Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

Well Friday the Self propel mechanism began to act up on my Toro Personal pace lawnmower. (Model 20017) It wouldn't free wheel in revers on the right wheel. I pulled it a part and found the key and spring gunked up. I found the grease in the gear box all caked with dirt and useless. The spring/key on the other wheel was stuck in the slot and the wheel didn't engage with the drive mechanism. I also replaced the pulley / bladed spacer and belt because it was worn/ square to the bottom. ( you actually need to pull the gear box to replace the belt on this machine) This wasn't an easy machine to work on. It works well after putting it back together. There is one minor issue. When I engage the propulsion unit wiht the wheels on the ground I get a buzzing noise. If I lift the wheels with the propulsion engaged there is no buzzing sound. Any ideas on the cause noise