that is the old power lift system. it operates with a trip rope. all the old machinery used this before hydraulics took over. found on plows, cultivators, tillers, and seed drills. even if you are stationary and pull the rope the plow should fall down. when you are moving the wheel rotates and locks it in the down position.when you come to the end of the furrow you pull the trip rope and the rotating wheel wheel locks it in the up position. not much in there , just a cam and roller. might want to take it apart and give it a good cleaning as it may be full of dirt and dried grease preventing it from operating properly. you can then check for wear were the roller operates.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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