JJT
Veteran Member
- Joined
- Oct 13, 2001
- Messages
- 1,814
- Location
- Upstate NY, USA
- Tractor
- Kubota L3710 HST and a Kubota ZD21 60Pro
My ZD21 has a round hole, no pins. Torque is 80#, the blades have never stopped spinning, no matter what height gets fed to it. 117# sounds a little high, but not drastically. I'd replace the hardware, as previously stated the bolts do stretch/wear out, as do the washers. I change or sharpen my blades annually, with about 50 hours of use a year.