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2.1 2.1 Hydraulic Hydraulic system system working working principleprinciple
Lifting the LoadingLifting the Loading
Press the lifting button of the control lever and the oil pump motor starts. It passed the torquePress the lifting button of the control lever and the oil pump motor starts. It passed the torque
from motor to gear pump through the transmission shaft. The gear pump absorbs the hydraulicfrom motor to gear pump through the transmission shaft. The gear pump absorbs the hydraulic
oil from the fuel tank and passes the oil to the lifting cylinder through non-return valve. Highoil from the fuel tank and passes the oil to the lifting cylinder through non-return valve. High
pressure oil push the piston rod forward which give rise pressure oil push the piston rod forward which give rise to the lifting of to the lifting of forks and the loading.forks and the loading.
Release the lifting button and the oil pump motor stops. The gear pump stops absorbing the oil.Release the lifting button and the oil pump motor stops. The gear pump stops absorbing the oil.
And And the the non-return non-return valve valve is is closed closed which which can can keep keep the the lifting lifting cylinder cylinder and and the the loading loading in in itsits
original lifting position. When the lifting cylinder reaches the end or the truck is over loaded, theoriginal lifting position. When the lifting cylinder reaches the end or the truck is over loaded, the
working pressure is exceeding the safety pressure defaulted in the system, the overflow valveworking pressure is exceeding the safety pressure defaulted in the system, the overflow valve
will be open and the will be open and the hydraulic oil returns back to the fuel hydraulic oil returns back to the fuel tank.tank.
Lowering the LoadingLowering the Loading
Press the Press the lowering button of lowering button of the control the control lever and lever and the oil the oil pump motor pump motor starts. starts. When the When the closedclosed
electromagnetic valve is applied with electricity, the hydraulic oil in the lifting cylinder will flowelectromagnetic valve is applied with electricity, the hydraulic oil in the lifting cylinder will flow
back to the fuel tank due to gravity. Both the cylinder and the loading start to lower. Governorback to the fuel tank due to gravity. Both the cylinder and the loading start to lower. Governor
valve is used to prevent the trucks and loadings from being damaged due to the rapid loweringvalve is used to prevent the trucks and loadings from being damaged due to the rapid lowering
speed.speed.
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