ATLET A-Ergo, Service Manual

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ATLET SERVICE MANUAL A-ERGO ATLET SERVICE MANUAL A-ERGO
H Hy yd drra au ulliic c s sy ys stte em / m / D De es siig gn n a an nd d ffu un nc cttiio on n / / G Ge en ne erra all 8 8..1 1
Edition 2009A Edition 2009A
8 8 Hydraulic Hydraulic system system
Design and function Design and function
General General
Lift Lift
The driver operates a lift lever or alternatively a proportional electric lever that actuates The driver operates a lift lever or alternatively a proportional electric lever that actuates
a microswitch, which in turn actuates the lift
a microswitch, which in turn actuates the lift motor by means of a contactor motor by means of a contactor. The motor . The motor
drives the built-in hydraulic pump, which pumps hydraulic oil to the lift drives the built-in hydraulic pump, which pumps hydraulic oil to the lift cylinders. The cylinders. The
lift lever/electric lever also controls a control value, which controls the oil flow t lift lever/electric lever also controls a control value, which controls the oil flow to the o the
cylinder performing the work. cylinder performing the work.
In the control valve there is a In the control valve there is a pressure limiting valve, which limits the maximum pressure limiting valve, which limits the maximum
hydraulic oil pressure. The pressure of the hydraulic oil is hydraulic oil pressure. The pressure of the hydraulic oil is built up when the cylinder goes built up when the cylinder goes
towards its end position. A towards its end position. A pressure limiting valve opens when the pressure limiting valve opens when the maximum system maximum system
pressure has been reached , which leads the oil from the pump back to the tank. The pressure has been reached , which leads the oil from the pump back to the tank. The
opening pressure of the pressure limiting valve is set at the factory so that the
opening pressure of the pressure limiting valve is set at the factory so that the machine machine
will be able to do will be able to do the work it is designed for. the work it is designed for.
Warning! Warning!
The pressure limiting valve must only be adjusted by authorised and trained The pressure limiting valve must only be adjusted by authorised and trained
personnel, since it is es
personnel, since it is essential for the safety of the truck. All sential for the safety of the truck. All work with the hydraulic work with the hydraulic
system should be carried out in a pres system should be carried out in a pressureless state, and in a cle sureless state, and in a clean environment. an environment.
Lower Lower
When the lowering movement is controlled manually by means of a lever there is a When the lowering movement is controlled manually by means of a lever there is a
lowering brake valve
lowering brake valve placed between the control valve a placed between the control valve and the cylinder, which regulates nd the cylinder, which regulates
the lowering speed by restricting the return of the hydraulic oil. the lowering speed by restricting the return of the hydraulic oil.
In those cases where the lifting and lowering movement is regulated by means of an In those cases where the lifting and lowering movement is regulated by means of an
electric control valve the lowering brake valve is integrated in the control valve. When
electric control valve the lowering brake valve is integrated in the control valve. When
the lowering movement is actuated the oil from the cylinder is led
the lowering movement is actuated the oil from the cylinder is led through the control through the control
valve back to the tank when the cylinder is retracted by the weight of valve back to the tank when the cylinder is retracted by the weight of the fork carriage. the fork carriage.
On certain cylinders there is also a hose rupture valve, which provides protection from On certain cylinders there is also a hose rupture valve, which provides protection from
accidents during the uncontrolled discharge of oil.
accidents during the uncontrolled discharge of oil.
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