Bobcat ProCat 72" Zero-Turn Blade Bolt Torque

The blade bolt torque on the Bobcat ProCat 72" Zero-Turn is 110–120 ft-lb, using a 15/16" socket with 5/8"-18 UNF thread. Three-blade deck. Re-torque after 5 hours.

What's the exact spec for the Bobcat ProCat 72" Zero-Turn?

Torque: 110–120 ft-lb. Socket: 15/16". Thread: 5/8"-18 UNF. Threadlocker: Not required (prevailing-torque locknut handles it). Three-blade deck. Re-torque after 5 hours.

Step-by-step Bobcat ProCat 72" Zero-Turn blade-bolt reinstall

1) Disconnect the spark plug and engage the parking brake. 2) Block the blade with a 2×4 wedged against the deck shell — never your hand. 3) Use a 1/2" drive breaker bar with a 6-point 15/16" impact socket to break the bolt loose. 4) Clean threads with brake cleaner and inspect the bolt for stretch. 5) Apply a drop of blue threadlocker (Not required (prevailing-torque) to the bolt threads. 6) Torque to 110–120 ft-lb in one smooth pull with a calibrated torque wrench. 7) Re-check after the first hour of cutting.

Common Bobcat ProCat 72" Zero-Turn blade-bolt mistakes

Over-torque past spec stretches the bolt past yield — it will not hold the next reinstall. Under-torque lets the blade walk loose at full RPM, which destroys the spindle key and balance. Using a 12-point socket on a rusted bolt rounds the head; always use 6-point. Bobcat prevailing-torque locknuts are one-use — the nylon insert is destroyed on first removal. Never re-use the nut, only the bolt.

What socket fits the Bobcat ProCat 72" Zero-Turn blade bolt?

A 6-point 15/16" impact socket on a 1/2" drive breaker bar. A 12-point socket can be used in a pinch on a clean, sharp-edged bolt head — never on a rusted bolt. 5/8"-18 UNF thread, so a metric thread chaser will not work — use the correct UNF chaser if the threads are damaged.

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