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Charger Electric Bike - Rear Wheel Removal Procedure (part 3)
Pull the pedal chain back and out over the frame to hang out of the way. Now there's nothing holding the wheel to the frame so slide it back and off.
Re-assembly starts with replacing the wheel onto the frame.
Put the chains back where they came from. Pull the axle back until the "banjo" tensioner bolt assembly fits onto the rear of the frame.
Tension for both pedal and motor chains is important. The motor chain, which is adjusted after the pedal chain, is easily adjusted by turning the Allen head motor tensioning screw in and out. The pedal chain is adjusted the way BMX bikes are done: loosen both axle nuts, move the rear wheel forward or rearward, and retighten the axle nuts. A broom handle-sized dowel works to pry between the frame and the tire. On bikes with fenders, this doesn't work unless you turn the bike upside-down (not practical). For this reason, Charger bikes also have a "banjo" bolt chain adjuster that goes on the right axle before the two lock washers and nut. The "banjo" allows chain adjustment by turning a nut (after the axle nuts and brake housing-to-frame nut are loosened). With the pedal chain nearly the right tension, lock down the left side with the wheel cocked to the left slightly. Then, tighten the banjo nut on the right to both straighten the wheel and tighten the chain tension.
Once the pedal chain is set, this is a rare adjustment. However, you should check the motor chain tension regularly. It should not be too tight or too loose (about 1/2 inch of movement at the middle), and ride no closer than a sixteenth to eighth of an inch from the pedal chain. We emphasize chain tension and alignment because broken chains are a pain to replace (usually fail if they are too tight or catch on the adjacent chain), and loose chains that come off can get damaged and possibly damage the torque sensor. (PLEASE NOTE: If the Allen head screws holding the torque sensor in place become loose, this could cause the pedal chain to come in closer contact with the motor chain, causing problems. There must be 2 washers between these Allen head screws and the torque sensor plate, and we also recommend "LocTite".)
