jcb JS300 Service Manual page 698

Section E - Hydraulics
Hydraulic System
Hydraulic Operation and Schematics
Dipper Out
K Fig 8. ( T E-38)
For schematic,
Servo pressure from the hand controller 50 is sent to port
A5 of the shuttle valve 46 and is distributed to:
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 A1 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 2 is blocked
at the dipper (2) spool and merges with the flow from pump
A1 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.
E-37 9813/5100-1 E-37