7.1 General Description
7.1 General Description
The
The
hyd
hyd
rau
rau
lic
lic
sys
sys
tem
tem
mai
mai
nly
nly
con
con
sis
sis
ts
ts
of
of
mai
mai
n
n
pum
pum
p,c
p,c
ont
ont
rol
rol
val
val
ve,
ve,
hig
hig
h
h
&
&
low
low
pressure oil pipes and joints.The main pump is a gear type and installed on the top of the
pressure oil pipes and joints.The main pump is a gear type and installed on the top of the
transmission.This pump is fitted to a gear to which the
transmission.This pump is fitted to a gear to which the
charging pump is also fitted.As the
charging pump is also fitted.As the
engine runs,the main pump is driven to draw up oil from the tank and send it to the control
engine runs,the main pump is driven to draw up oil from the tank and send it to the control
valve.The control valve,provided with a relief valve to keep
valve.The control valve,provided with a relief valve to keep
the circuit pressure within the
the circuit pressure within the
specified one,controls the cylinders by changing over the oil passages inside the valve
specified one,controls the cylinders by changing over the oil passages inside the valve
body with the spools.
body with the spools.
7.2 Main Pump
7.2 Main Pump
The main pump consists primarily of a
The main pump consists primarily of a
drive gear,driven gear and pump body which
drive gear,driven gear and pump body which
contains the two gears and other components.The drive gear is in mesh with the driven
contains the two gears and other components.The drive gear is in mesh with the driven
gear.
gear.
7.3 Control valve(See fig.7-1)
7.3 Control valve(See fig.7-1)
Fig.7.1 Control valve
Fig.7.1 Control valve
The control valve is a sectional type consisting of the inlet section,plunger section
The control valve is a sectional type consisting of the inlet section,plunger section
and outlet section which are assemble
and outlet section which are assemble
d with three bolts.
d with three bolts.
At the inlet section is a cartridge type relief valve to set the oil pressure in the
At the inlet section is a cartridge type relief valve to set the oil pressure in the
circuit.The plunger section controls the hydraulic cylinders by changing over the flow of
circuit.The plunger section controls the hydraulic cylinders by changing over the flow of
oil from the relief
oil from the relief
valve with plungers.The tilt cylinder plunger section is
valve with plungers.The tilt cylinder plunger section is
equipped with a
equipped with a
tilt lock valve.Oil returned from the cylinders is returned to the tank through the outlet
tilt lock valve.Oil returned from the cylinders is returned to the tank through the outlet
Main relief valve
Main relief valve
To pump
To pump
Flow-divider
Flow-divider
Turning Relief valve
Turning Relief valve
Lift slide valve
Lift slide valve
Tilt slide valve
Tilt slide valve
Outlet
Outlet
Tank port
Tank port
-87-
-87-
https://www.besttruckmanuals.com/