Always rotate spring with direction of spring wrap. Remove spring from inside clutch for better cleaning.Loosen locknut, and all parts from the axle. Hold the brake arm as a lever, and use a wrench on the left side nut. Use care, as the brake shoe or other parts may fall out. Remove cone and turn driver counter-clockwise to remove it from the shell. It will be useful to lay part out in orientation as they come off axle and out of hub. By flipping the sprocket, it will move in or out from the hub, which will effect alignment to the front sprocket. Note orientation of sprocket if it is asymetrical.Use narrow tipped straight blade screwdriver to remove a snap ring holding the sprocket. If available, use axle vise to hold wheel with right side upward.This allows the axle to be quickly centered during reassembly. Measure and record axle protusion off left side. Note axle protusion on both left and side.Remove wheel from from bike and remove axle nuts and washers from axle.Begin by loosening brake arm stop screw to free arm from frame.Generally, use grease capable of higher temperatures. It is important to grease the shoes, bearings, and all internal parts. There can be a substantial amount of friction inside the shell. There is a long brake arm that is fixed against the frame of the bike to prevent the left cone from turning. As the shoes drag against the shell, they attempt to turn the left side cone. The shoes are pushed outward into the shell. If the pedals are moved backwards, the clutch pushes into the brake shoes. When the pedals stop turning, the clutch pulls away from the hub shell. The clutch end is serrated with sharp teeth and these literally jam into the hub shell, turning the shell and wheel forward. As the bicycle is pedaled forward, the sprocket turns the driver into the clutch. These types are of hubs are not considered “high performance,” and are limited in their ability to stop the bike.Ī basic coaster hub is seen below. Rotating the pedals backwards expands the brake shoes into the steel hub in order to slow the bike. The clutch then disengages for coasting or braking. A clutch mechanism allows the hub to engage and drive the bike forward. The hub contains internal brake shoes housed inside a metal shell. Park Tool axle and pedal vise AV-1 or AV-5.
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January 2023
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