Dixon ZTR 5000 Series Operator's Manual page 34

PARKING BRAKE CABLE ADJUSTMENT:
Make necessary adjustments to the T-Box to Hydrostat belt, as shown on page 30.
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 has approximately 1-1/2 to 2 inches of free play.
If adjustment is required, turn the lock nut illustrated below to achieve a recommended
1-1/2 to 2 inches of free play.
NOTE:
Page 32
CARE AND MAINTENANCE
Cable must have the recommended 1 -1/2 to 2 inches of free play with parking
brake released or drive belt may slip, causing loss of power.