Hydraulics
9803/7130 Issue 1
5 - 2 5 - 2
Circuit Descriptions
Section E Section E
Loader Valve Neutral Circuit
Component Key:
T Tank Port
X Parallel gallery
1A Pump Inlet
1B High Pressure Carry Over Port
3 Loader Valve Block
3A Shovel Ram Spool
3B LIft Ram Spool
3C Auxiliary Spool
3D Main Relief Valve
The loader valve is mounted on the chassis frame, right
hand side (when viewed from the rear).
It includes the shovel ram spool 3A, lift ram spool 3B and
auxiliary spool 3C. Linkage rods connect the spool ends to
the control levers.
Oil from the pump enters the loader valve at 1A. When all
the spools are in neutral as shown, the oil passes around the
waisted central portions of the spools and flows on to feed
the excavator valve via high pressure carry over line 1B.
Oil also fills the parallel gallery X.
The exhaust gallery is connected to the tank return line via
port T.
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