Pneumatic booster pump if not normal work, there are several possible:

1.控制阀损坏,导致换向阀不能正常工作。

1 control valve damage, leading to the valve can not work.

2.驱动活塞密封伯磨损,导致活塞上侧和下侧串气。

2 piston seal wear ", causing the piston upper and lower leakage.

3.两活塞连接处损坏,开口销脱落,两活塞杆错位,导致活塞杆不能移动。

3 the two piston joint damage, split off, two piston rod dislocation, causes the piston rod can not move.

4.换向阀太脏,或它的密封件损坏,导致它不能动作。

4 reversing valve is too dirty, or its seal damage, leading to it can not act.
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