CONTROLS, INSTRUMENTS
AND
OPERATION--
When
the required implement
working
depth has
been established, set the adjustable stop adjacent
to
the
Draft Control lever
to
locate
the
position
for
repeated
use.
The Draft Control lever may
be
eased sideways
to
bypass
the
adjustable stop,
if
re-
quired.
The adjustable stop
is
reversible after loosening
the central
clamp screw
so
may
be
used
as
a loca-
tion point
for
either
the
Draft or Position Control
levers.
A pressure sensitive feathering valve, installed
within
the
hydraulic system, automatically
regu-
lates the hydraulic oil
flow
to
give
smoother
re-
sponse
to
draft signals
when
using soil engaging
implements.
In
addition,
some
models
have
a
manually operated
flow
control
valve
fitted
to
regulate
the
rate
of
correction
of
the
hydraulic
sys-
tem.
See
Figure 24.
Move
the
flow
control valve knob (where fitted)
counter-clockwise (rearwards)
for
the maximum
rate
of
correction and clockwise (forwards) for the
minimum
correction
rate.
The
rate
of
oil
fl.ow
(correction) of the hydraulic
system
is
infinitely
variable between
these
two
points.
NOTE: Position Control
is
rwt
recommended for
soil engaging implements.
The
flow
control valve
provides fine adjustment
of
hydraulic system sen-
sitivity. However, quite
large
changes
of
sensitiv-
ity may
be
obtained
by
locating
the
pivot pin in a
different hole in
the
lift
rocker.
See
THREE-
POINT UNKAGE in
this
section for correct oper-
ating procedure.
Pull the Draft Conttol lever
to
the
top
of
the
quad-
rant
to
override
the
flow
control
valve
(manual or
automatic)
and
raise
the
implement quickly.
NOTE:
When
grading
and
backfilling with light
equipment, such as a rear blade, it
may
be
desir-
able
to
"block out" upper link tension
loads
to
prevent
the
blade from "diving".
This
is
accom-
22
plished by installing a spacer (available from
your Ford New Holland
dealer) between
the
counter-bore in the Draft Control main-spring
housing
and
the spring seat. See Figure 26. Alter-
natively,
use
the Position Control lever in con-
junction with the Draft Control
lever. See ''Draft
Control Operation with Position Control" on the
next page.
Position Control
Operation
Set
the
required implement height/depth using
the
Position Control lever.
Pull
the
lever back
to
raise
the
implement, push forward
to
lower.
Implement
height/depth is relative to the position
of
the
lever
in
the quadrant.
NOTE:
When
operating in Position Control the
Draft Control lever should be pushed down to
the
bottom
of
the
quadrant.
When
the
required implement worldng height/
depth has been established, set
the
adjustable
stop
adjacent to the Position Control lever
to
locate the
position for repeated use. The lever may
be
eased
sideways
when
it
is required
to
by-pass the adjust-
able
stop.
The
adjust.able
stop is reversible after loosening
the
central clamp screw so
may
also
be
used
when
operating in
Draft
Control
IMPORT
ANT: When transporting equipment
on
the three-point linkage set
the
adjustable stop
w maintain
the
Position Control lever in the raise
position.
This
will prevent accidental movement
of
the lever which could result in attached
e(/11.ip-
ment lowering and becoming damaged or damag-
ing
the
road surface.
When
operating in Position Control it
is
of
no
ad-
vantage
to
restrict the oil
flow
in
the
hydraulic
sys-
tem.
However,
the manual flow
control
valve
(where
fitted) may
be
used
to
reduce
the
rate oflift
of
the
three-point
linkage,
if
required.
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