Troy-Bilt Mower Blade Bolt Torque Specs

Troy-Bilt Pony and Bronco lawn tractors are MTD-built and use a 5/8" blade bolt; TB-series zero-turns step up to 15/16". Walk-behind TB30 and TB230 use 13/16".

What torque should I use on a Troy-Bilt blade bolt?

Troy-Bilt blade bolt torque is typically 70–90 ft-lb on a 15/16" socket with 5/8"-18 UNF thread. Threadlocker: Not required. 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.

Troy-Bilt Pony (17.5HP, 42" Deck) blade bolt torque

70–80 ft-lb on a 15/16" socket, 5/8"-18 UNF thread. Twin-blade MTD deck. Cone washer cup-side toward bolt head.

Troy-Bilt TB230 21" Self-Propelled Walk-Behind blade bolt torque

35–45 ft-lb on a 13/16" socket, 3/8"-24 UNF thread. Right-hand thread on 2013+ models. Use brake-clean on threads first.

Pro tip for Troy-Bilt blade service

Troy-Bilt zero-turn spindle pulleys share the same blade bolt thread on most decks — useful if you snap the bolt and need an emergency replacement from a pulley.

Step-by-step Troy-Bilt 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. Torque in one smooth pull with a calibrated torque wrench. Re-check after first hour of cutting.

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