ATLET SERVICE MANUAL A-ERGO
ATLET SERVICE MANUAL A-ERGO
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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.
https://www.besttruckmanuals.com/
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