This is a replacement Brake Hub/Drum designed for 4 cycle gas E-Z-GO golf cars, personnel carriers, and small wheel utility trucks made from 1991 to present.
E-Z-GO Factory Part #: 21807G1P (Replaced # 21807G1)
This includes the following models: 4 Caddy, TXT 2+2 & Clays Car, 804, Tuff 1, the WorkHorse & MPT models 800 (4-cycle gas only) & the 1200. Also includes the Cushman Commander gas 280 & 2200 model trucks, the Jacobson 1110 gas truck and the Brouwer LX1200 truck--all made by E-Z-GO for these companies.
This hub/drum will not work on the E-Z-GO ST350 big wheel trucks, nor the ST480 or ST 4x4 trucks with hydraulic brakes. Also not suitable for the 800 and 900 series heavy duty gas powered burden carriers in the E-Z-GO product line.
This brake drum has a 15/16" center hole with an internal 30 tooth 'star' spline to interface with the axle. It is held in place by a castellated nut (3/4" x 16tpi) and a thick (.118") flat washer. The earlier 2-cycle gas and all the electric model hub/drums (shown at right) have a smaller hole and are not interchangeable with this hub/drum.
Note 1: A thin shim (.032") is required between the drum and the axle bearing. The thin shim and thick outer flat washer are essential to the proper tightening of the hub/drum to the axle. The shim slides onto the axle and fits between the inner hub/drum surface and the axle bearing. The thick washer goes against the outer hub/drum, followed by the castellated retainer nut. Tighten the nut to 80 foot pounds (140 ft lbs max.), using a torque wrench, and then tighten a little more to the next position so as to insert a cotter pin.
Note 2: If the nut works loose, the entire hub/drum will start to rock on the splines each time you start and stop the car. Eventually, the splines in the hub/drum will strip out and the car will not move, even though the engine (or motor) seems to work fine. If this happens to you, look at the hub/drum retainer nut as someone starts the car. If the nut spins and the car does not move, then the drum has spun out and you will need to replace it. Usually the axle is okay, but be sure to clean the axle splines before installing the new drum.
Note 3: Clean off any dirt or rust and check for grooves or excessive wear, especially at the edges. Scruff up the inner drum surface and the brake shoe material with some course sandpaper to deglaze the surfaces. If you can't get the rust off, or if the drums are badly worn, replace them. They should not be resurfaced on a brake lathe.