Bobcat Mower Blade Bolt Torque Specs
Bobcat (now part of Doosan) commercial mowers — Predator-Pro, Pro-Cat ZT, and the legacy Walker-built ranger — use a 15/16" hex blade bolt with prevailing-torque locknut.
What torque should I use on a Bobcat blade bolt?
Bobcat blade bolt torque is typically 100–120 ft-lb on a 15/16" socket with 5/8"-18 UNF thread. Threadlocker: Not required (prevailing-torque locknut handles it). Always confirm the exact figure for your specific model — deck design, blade thickness, and spindle stack-up move the spec by 10–20 ft-lb between models in the same brand line.
Bobcat Predator-Pro 61" Zero-Turn blade bolt torque
100–115 ft-lb on a 15/16" socket, 5/8"-18 UNF thread. Replace prevailing-torque locknut on every install.
Bobcat ProCat 72" Zero-Turn blade bolt torque
110–120 ft-lb on a 15/16" socket, 5/8"-18 UNF thread. Three-blade deck. Re-torque after 5 hours.
Pro tip for Bobcat blade service
Bobcat prevailing-torque locknuts are one-use — the nylon insert is destroyed on first removal. Never re-use the nut, only the bolt.
Step-by-step Bobcat blade-bolt reinstall
Disconnect the spark plug, engage parking brake, tip the mower (carb-side up). Block the blade with a 2×4 — never your hand. Use a 1/2" drive breaker bar with a 6-point socket. Clean threads with brake cleaner. Apply Not required (prevailing-torque locknut handles it). Torque in one smooth pull with a calibrated torque wrench. Re-check after first hour of cutting.
Related lookups
- All Mower Blade Bolt Torque Specs
- Briggs & Stratton Blade Bolt Torque
- Walk-Behind Mower Blade Bolt Torque
- Bobcat Predator-Pro 61" Zero-Turn (100–115 ft-lb)
- Bobcat ProCat 72" Zero-Turn (110–120 ft-lb)
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