Operation
In the Soft State
When lever is in neutral (Refer to Fig. 1).
a.
The hot oil separated from the oil cooler line enters
the
R
port of the cushion valve.
b.
It flows through the reverse notch spool interior and
through passages e and f.
Then, after flowing through passages e and f, it flows
through the outer periphery of the respective cushion
spools, returning to the hydraulic oil tank through the
T
port of the cushion valve.
During Dipper Closing Operation
a.
Pilot pressure enters the
A
port of the cushion
valve from the remote control valve. Because this
pilot pressure enters at the left end of the cushion
spool and left end of the reverse notch spool, the
respective spools move to the right.
b.
The pilot pressure inside the cushion spool enters
the g cavity through the spool hole. It then passes
the reverse notch spool outer periphery and enters
the control valve from
C
port.
c.
The return oil (pilot pressure) from the control valve
enters the f cavity after passing from the
D
port to
the outer periphery of the reverse notch spool. It
then passes through the cushion spool outer
periphery and returns to the hydraulic oil tank from
the
T
port.
d.
At this point, the hot oil from
R
port flows through
the h passageway and enters the right end of the
cushion spool because the reverse notch spool is
switched to the right, so the e and f passageways
are closed. The hot oil passes through throttle
c
and
d
and enters the remote control valve from B
port.
(The hot oil warms the remote control valve)
.
55 - 5
Section E
Hydraulics
9803/6400
Section E
55 - 5
Issue 2*
Cushion Valves
Summary of Contents for JS 200 Series
Page 57: ...9 1 Section 3 Routine Maintenance 9803 6400 Section 3 9 1 Issue 2 Component Location Diagram...
Page 113: ......
Page 137: ...5 3 Section C Electrics 9803 6400 Section C 5 3 Issue 2 Pump Control FLOW CHART...
Page 201: ...10 7 Section C Electrics 9803 6400 Section C 10 7 Issue 1 CAPs II Diagnostic system K C...
Page 215: ...Section E Section E Hydraulics 9803 6400 Issue 2 3 2 3 2 Schematics...
Page 217: ...Section E Section E 9803 6400 Issue 2 3 3 3 3 Hydraulics Schematics...
Page 218: ...3 5 Section E Hydraulics 9803 6400 Section E 3 5 Issue 1 Schematics Shuttle Block JS200 JS240...
Page 232: ...10 1 Section E Hydraulics 9803 6400 Section E 10 1 Issue 1 Hydraulic Pump JS200 JS240...
Page 233: ...10 2 Section E Hydraulics 9803 6400 Section E 10 2 Issue 1 Hydraulic Pump JS200 JS240...
Page 234: ...10 3 Section E Hydraulics 9803 6400 Section E 10 3 Issue 1 Hydraulic Pump JS200 JS240...
Page 263: ...30 2 Section E Hydraulics 9803 6400 Section E 30 2 Issue 1 Control Valve JS200 JS240...
Page 264: ...30 3 Section E Hydraulics 9803 6400 Section E 30 3 Issue 1 Control Valve JS200 JS240...
Page 265: ...30 4 Section E Hydraulics 9803 6400 Section E 30 4 Issue 1 Control Valve JS200 JS240...
Page 266: ...30 5 Section E Hydraulics 9803 6400 Section E 30 5 Issue 1 Control Valve JS200 JS240...
Page 267: ...30 6 Section E Hydraulics 9803 6400 Section E 30 6 Issue 1 Control Valve JS200 JS240...
Page 268: ...30 7 Section E Hydraulics 9803 6400 Section E 30 7 Issue 1 Control Valve JS200 JS240...
Page 327: ...51 12 Section E Hydraulics 9803 6400 Section E 51 12 Issue 1 Solenoid Valve 8 spool...
Page 328: ...55 1 Schematic Section E Hydraulics 9803 6400 Section E 55 1 Issue 1 Shuttle Valve...
Page 330: ...55 3 Schematic Section E Hydraulics 9803 6400 Section E 55 3 Issue 1 Cushion Valves...
Page 481: ...7 15 Section F Transmission 9803 6400 Section F 7 15 Issue 2 Motor...
Page 482: ...7 16 Section F Transmission 9803 6400 Section F 7 16 Issue 1 Motor...