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55 - 6
Section E
Hydraulics
9803/6400
Section E
55 - 6
Issue 1
Cushion Valves
Operation
(continued)
During Dipper Closed and Stopping
a.
When the pilot pressure from the remote control
valve stops, the reverse notch spool returns to
neutral.
b.
Also, the cushion spool returns to neutral and the
pilot oil returning from the control valve passes
through the throttle
a
and
b
. Because the cushion
spool moves to the left side due to the differential
pressure before and after the throttle, the pilot return
oil is throttled by throttle
a
.
c.
Due to this throttling effect, the spool of the main
control valve slowly returns to neutral.
Normal State
When the cushion switch is switched to the normal position,
the solenoid valve is selected and the pilot pressure (40
kgf/cm
2
) of the gear pump enters the
S
port of the cushion
valve.
All the cushion spools (Boom, dipper - total of 4) are selected
forcibly to the inner side.
Because the cushion spool is forcibly pushed down, the pilot
pressure does not pass through the throttle of the cushion
spool during the dipper closing or stopping operations but
passes through the cushion valve inside.
The hot oil from
R
port returns to the hydraulic oil tank from
the
T
port when the lever is at neutral.
When the lever is being moved, it flows to the remote control
valve.
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...