I got home quicker than I thought. This is an 8N. 9N / 2N are a little different. Hope this helps.
When the brakes can no longer be adjusted to satisfactorily stop the tractor or assist in turning, the brake linings and shoes should be replaced.
Jack up the rear end of the tractor, and remove the rear wheels. Remove the four screws from the brake drum, and slide the drum off the shaft (fig. 28 ).On the left brake, remove the two retracting springs. On the right brake, remove the one retracting spring. Remove the brake shoes (fig. 29). If one brake shoe is replaced, it is advisable to also replace the other three shoes to assure equalized braking action. Inspect the brake backing plate felt, and replace it if needed. Inspect the anchor pin, if worn, replace brake support plate.
Place the shoes in the brake support plate, and attach the retracting spring (fig. 30). The left brake has two retracting springs, and the right brake uses one retracting spring. Adjust the brakes so they are completely, retracted, and install, the brake drum. Mount the rear wheel.
Jack the tractor up until both rear wheels are free of the ground. Remove the brake adjustment cover, and turn the adjustment (fig. 31) until the brake drags with the pedal in the released position. Back off the adjustment until the wheel turns with a very slight brake drag. Shorten or lengthen the left brake tie rod, by using the clevis, until both brake pedals are in line with both brakes engaged. During the first hour of operation, after, the brakes have been adjusted; feel of the drums occasionally to be sure that they are remaining cool. If the drums are hot, readjust as outlined above.