------------------------------SECTION
A
OM213
27.Single
and
Double Spool Remote Control Valves
1.
Single-spool valve
2. Double-spool valve
3.
'Quick-drop' valve
4. Float valve
To
facilitate the operation of remote
cylinders,
op-
tional
remote
control valves are
available
for
your
tractor.
The standard version
is
available
with
a
single
or
double
spool
feature whilst
up
to
four
de
luxe
re-
mote
control valves
may
be
installed.
See
the
fol-
lowing
text headed
STANDARD
REMOTE
CONTROL
VALVES
or
DELUXE
REMOTE
CONTROL
VAL
YES,
as
appropriate.
STANDARD
REMOTE
CONTROL
VALVES
Single or double-spool remote control
valves
may
be
installed
on
the
hydraulic top
cover,
replacing
the
accessory cover or
A.S.C.
valve.
See
Figure
27.
The
remote control valves
are
connected
by
pipework
to
quick-release couplers
located
at
the
rear of
the
tractor. Single-spool
valves
have
the
couplers
to
the right of
the
hydraulic lift
rocker.
Double-spool valves
have
couplers either
side
of
the
rocker
as
shown
in
Figure
28.
28.Standard Remote Control Valve Couplers
1.
Lift coupler (right-hand spool valve)
2.
Drop coupler (right-hand spool valve)
3. Lift coupler (left-hand spool valve)
4.
Drop
coupler (left-hand spool valve)
Single-acting or doubling-acting remote cylin-
ders
may
be
operated
provided
the float
and
'quick-drop'
valves
are
correctly set
and
the
cyl-
inders
are
connected
to
the
appropriate coupler(s).
See
Figures
27,
28
and
the
remote
control
valve
application
chart
on
the
next
page.
Single-spool
valves
and
the
in-board (left-hand)
spool
of double-spool
valves
have
a 'quick-drop•
facility.
This
feature
eliminates system back
pres-
sure
and
will
assure
the
gravity
return of a lightly
loaded
single-acting cylinder,
as
used on
imple-
ments
such
as
tipping
trailers
and
semi-mounted,
reversible
plows.
To close
the
quick-drop
valve,
tum
the
hexagon
head
adjusting
screw
clockwise.
To
open
the
valve,
tum
the
screw
counter-clock·
wise.
See
Figure
27.
NOTE:
If
it
is
required
to
operate one single-act-
ing
cylinder
with
a double-spool valve installed,
always
use
the
inboard (left-hand) spool.
The
outboard
(right-hand)
spool
of
the
double--
spool
valve
has
a float
valve.
A partially open
float
valve
will
allow
an
implement
to
'float' or
follow
the
ground
contour,
a
feature
that is useful
for
grading
operations.
To
open
the
float
valve,
turn
25
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