HELI G Series Operation & Service Manual page 115

Yx-ring and O-ring to prevent oil leakage and keep dust off. Fitted with them, the guide
sleeve is screwed into the cylinder body. When piston moves, oil enters from one port and
exits from the other. The piston rod is furnished with adjusting threads to adjust the
difference between the dip angles. (See Fig. 5-19)
When the tilt lever is pushed forward, the high-pressure oil enters into the cylinder
body from the cylinder tail, moving the piston forward and causing the mast assembly to
tilt forward until 6 degrees. When the tilt lever is pulled backward, high-pressure oil
enters into the cylinder body from the guide sleeve and moves the piston backward,
tilting the mast assembly backward.
(1) Ear ring (2) Dust ring
(5) O-ring (6) Guide sleeve
(10) Cylinder body
5.1.7 Oil tank
Oil suction filter, return oil filter and breather are fixed in the oil returning pipelines
to make sure the cleanness of the supplied oil.
5.1.8 Hydraulic oil circuit
The hydraulic system principle diagram see Fig. 5-20 and the hydraulic oil circuit
see Fig. 5-21.
Fig. 5-19 Tilt cylinder
(3) Snap ring
(7) Bushing
(11) Yx-ring (12) Wearing
(4) Yx-ring
(8) O-ring (9) Piston rod
(13) Piston
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(14) Yx-ring