It doesn't really matter about the hole other than it may allow dust or mud into the Drum. You could use a thin shim washer to block the hole if you have one or make up a rubber shield. The Bearing/Bush does partially block the hole anyway. The Bearing that you want is adjusted to centralize the shoes in the Drum so it does need to float a bit. You slacken off the two large nuts and adjust the Brakes shoes up tight and then strike the brake shaft with a mallet up and down a few times, to make sure that the shoes are central in the Drum. Now tighten the two large nuts TIGHT and then slacken the brake adjuster 6 clicks and test them. Once they are balanced tighten the centralizer, this is the 11/16 a/f nut below the square adjuster. You should check that the Independent brake pedals on each side are free and work or you will not be able to balance the brakes properly. To test the independent brakes, LIFT each Pedal in turn and if the Brake rod down either side of the Transmission bends,then it is seized at the inboard joint of the independent brake pedal and this need freeing off before the brake will operate properly. The Brake centralizer that holds the adjuster should have TWO short legs or pins to hold the Centraliser, often they are broken because the brakes are adjusted without slackening off the Centralizer first. This is the 11/16 a/f nut below the Square adjuster. If you need all this in more detail and written out for you, email me at the address below and I will send it to you.. John(UK)... fergusontractors@hotmail.com
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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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