10 - 3
Section E
9803/8550
Section E
Descriptions
10 - 3
Issue 4
2
Loader Valve
2X
Pressure Test Point
2Y
Pressure Test Point
3
Check Valve (5 bar)
4
Excavator Valve
8
Drive Control Joystick
8a
Joystick Control Spool
8b
Joystick Control Spool
8c
Joystick Control Spool
8d
Joystick Control Spool
8e
Shuttle Valves
9
Pressure Reducing Solenoid Valve
11
Filter By-pass Valve
Key
C
Cooler
F1
Filter
P1
Main Pump
P2
Main Pump
P3
Auxiliary Gear Pump
Pa
Charge Valve
Pb
Pressure Relief Valve
Pc
Pressure Relief Valve
Pd
Pressure Relief Valve
Pe
Pressure Relief Valve
M1
Left Hand Drive Motor
M2
Right Hand Drive Motor
S1
Suction Strainer
T
Tank
T
ransmission Operation - Neutral
With the engine running but no drive selected, oil
from pump
P3
is fed through the loader valve
2,
excavator valve
4
and filter
F1
to main pumps
P1
and
P2
. A small amount of oil flows through the
charge valve
Pa
, enters the pump casing and is
returned via line
z
to tank
T
.
Oil is also fed from pump
P3
to the transmission
servo joystick
8
but, because the joystick is not
operated, the oil is blocked by the spools
8a
,
8b
,
8c
and
8d
and therefore no servo pressure is
applied to operate the swash plates of pumps
P1
and
P2
.
As the pump swash plates are spring loaded to the
neutral position there is no delivery from either
pump and the machine remains stationary.
The motor brakes
x
and
y
are released whenever
the engine is running by oil fed through the
pressure reducing valve
9
. However the machine is
prevented from moving by oil locked up in the
pump/motor circuit.
M1
P1
P2
M2
P3
8
T
S1
C
2X
F1
2Y
11
2
Pa
Pb
Pc
Pd
Pe
8a
8b
8c
8d
8e
xy
9
z
4
3
A242320
*
Содержание 1CX
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