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2.1 Hydraulic system working principle
Brief introduction to the working principle of hydraulic system：
When press the lifting button of the control handle, lifting motor works, drive the hydraulic pump
through coupling device, hydraulic oil enters lifting cylinder through one-way valve, and forks lift.
When press the lowering button of the control handle, lifting motor does not rotate, the solenoid
valve open by this time, hydraulic oil in the lifting cylinder through solenoid valve and governor
valve returns to the oil tank, and the forks drop.
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