OPERATOR'S MANUAL MAINTENANCE

Section E - Hydraulics
Circuit Descriptions
Dipper Out
E-40 E-40
9803/9880-3
Dipper Out
For schematic,
K Fig 13. ( T E-41)
Servo pressure from the hand controller 50 is sent to port
A5 of the shuttle valve 46 and is distributed to:
1 Port C9 to activate the auto mode pressure switch 43.
2 Port B5 to port B of the cushion valve 49, through the
valve leaving at port D. The signal is sent to port Pa5
on the Main control valve 14 selecting the dipper.(1)
spool, Dipper (2) spool and the upper pressure
switch.
Flow from pump 2 is available at the dipper (1) spool via
the left hand neutral passage and the linear travel spool via
the parallel working passage. Flow from pump 1 is blocked
at the dipper (2) spool and merges with the flow from pump
2 before the dipper (1) spool.
Exhaust oil from the ram 3 enters the main control valve 14
at port B5 and has a path to tank via the dipper (1) and
dipper (2) spools.