1. The electric vehicle has the feeling of stopping, fast and slow, and weak while driving.
Reasons and solutions:
(1) The seven-core connection is in poor contact → change the seven-core line.
(2) The Hall power-off brake lever is in poor contact → change the Hall power-off brake lever.
2. The battery of the electric vehicle is sufficient, the indicator lights are all on, but the load wheel is weak.
Reasons and solutions:
(1) The gear is worn and slippery → replace the gear.
(2) Part of the winding of the hub motor is short-circuited → replace the motor.
(3) Electric bicycle assembly problems or parts wear → replace the vibration damping rubber.
Third, the electric vehicle motor drive has irregular stalls
(1) The controller and the electric hub connector are loose or have poor conduction → reinsert the connector or replace it.
(2) The carbon brush of the hub motor is in poor contact with the rotor → troubleshoot the fault according to the hub maintenance method.
Fourth, the noise of electric bicycle motor drive
(1) The wheel hub gear is short of oil → open the wheel hub and apply gear grease.
(2) The gear is defective → replace the gear.
(3) The bearing of the gear housing is damaged → replace the bearing.
Fifth, the electric vehicle is disconnected
(1) The chain is too loose → tighten the chain
(2) If the rear wheel has no position to move back, and the chain is still too loose, the chain should be disassembled and shortened, and then installed and adjusted. (3) The sprocket, chain and flywheel are not on the same plane → ① install the sprocket, ② install the rear wheel, ③ correct the position of the deformed frame and the vertical fork.
6. Stepping on the air. When riding the pedals, the chain cannot drive the car forward, or sometimes it drives, sometimes it doesn’t move. In most cases, it is caused by bad flywheel or bad mesh between flywheel jack and the outer cover → ①Clean the dirt in the flywheel so that the jack can bounce and work without being stuck by the oil. ② Correct the jack spring so that it is hidden in the groove of the jack. ③Replace the jack spring. ④ When the head of the jack is severely worn, replace it with a new jack. ⑤ When the inner teeth of the flywheel jacket are severely worn, replace the flywheel jacket.　　
7. The rim of the electric car is erratic, sometimes to the left and sometimes to the right.
(1) The clearance of the rolling bearing of the front axle or the rear axle is too large → Adjust the clearance of the rolling bearing.
(2) The elasticity of the spokes is different, and it is fixed at a certain position by fluttering → adjust the elasticity of the spokes.
(3) The steel balls in the front axle or the rear axle are damaged or have different sizes → replace the steel balls.
Eight, the front wheel of the electric vehicle is driven to the left or right
(1) The front axle nut is loose → adjust the front axle rolling bearing clearance, and tighten the front axle nut.
(2) Relative movement between the handlebar and the front fork due to collision or loosening of the core bolt → Tighten the core bolt.
(3) Deformation of the front fork riser or front fork leg → Correct the front fork riser or front fork leg. If the fault cannot be eliminated, replace the front fork.
9. The front or rear wheels of the electric vehicle shake
(1) The front wheel is shaking indefinitely on the front fork and the rear wheel in the frame fork or vertical fork → the front axle or rear axle nut is loose and tightened.
(2) The rolling bearing assembly of the front axle or the rear axle is too loose → adjust.
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