What are the common faults of Punch CVT transmission?
1 Answers
Common faults of Punch CVT transmission are as follows: 1. Abnormal oil pressure: Abnormal oil pressure can cause shaking and abnormal noise during acceleration, mainly due to insufficient or excessive oil pressure causing chain damage or slippage. Due to abnormal lock-up oil circuit of the torque converter, the engagement and release of the lock-up clutch malfunction. Due to abnormal oil pressure of the forward clutch, its engagement and release malfunction. During maintenance, check the oil pressure of the main oil circuit, lock-up release oil pressure, forward clutch oil pressure, and primary/secondary chain wheel oil pressure. 2. Insufficient oil volume: For CVT transmissions, when the oil temperature reaches 65°C, the transmission oil starts flowing to the radiator, at which time the fluid level in the oil pan will significantly decrease. An excessively low fluid level can cause chain slippage and abnormal noise during acceleration, ultimately damaging the transmission. 3. Bearing failure: This is a common cause of transmission noise. Even with normal oil pressure and volume, abnormal noise may occur during acceleration due to bearing failure. If the noise increases with engine speed, it indicates failure of the primary chain wheel bearing. If the noise does not change with engine speed, it indicates failure of the secondary chain wheel or final drive bearing. Sometimes the noise may also be accompanied by excessively low oil pressure in the secondary chain wheel, because the failed bearing causes the shaft to deviate from the center and damages the input oil seal of the chain wheel. 4. Engine speed fluctuation at idle or engine stalling when shifting into gear: In this case, check the oil pressure of the forward clutch, radiator flow rate, and lock-up engagement and release oil pressure.
