Causes and treatment methods of failure of V&VQ series vane pump of injection molding machine

1. The most common causes and troubleshooting of V&VQ series hydraulic pumps of injection molding machines:

（1）Cause of failure: wrong rotation direction (forward, counterclockwise); solution: stop immediately and correct the rotation direction of the motor.

（2）Cause of failure: The pump does not rotate; Solution: Check whether the motor power supply is powered on, and confirm whether the coupling or key is damaged.

（3）Cause of failure: The pump shaft is broken and the rotor does not rotate; Solution: Repair the pump and confirm whether the motor rotation speed is too high and whether the axis is aligned with the center.

（4）Cause of failure: The suction pipe is blocked; Solution: Check the suction pipe.

（5）Cause of failure: The suction oil filter is blocked; Solution: Clean the suction oil filter.

（6）Cause of failure: Insufficient flow rate through the fuel tank filter; Solution: Replace with a larger suction filter screen to ensure at least 2.2 times the flow rate of the hydraulic oil pump per minute.

2. Causes and solutions to the failure of the hydraulic V&VQ series vane pump of the injection molding machine without oil discharge:

（1）Cause of failure: The viscosity of the oil is too high; Solution: Replace the oil with the specified viscosity

（2）Cause of failure: insufficient number of rotations; solution: select the motor rotation speed according to the minimum rotation speed specified by the pump.

（3）Cause of failure: The suction pipe is not airtight enough; Solution: Check the suction pipe.

（4）Cause of failure: The fuel tank filter is above the oil level; Solution: Add oil to the reference point above the oil level gauge.

（5）Cause of failure: The blade cannot slide out of the rotor groove; Solution: Repair the pump.