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3.3 Universal joint shaft (very important)
When attachi
ng
the machine for the first ti
me
to
the three-
po
int linkage of the tractor do
not attach the p.t.o.-shaft to the tractor. Instead
pu
ll
the front half of the p.t.o.-shaft out
fir
st,
attach
it
to the
sp
li
ned p.t.o.-shaft of the tractor,
li
ft
the machi
ne
into working posi-
t
io
n and check the overl
ap
of the p.t.o.-shaft by holding both free ends side
by
side and
simultaneously lower the hydraulic
to
the floor. A minimum overlap of
60
mm
(2
1
/
2")
should
be
maintained
in
al
l
li
fting positions of the machine.
On
the other hand the
in
ner
and outer tube must under
no
circumstances touch the univesal joint
on
the end of the
tubes (F
ig
. 1
).
If
the p.t.o.-shaft-halves a
re
too long they have
to
be
shortened by the
same amount on either side including the protective tubes). App
ly
grease
to
the inner
shaft!
3.4 Hydraulic circuit (principle of function)
As
illustrated
in
Fig. 2 (standard) and Fig. 3 (JET with optional control chest) the JET is
supplied with oil from from the tractor via the pipeline
P.
The maximum oil requirement
is
about 30
1/min.
With the aid of the three-way-regulating valve (F
ig
.
2.1
and 3.1) and
the setting motor this flow of oil
is
variably divided. Accordingly the speed of the oil motor
(Fig. 2.2 and 3.2) and thus of the metering rollers (Fig. 2.3 and 3.3)
is
changed. The
amount of the oil which
is
not needed for the oil motor
is
guided into the return-flow hose
N (Fig. 2.4).
If
however, the machine
is
additionally equipped with a control chest
(Fig. 3.4) this amount of oil
is
available for hydraulic "side-functions" at the control chest.
If
no
oil
is
needed at the control chest for the hydraulic control,
it
shall
be
returned
to
the
tractor through the return flow hose N together with the oil returned from the oil motor.
The hose R brings the oil coming from the control chest and that from the hydraulic rams
directly back into the tractor tank.
In
the hose R the oil must
be
able to return without
pressure. By the use of the solenoid control chest many tractor-spool control valves are
saved and the simultaeous operation of of oil motor and hydraulical functions remains
always possible without altering the speed of the oil motor (and of the metering units).
9