C.ll HYDROSTATIC STEERING
INTRODUCTION
The
hydrostatic
steering system
consist
of
an
oil
reservoir (Item
14,
Fig. C.ll/1),
with
built-in filter, a
hydraulic pump,
with
built-in pressure relief
valve
(6),
hydraulic
cylinder
(5)
and steering unit
(11).
Oil pipes and hoses
connect
the steering
and pump
to
the cylinder.
SPECIFICATIONS
Oil
Reservoir-Serves
the hydraulic system
of
hydrostatic steering only. It
is
located under the
hood
of
the tractor. It has a
filler
plug
with
a
dipstick
and a drain plug at the bottom, as well
as a filter.
Hydraulic
Pump-PD-10-0S
geared type, depen-
dent
to
engine speed, in permanent mesh.
-Maximum
Pressure
....
2537.5 psi (17,000
kPa)
-Working
Pressure
.......
2175 psi (15,000
kPa)
-Capacity@
1000 rpm
.....
2.64 gpm
(10
1/min.)
-Max.
Operating Temp
...........
176°F (80°C}
-Relief
Valve Setting
.....
1450 psi (10,000 kPa)
Hydraulic
Cylinder-Double-acting
type, located
on the
left
side
of
tractor.
Steering
Unit-DANFOSS
OSPB 80.0N 150-0040
type. Connected
directly
to
the steering wheel
shaft.
-Output
@ one full turn
......
4.88 cu.in.
(80
cc)
-Rated
Pressure
.........
1450 psi (10,000
kPa)
-Opening
pressure
of
reverse shock
valve
..................
2320 psi (16,000 kPa)
OPERATION
The steering
unit
consists
of
the rotary-type
distributor
(Item 13, Fig. C.ll/2) and the metering
gear set
(14),
fitted
on the same shaft and steer-
ing wheel-controlled. The
control
from the steer-
ing wheel
is
transmitted
to
the rotary
distributor
spool and
metering
gear set.
The hydraulic
pump
(4)
supplies
the steering
unit
with
oil
under pressure,
through
the union
"P".
The metering gear set
(14)
regulates the
quantity
of
oil
supplied
by the rotary
distributor
to
the
hydraulic ram and insures a turn proportional
to
FIG. C.ll/1 HYDROSTATIC STEERING SYSTEM
1. Steering wheel; 2. Steering
column;
3.
Drag
link;
4.
Joint,
fixed;
5.
Hydraulic
cylinder;
6.
Hydraulic
pump;
7.
Lever; 8. Track arm;
9. Track rod; 10.
Suction
pipe; 11. Steering unit;
12. Delivery pipe; 13. Return path; 14. Oil reser-
voir; 15. Line,
steering
unit;
16. Line, cylinder-
steering
unit;
A. Steering system, standard trac-
tor; B. Steering
system,
DTC
Tractor
the
steering wheel
rotating
angle.
If
the oil
pump
is
inoperative (defective engine
or
pump), the
metering
gear
set
insures
the
operation
of
the
ste~ring
system,
working
as a vane-type
hydraulic
pump
at a speed equal
to
the
number
of
turns
of
the
steering
wheel.
The
safety
valves
for
reverse
shocks
(18),
one for
each branch
of
the system,
is
set at 2320 psi
(16,000 kPa)
to
protect
the
system
against the
shocks
to
which
the
tractor
wheels are exposed.
Hydraulics
· 179
To Next Page
Loading...
Need help?
General
