以下是扭剪扳手常见的故障及维修方法：

The following are common faults and maintenance methods for torsion shear wrenches:

1. 扭剪扳手无法扭转：可能是扳手内部的齿轮损坏或者润滑不足。方法是拆开扳手，清洁和润滑齿轮，或者更换损坏的齿轮。

1. The torque wrench cannot be twisted: it may be due to damage to the internal gears of the wrench or insufficient lubrication. The solution is to disassemble the wrench, clean and lubricate the gear, or replace the damaged gear.

2. 扭剪扳手扭力不准确：可能是扳手内部的弹簧松弛或者损坏。方法是拆开扳手，检查弹簧的状态，如果松弛或者损坏，需要更换弹簧。

2. Inaccurate torque of the torque wrench: It may be due to loose or damaged springs inside the wrench. The solution is to open the wrench and check the condition of the spring. If it is loose or damaged, the spring needs to be replaced.

3. 扭剪扳手扭力过大或过小：可能是扳手内部的调节装置失效或者损坏。方法是拆开扳手，检查调节装置的状态，如果失效或者损坏，需要更换调节装置。

3. The torque of the shear wrench is too large or too small: it may be due to the failure or damage of the internal adjustment device of the wrench. The solution is to open the wrench and check the condition of the adjustment device. If it fails or is damaged, the adjustment device needs to be replaced.

4. 扭剪扳手手柄松动：可能是手柄内部的螺纹松动或者损坏。方法是拆开手柄，检查螺纹的状态，如果松动或者损坏，需要更换螺纹。

4. Loose handle of torsion wrench: It may be due to loose or damaged threads inside the handle. The solution is to disassemble the handle and check the condition of the thread. If it is loose or damaged, the thread needs to be replaced.

5. 扭剪扳手外观损坏：可能是扳手外壳受到撞击或者磨损。方法是更换外壳或者进行修补。

5. Appearance damage of the torsion wrench: It may be due to impact or wear on the wrench housing. The solution is to replace the casing or repair it.