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The specific regulating method is shown as below:
When adjusting according to the direction indicated by the arrow in Fig.4-13 (i.e. clockwise facing the pressure
adjusting nut), the pressure increases, otherwise the pressure decreases. The pressure of master safety valve
shall be adjusted by use of the hydraulic pressure gauge. The pressure of steering gear is regulated through the
adjustment of steering gear and the pressure of safety valve regulated through the adjustment of nut.
4.4.3 Lifting cylinder (Fig.4-14)
Fig.4-14 Lifting cylinder
The lifting cylinder is the oil cylinder of single acting piston and composed of the cylinder block, piston rod,
piston and cylinder head etc., It is fixed behind the U-steel of outer mast. The bottom of oil cylinder is fixed by
use of pin and bolt on the outer mast. The oil cylinder piston rod is connected with the walking beam. The
stroke and lifting of twin-cylinder piston are synchronized, which is achieved by the adjusting bolt on the
walking beam. On the oil port at the bottom of the right lifting cylinder, a shut-off valve is fitted. When the HP
rubber hose is suddenly blown up, the cargo will drop sharply, producing the great difference in pressure,
enabling the movement of inner slide valve to clog the oil port, and only few amount of oil to pass through the
small hole at the end of the sliding valve, so that the pallet fork slowly lowers to prevent from the accident.
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General