I have a 2002 walker, 48" GHS with a 26 kohler. Ran the mower for approx. 3 hours today, stopped to replace blades and noticed there was no tension. I was able to swap them and tighten with torque wrench. Continued mowing for 5 minutes noticed a strange noise and there was smoke coming from the central gear box. My local repair shop is a WEEK behind and said that it could be anything from a shear pin to the clutch or a belt. Does anyone have any experience with this, or should I bite the bullet and put it in the shop in the morning.