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10. Fold up the booms and proceed to the next field,
and start the process all over again.
IMPORTANT
When the boom wheels are contacting the ground,
the GFS must be turned on and working on all
sections, or damage to boom components or GFS
gauge wheels may result.
For operation in solid seeded crops above 8 high, the
GFS wheel might be raised to high position and boom
operated with GFS off.
When there is no likelihood of having crop less than 8
high for a period of time, boom wheels may be
removed.
4.1 OPEN CENTER OPERATION(option)
Ask your dealer or Ag Shield to help you find out if
your tractor has an open or closed center hydraulic
system.
If open center option is installed, the red LED on in cab
control near OC should light each time any hydraulic
function is used, whether it is the GFS or a manual
switch operation. A red LED should light at the rear of
machine on the control box as shown in
.
Each time either of the GFS gauge wheels rises higher
above the level of the sprayer chassis, the red light
under OC on the in cab box should light indicating that
the open center valve is closing and the boom
hydraulics are pulling the excessive weight off of the
boom wheel.
Each time the main pressure setting is changed,
the open center pressure must also be changed.
To set the open center switch pressure, follow the
steps marked open center in section 4.2.
4.2 GFS Hydraulic Pressure Adjustments
WARNING
pressure adjustments or doing
pressure tests, the boom could
start to go up and not stop until cylinder
reaches maximum stroke. Be sure that
there are no overhead obstructions,
particularly power lines, before making
any pressure adjustments.
***Before any pressure adjustments are made do the
following tests:
Test 1, Turn the GFS system master switch OFF.
Raise the boom wheels clear of the ground. Read the
pressure on the GFS pressure gauge. e.g. could be
22
When making
1600 psi of boom weight hanging on the cylinder
reading on the gauge. Record the pressure reading
If your unit is equipped with an open center switch, it
must be adjusted at this time. Start motor and engage
hydraulic pressure to the boom system. Remove the
black cap in the bottom of the open center pressure
switch. Turn the 3/32 Allen head screw clockwise until
the red LED comes on at either the control switch in
cab or the GFS switch box at the boom. The light
indicates that the open center valve is closed and
additional hydraulic oil can be supplied to lift the
booms. Continue to test 2 below.
Test 2, With motor running, hydraulic pressure to
boom engaged, and GFS turned ON, tap both boom
control switches DOWN. Both L and R green lights
should be lit on the cab box. GFS gauge wheels will
drop to the ground. Read the GFS pressure gauge,
e.g. could be 1300 psi of pressure supplied to the
cylinder. Record the pressure reading
Compare the 2 pressure readings found in test 1
versus test 2.
It is normal to have a 325 psi greater reading in test 1
than test 2.
A difference of 250 psi would reduce pressure on the
wheel and extend the life of boom components.
A difference of 350 psi should be largest allowable,
more would be placing excessive weight on GFS
gauge wheel. Your reading will vary depending upon
the weight of your boom, and the size of your shoulder
cylinders, but the difference between the 2 readings is
the important factor.
Call 1-800-561-0132 if system appears to need a
larger spread than 350 psi to work satisfactorily.
To adjust pressure upwards turn the GFS valve screw
clockwise, use a small increment of 1/12 of a turn at a
time, with or without the hydraulic pressure applied to
get approximately 75 psi change up or down. Tighten
the lock nut on the adjusting thread each time an
adjustment is made.
On open center equipped units, final adjust the open
center enable pressure by turning the 3/32 Allen head
screw on the pressure switch counterclockwise until
the red light goes off. Then turn 1/12 turn clockwise
again to turn on the light setting very slightly (100psi
less than) the GFS pressure setting.
4.3 GFS Tire Pressures
Tire Pressures in the GFS gauge wheels is
maximum 10 psi, but prefer to run at 6 psi to take
advantage of suspension in the tire.
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