English-53
DESIGN AND FUNCTION
Lifting and lowering
Lifting increases the pressure from the gear pump to max. 12 MPa (120 bar) depending on the weight of the
work equipment. This pressure flows to the valve block for working hydraulics and on to the lifting cylinder.
Both valves (2+4) are opened to let through the flow to the lifting cylinder. At the same time, the valve (2) is
closed to flow back to the hydraulic pump for the drive system. The valve (3) is closed. The pressure on the
lifting cylinder’s piston side increases, the piston moves and pushes back the oil on the piston side, which is
then piped back to the oil cooler and tank. The restrictor at port C limits lifting and lowering speed.
During lowering, the circuit functions as in cutting position without weight transfer. Valve 4 closes and valve
3 opens.
Holding position is equal to transport position.
8043-230
Circuit diagram Lifting
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