1-1/2 to 2 inches of free play.
If adjustment is required, loosen the lock nuts on the cable block and turn cable sleeve
in or out to achieve desired measurement.
Re-tighten lock nuts.
NOTE:
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Cable must have the above dimension with parking brake released or
drive belt may slip, causing loss of power.