Dixon ZTR 4000 Series Operator's Manual page 21

CARE AND MAINTENANCE - 4000 SERIES MODELS
CUTTER BLADE MAINTENANCE:
NOTE: Observe proper blade position prior to removal.
1. Safely raise front of mower.
2. Hold or block blade from turning.
NOTE: Be sure blade is centered on pilot before tightening bolt to 60 ft. Ibs. torque.
Page 18
Wear heavy, thick gloves when holding onto cutter blade,
avoid the sharp edge of the blade.