S0709476K
Page 4
Pilot Control Valve
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GENERAL DESCRIPTION
When no force is applied to lever (1, Figure 1), return spring (4) positions lever at "NEUTRAL" position.
When lever is moved, plunger (5) is moved, which pushes down return spring (4). At this time, spool (2) is
moved by spring (3). When spool (2) moves down, a groove (6) in spool (2) opens the pilot pressure line to
the line that the lever controls. This allows pilot pressure to flow to the boom or bucket control valve, where
pilot pressure operates the control valve. When the lever is completely moved in one direction, solenoid (7)
energizes electromagnet (8) and holds the lever in the fully moved position.
PILOT VALVE OPERATION
The lever handle is positioned on the right side of the operator’s seat. This single lever controls the
following machine functions: raise boom, lower boom, bucket crowd, and bucket dump. The lever positions
are identified as follows:
F-Float
L-Lower
N-Neutral
R-Raise
H-Hold Position
C-Bucket Crowd
D-Bucket Dump
HR-Holds lever in Raise Mode.
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