10 - 6
Operation (cont’d)
Pilot Relief Valve
Pilot pressure is controlled by the pilot relief valve setting.
Pressure can be varied using adjuster
56-6
which holds
poppet
56-2
against seat
56-3
by means of spring
56-5
. If
the pressure exceeds the set value, the poppet lifts to vent
excess
Pp
pressure to tank.
Solenoid Proportional Pressure Control (SPPC) Valve
The function of the SPPC valve is to provide a means of
varying the horsepower settings of the two pumps according
to the operating mode selected. Each mode selection
causes an electrical signal
F
to be applied to the valve
solenoid. The signal current level is dependent on the mode
selected. The solenoid converts the electrical signal into a
thrust from plunger
E
.
When solenoid
58
is energised, the thrust of plunger
E
moves spool
103
to the left to connect input port
B
(at pilot
pump
Pp
pressure) to output port
C
. The output pressure at
port
C
is routed to chamber
A
where it acts as a back
pressure to oppose the thrust of plunger
E
. High back
pressure causes spool
103
to move so that output port
C
connects to drain port
D
lowering the output pressure and
hence the back pressure. The result is a level output
(horsepower signal) pressure which is proportional to
solenoid plunger thrust and determined by the proportion of
input pressure (at port
B
) connected to port
C
via spool
103
.
Section E
Hydraulics
9803/6410
Section E
10 - 6
Issue 1
Hydraulic Pump/Regulator
Содержание JS130
Страница 39: ...3 3 Section 3 Routine Maintenance 9803 6410 Section 3 3 3 Issue 1 Greasing continued Excavator End...
Страница 65: ...Section 3 Section 3 9803 6410 Issue 1 9 1 9 1 Routine Maintenance Component Location Diagram...
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Страница 119: ...3 1 Section C Electrics 9803 6410 Section C 3 1 Issue 1 Layout Operator s Cab...
Страница 142: ...5 3 Section C Electrics 9803 6410 Section C 5 3 Issue 1 Pump Control FLOW CHART...
Страница 145: ...5 6 Section C Electrics 9803 6410 Section C 5 6 Issue 1 Pump Control Cushioned Boom Starting continued Flow Chart...
Страница 148: ...5 9 Section C Electrics 9803 6410 Section C 5 9 Issue 1 Pump Control Pressure Increasing System continued Flow Chart...
Страница 155: ...5 16 Section C Electrics 9803 6410 Section C 5 16 Issue 1 Pump Control Power Supply Cut Delay Flow Chart...
Страница 159: ...5 20 Section C Electrics 9803 6410 Section C 5 20 Issue 1 Pump Control Swing brake Swing lock continued Flow Chart...
Страница 160: ...5 21 Section C Electrics 9803 6410 Section C 5 21 Issue 1 Pump Control Lever Lock Circuit Diagram Time Chart...
Страница 161: ...5 22 Section C Electrics 9803 6410 Section C 5 22 Issue 1 Pump Control Lever Lock continued Flow Chart...
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Страница 210: ...3 4 Section E Hydraulics 9803 6410 Section E 3 4 Issue 2 Schematics Shuttle Block...
Страница 211: ...Section E Section E Hydraulics 9803 6410 Issue 2 3 5 3 5 Schematics Pilot Control Line Hose Connection Diagram JS03540...
Страница 212: ...Section E Section E Hydraulics 9803 6410 Issue 1 3 6 3 6 Schematics Pilot Control Line Hose Connection Diagram JS03540...
Страница 234: ...14 1 Section E Hydraulics 9803 6410 Section E 14 1 Issue 1 JS00010 Hydraulic Pump Regulator Dismantling and Assembly...
Страница 278: ...32 2 Hydraulic Circuit Diagram Section E Hydraulics 9803 6410 Section E 32 2 Issue 1 Control Valve JS01700...
Страница 279: ...33 1 Neutral Circuit Section E Hydraulics 9803 6410 Section E 33 1 Issue 1 Control Valve JS01610...
Страница 284: ...33 6 Boom Raise BM Operation Section E Hydraulics 9803 6410 Section E 33 6 Issue 1 Control Valve L...
Страница 287: ...33 9 Slew Operation SW Priority Circuit Section E Hydraulics 9803 6410 Section E 33 9 Issue 1 Control Valve JS01770...
Страница 293: ...Hydraulics 9803 6410 Issue 1 34 3 34 3 Section E Section E Control Valve JS01820 Dismantling and Assembly cont d...
Страница 532: ...Contents Page No Technical Data 1 1 i Engine 9803 6410 i Issue 1 Section K Section K...