Pull the Draft Control Lever back to the neutral position,
i.e., when the three-point linkage neither raises nor
lowers. Set the adjustable stop adjacent to it.
WARNING :
Draft Control is recommended
when operating Auxiliary Services. Never change
from Draft to Position Control while Auxiliary Services
are in use as this may cause sudden unexpected
movement of the implement and could result in injury
to a by-stander.
The A.S.C. valve is operated by means of a knob
installed beneath the front of the seat, Figure 15. With
the A.S.C. valve knob pushed fully in (rearward) oil will
be directed only to the three-point linkage when the Draft
Control lever is raised above the neutral position.
Pull the knob out to the mid-position. This will allow oil
to flow to the three-point linkage and the remote cylinder
together.
WARNING :
Before disconnecting remote
cylinders, ensure the implement is fully lowered
and push the A.S.C. valve knob (where fitted) fully in.
NOTE :
If the implement is removed with the cylinder
extended then oil will be lost from the rear axle housing.
Top up the rear axle, if necessary.
Ensure that oil contained within the remote cylinders is
clean, has not broken down due to long storage and is
of the correct grade. Contaminated oil within the
cylinders will be drawn into the tractor hydraulic system
when the cylinders are in use and may cause early
failure of transmission or hydraulic components.
If the equipment is required to give a positive hold or
where the full power of the tractor hydraulic system is
required to operate a remote cylinder(s), it is
recommended that a remote control valve be used
instead of the Auxiliary Services Control valve.
Operating Remote Cylinders with Remote
Control Valves (where fitted)
To facilitate the operation of remote cylinders, optional
double spool remote control valves are also available
for your tractor.
Double Spool Remote Control Valves are installed on
12
CONTROL, INSTRUMENTS AND OPERATION
Pull the A.S.C. valve knob fully out (forward) to cut off
the oil supply to the three-point linkage and direct the
oil to the remote cylinder only.
NOTE : Hydraulic oil will take the path of least resistance.
Therefore, operation of the three-point linkage will
depend upon the type of auxiliary equipment in use. Do
not operate the tractor with the A.S.C. valve knob pulled
out and no cylinder connected as this will cause the
hydraulic system relief valve to blow continuously and
overheat the oil. This can also occur when a cylinder is
fully extended or retracted and the control is not returned
to neutral.
To extend the remote cylinder, pull the Draft Control
Lever to the rear of the neutral point. When fully
extended, return the Draft Control Lever to the neutral
position to avoid blowing the circuit relief valve. Push
the Draft Control Lever forward of the neutral position
to retract the remote cylinder.
15.
A.S.C. Valve (where fitted)
1. A.S.C. tapping
2. A.S.C. valve knob
the hydraulic top cover, replacing the accessory cover
and are connected by pipework to quick-release
couplers at the rear of the tractor. Single acting or
double acting remote cylinders may be operated
provided the float and ‘quick-drop’ valves are correctly
set and the cylinders are connected to the appropriate
coupler(s), as shown in the remote control valve
application chart.
16.
Double Spool Remote Control Valve
1. Quick-drop valve
2. Float Valve
3. Drop Port
4. Lift Port
