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33 - 7
Boom Raise (BM) Operation (cont’d)
When pilot pressure is applied to port
br1
, by operating the
right hand joystick controller, spool
B
moves to the left
closing off the neutral gallery, allowing oil from pump
P2
to
enter the gallery
J
. Pilot pressure is also applied to port
C
in
the load holding valve
X
. Check valve
D
opens, causing
piston
E
to open poppet valve
F
, connecting passageways
G
and
H
. Because check valve
K
is closed, ports
G
and
L
are shut off. Oil bleeds from check valve
M
through pilot hole
P
to gallery
J
, causing check valve
M
to open allowing oil to
enter the outlet port
BR1
.
Combined flow from both pumps is achieved when pilot
pressure is applied to port
N
in the logic check valve
Y
. Oil
from pump
P2
flows through gallery
T
. When this pressure
falls below the pressure delivered by pump
P1
to port
R
, the
check valve
S
moves to the left against the spring pressure
and allows oil to flow from port
R
into gallery
T
and to the
outlet port
BR1
.
Section E
Hydraulics
9803/6410
Section E
33 - 7
Issue 1
Control Valve
Summary of Contents for JS130
Page 65: ...Section 3 Section 3 9803 6410 Issue 1 9 1 9 1 Routine Maintenance Component Location Diagram...
Page 118: ......
Page 119: ...3 1 Section C Electrics 9803 6410 Section C 3 1 Issue 1 Layout Operator s Cab...
Page 142: ...5 3 Section C Electrics 9803 6410 Section C 5 3 Issue 1 Pump Control FLOW CHART...
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Page 209: ......
Page 210: ...3 4 Section E Hydraulics 9803 6410 Section E 3 4 Issue 2 Schematics Shuttle Block...
Page 532: ...Contents Page No Technical Data 1 1 i Engine 9803 6410 i Issue 1 Section K Section K...