Spartan Mower Blade Bolt Torque Specs
Spartan RT, RZ and SRT zero-turns share one blade-bolt spec in the current operator's manual: 130–140 ft-lb (176–190 N·m), also printed on the machine's warning decal. No socket or thread size is stated.
What torque should I use on a Spartan blade bolt?
Spartan blade bolt torque is typically 130–140 ft-lb (176–190 N·m). Threadlocker: Not called for in the Spartan manual cited below. 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.
Spartan RT-Pro 54" Zero-Turn blade bolt torque
130–140 ft-lb (176–190 N·m). Spartan 2026 Operator's Manual 3473-292 D (RZ-HD/RZ-XD/RT/SRT series; the manual Spartan links for the RT-Pro), p.5-24, Blade Service step 2: "Torque the blade bolt to 176 to 190 N∙m (130 to 140 ft-lb)." Repeated on the machine's decal 148-0430 (p.2-5). An older-generation Spartan manual printed 115–120 ft-lbs; the current OEM figure is 130–140. Socket and thread size are not stated.
Spartan SRT-XD 61" Commercial Zero-Turn blade bolt torque
130–140 ft-lb (176–190 N·m). Spartan 2026 Operator's Manual 3473-292 D (names SRT XD explicitly), p.5-24, Blade Service step 2: "Torque the blade bolt to 176 to 190 N∙m (130 to 140 ft-lb)." Repeated on decal 148-0430 (p.2-5). Socket and thread size are not stated.
Pro tip for Spartan blade service
Spartan's spec moved between manual generations — an older operator's manual printed 115–120 ft-lbs, the current one 130–140. Check the decal on your deck (148-0430) and use the figure it prints.
Step-by-step Spartan 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. No threadlocker needed unless your model manual specifies 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
- Spartan RT-Pro 54" Zero-Turn (130–140 ft-lb (176–190 N·m))
- Spartan SRT-XD 61" Commercial Zero-Turn (130–140 ft-lb (176–190 N·m))
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