HELI G3 Series, Operation & Service Manual

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through the tilting cylinder. Under the action of the tilting cylinder, it can tilt forward and
backward, with a forward tilt of 6 degrees and a backward tilt of 8 degrees. The channel of
outer mast is C type, and one pair of rollers is installed in its upper end; the channel of inner
mast is H type, and its lower part is installed with a pair of rollers. The inner mast keeps the
relative position of the inner mast and the outer mast throughout the movement process by
rolling the main and side rollers.
Take care when maintaining the upper main roller and the side roller of the outer mast.
6.3 Fork carrier
A roller shaft is welded on fork carrier, and the main roller rolling along the inner
surface of the inner mast and its elastic retaining ring are mounted on the rolling shaft. The
side rollers rolling along the inner side of the inner mast are fixed by bolts and adjusted
through shim. The longitudinal load is borne by the main roller. When the fork rises to the
maximum lifting height, the main roller mounted on the top of the mast is exposed. At this
time, the combined roller bears both lateral load and longitudinal load. Rigidity and strength
as well as smooth operation shall be taken into consideration when designing the mast and
fork carrier.
In addition, the upper and lower crossbeams of the fork carrier are made of high strength
steel, and integrated type of fork carrier ensures its durability. The installation grade meets
the ISO standard. The backrest and removable attachment can be installed on the fork carrier
to meet the needs of different customers. The two forks are installed on the fork carrier, and
the spacing between the two forks can be adjusted manually.
6.4 Repair and maintenance
6.4.1 Adjusting of shims at the lifting cylinder’s head