DCE80-100E
Technical Handbook
Main valve
Description
35
P.Group 70
TDCE01
04GB
Main valve
The main valve, in its standard version, is actuated via a hydraulic
servo.
The valve consists of the following main components:
z Inlet section
z Control sections, corresponding to the number of functions
ofthe truck
z Combined control and outlet section
The main valve has a separate inlet and outlet section, and also
a separate main pressure limiting valve for the lifting section. The
entire flow from one of the hydraulic pumps goes to this section.
If the lifting function is not actuated, the flow from this pump goes
instead to the cooling circuit of the driving brake or to the reser-
voir.
In addition, any flow from the other pump that is not utilized in the
remaining main hydraulic functions is also supplied. When the lift-
ing function is not actuated, the return flow from this pump goes
to the cooling circuit of the driving brake.
1. Inlet section with main pressure limiting
valve
2. Control section
3. Control/outlet section
4. Inlet/control/outlet section, LIFT
5. Valve block
Main valve
1. Inlet section
1a. Main pressure limiting valve
2. Control section
2a. Control spool
3. Control/outlet section
Main valve
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