Hydraulic Operation And Schematics - jcb JS300 Service Manual

Introduction
This section identifies the main system components and
their locations.
A simple description of operation is given for each of the
main systems as follows:
K Hydraulic Pump Regulation ( T E-25)
–
K Neutral Circuit ( T E-27)
–
K Linear Travel Valve Spools Operation ( T E-29)
–
K Travel - Middle Speed ( T E-31)
–
K Boom Up ( T E-33)
–
K Boom Down ( T E-35)
–
K Dipper Out ( T E-37)
–
K Dipper In ( T E-39)
–
K Bucket Opening ( T E-41)
–
K Bucket Close ( T E-43)
–
K Priority Valves ( T E-45)
–
K Swing Circuit ( T E-47)
–
K 100% Swing Lock ( T E-49)
–
K Auxiliary Circuit ( T E-51)
–
K Merged Flow ( T E-53)
–
K Hammer Circuit ( T E-55)
–
OIl from pump section 3A
Oil at servo pressure
E-24

Hydraulic Operation and Schematics

Table 16. Hydraulic Connections Colour Key
OIl from pump section 3B
Oil suction line from the tank
to the pump sections
9813/5100-1
Section E - Hydraulics
Hydraulic Operation and Schematics
The schematic diagrams show overview of the system. For
machine specific schematics refer to Systems and
K Related Topics ( T E-18)
Schematics.
The illustration shows a typical installation. Some machine
variants have a different, but similar installation.
For system specifications and pressures refer to the
applicable hydraulic system
K Specifications ( T E-19)
Hydraulic System
topic specifications.
Return to tank
E-24