Gravely Pro-Turn 260 (Commercial Zero-Turn) Blade Bolt Torque

The blade bolt torque on the Gravely Pro-Turn 260 (Commercial Zero-Turn) is 100–110 ft-lb, using a 15/16" socket with 5/8"-18 UNF thread. Stepped washer stack — cup first, flat second, then bolt.

What's the exact spec for the Gravely Pro-Turn 260 (Commercial Zero-Turn)?

Torque: 100–110 ft-lb. Socket: 15/16". Thread: 5/8"-18 UNF. Threadlocker: Blue Loctite 242 required. Stepped washer stack — cup first, flat second, then bolt.

Step-by-step Gravely Pro-Turn 260 (Commercial 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 (Blue Loctite 242) to the bolt threads. 6) Torque to 100–110 ft-lb in one smooth pull with a calibrated torque wrench. 7) Re-check after the first hour of cutting.

Common Gravely Pro-Turn 260 (Commercial 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. Gravely Pro-Turn 600 series uses a unique stepped washer stack — the order matters: cup-washer first, flat washer second, then bolt. Reversing them loses preload within an hour of mowing.

What socket fits the Gravely Pro-Turn 260 (Commercial 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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