VB1 Classic Adult Tricycle Troubleshooting

Q1 The short chain is prone to slipping.

The short chain may be slipping for the following two reasons:

1. The chain is too loose.

Solution: Loosen the four screws that fix the front and rear frames, pull the rear frame backward, and ensure the chain is taut before tightening the screws again.

2. The sprocket on the secondary drive shaft is not aligned with the sprocket on the rear axle.

Solution: Loosen the hex bolt that fixes the sprocket on the rear axle (as shown in the figure below), and move the sprocket on the rear axle left or right to align it with the sprocket on the secondary drive shaft.

Q2: Cannot switch to the minimum or maximum gear.

If you cannot switch to themaximum gear, use a Phillips screwdriver to rotate the screw on the right side of the derailleur ( H ) until the small cog on the derailleur aligns with the smallest gear on the flywheel. If you cannot switch to the minimum gear, use a Phillips screwdriver to rotate the screw on the left side of the derailleur ( L ) until the small cog on the derailleur aligns with the largest gear on the flywheel.

Q3: The brake is too loose and does not work effectively.

While squeezing the brake lever, observe whether the brake cable at the caliper contracts. If the brake cable does not contract, check if the lever retention clamp is properly installed and if the brake cable is fully seated in the slot, as shown in the figure. If the brake cable contracts when the lever is squeezed, it may be that the brakes are too loose and need to be tightened. You can refer to the following video Brake Line Adjustment