HELI CQD16X1, Operation & Service Manual

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18.Dust-proof ring 65x73x5/6.3 19. Separation blade 75x65x3
20. 605 sealing ring for axle 65x75x6 21. O ring 75x3.1 22. Lock screw M8x6
23. Guide sleeve 24. O ring D70X3.1 25. Shim 70x75x1.25 26. Steel ball 5
27. Piston 28. Lock screw M4x6 29. Sleeve
30. Combined sealing ring 75x59.5x6.3 31. Supporting ring 75x70x20
There is anti-bursting valve at the bottom of front and rear lifting cylinder. The
pipeline anti-bursting valve is used to protect the fork bracket and goods from falling
caused by pipeline bursting so as to avoid damage of goods and persons. It is installed
on the cylinder bottom. The working principle is that the circuits from A chamber to B
chamber and from B chamber to A chamber are unlocked normally, when the pipeline
bursts, a great pressure difference is produced between A chamber and B chamber,
then the shutter 4 locks the flowing hole of the valve body 1 to cut the oil circuit from
the cylinder to the outside to ensure the safety of goods and person.
Figure 4-8-6 Pipeline anti-bursting valve structure
1. Valve body 2. Guide shaft 3. Spring 4.Seperation blade
4.8.17.2 Air bleeding of lifting cylinder

Front lifting cylinder
1) Turn on the air bleeding screw of front lifting cylinder slowly. See item 15 in
figure 2. Let the air in the oil cylinder out until there is continuous hydraulic oil
flowing out of air bleeding screw.
2) Tighten the air bleeding screw.