Replace blades when: cutting edge is rounded and won’t sharpen further (typically after 3-4 sharpenings), blade is visibly bent from rock strike, cracks appear anywhere on blade, or blade mounting holes are elongated. Standard blades: 50-100 hours in normal conditions. Heavy-duty 1/2″ blades: 100-200 hours typical. Always replace in complete sets — mixing new and worn blades causes vibration and uneven cutting. A bent blade should be replaced immediately, never straightened and reused.

Woods’ model naming can be genuinely confusing — BB600 and BB600X are different machines with different blade requirements, and the same is true for BB72 vs. other BB variants. The “X” suffix and other small naming differences usually indicate a different deck size, gearbox rating, or production generation, which changes the blade length and mounting pattern needed. Always check your model tag exactly, including any letter suffix, before ordering — don’t assume a close model name means the same blade fits.

Sharpen 3-4 times before replacing (if no bends or cracks). Maintain the original 30-degree bevel angle, and grind equal amounts from both blade ends to preserve balance. Check balance after sharpening on a balance cone — if one end drops, grind more from that end. Professional sharpening runs $8-15 per blade; DIY with an angle grinder takes 10-15 minutes per blade and costs nothing but your time. Replace when metal is too thin (under 3/16″), you can’t balance it after sharpening, or the blade has shortened below its minimum deck-coverage length.

A loud banging sound usually means a bent blade tip curling upward and striking the deck on rotation, debris jammed between blade and deck, a bent blade carrier allowing excessive travel, deck damage from a previous impact reducing clearance, an incorrect (too-long) blade for that deck, or cutting height set too low causing scalping and ground contact. Stop immediately if you hear this — continuing causes serious damage quickly and creates a dangerous shrapnel risk. Inspect and replace any bent components before resuming operation.

Standard torque for most Woods rotary cutter blade bolts is 120-150 ft-lbs for 5/8″ Grade 8 bolts, or 90-120 ft-lbs for 1/2″ Grade 8 bolts — but always check your specific model’s operator manual, since torque varies by model and bolt size. Use Grade 8 bolts only (marked with 6 radial lines on the bolt head) — never Grade 5 (3 lines) or unmarked hardware store bolts, which fail under blade impact loads. Apply anti-seize compound to threads for easier future removal, and re-torque after the first 2 hours of operation as new bolts settle. Check torque again every 25 hours — vibration loosens blade bolts over time.