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8
HYDRAU
Lie
SYSTEM
II
Hydraulic System
The
hydraulic
system
of
these
tractors
are
composed
of
a hydraulic pump, hydraulic block type
outlet,
control valve, hydraulic cylinder, hydraulic oil
filter
and
other
components.
This system
has
the
following
functions.
1.
Position control
of
the
rear implement connected
to
the
3-point hitch.
2.
Hydraulic
power
take
off
from
the
hydraulic block
type
outlet
to
operate the implements
such
as
a
front
loader,
front
blade and etc.
[2] HYDRAULIC PUMP
B1700·B21 00·B2400 WSM, 11772
Oil
is
supplied by a hydraulic pump connected
to
the engine. When
an
engine
is
started, a hydraulic
pump starts running,
sucks
oil from a transmission
case.
The
hydraulic pump forces
out
the
oil
to
power
steering,
hydraulic
block
type
outlet,
control valve, hydraulic cylinder and
hydrostatic
transmission (only
for
HST).
Displacement
Engine speed
Condition
22.0.D/min.
13.2to13.7MPa
5.8
U.S.GPM
At
2600 rpm
135
to
140 kg/cm
2
4.8Imp.GPM
1920
to
1991
psi
The
hydraulic pump
is
composed
of
the casing (1),
cover (3), side plate (5), and
two
spur gears (drive
gear
(4)
and driven gear (2»
that
are in mesh.
Hydraulic pump
is
driven by the fuel camshaft.
Maximum displacement
is
as
follows.
B177F805
4
5
(1) Casing
(2) Driven Gear
(3) Cover
(4) Drive Gear
(5)
Side
Plate
[3] FLOW PRIORITY VALVE
The
flow
priority
valve
is
a
flow
devider
that
devides
the
flow
from
single
hydraulic
source
(hydraulic pump)
to
actuates
two
circuits
(position
control
circuit
and
power
steering
circuit)
simultaneously.
This
valve feeds fixedly controlled
flow
(5
il
min,
1.3
U.S.
GPM,
1.1
Imp.
GPM)
to
the
PF
port
with
priority
and
excessive
flow
to
the
EF
port.
1
B177F806
t
P Port
3
(1) Spring
(2) Spool
(3)
Valve Body
E8-M3
219


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