Great Plains PFH-20 Operator Manual - Manual (Page 20)

18
Section 3 Troubleshooting
PH-15, PH-20, PFH-15 and PFH-20 Coulter Command System 148-384M 6/21/2004
Great Plains Mfg., Inc.
Problem Possible Cause Solution
Coulters move up when the
down switch is operated and
down when the up switch is
operated. Not supplying oil to the "P" port of the
hydraulic valve. Reverse the remote hydraulic lever in the
tractor.
Solenoids wired backward or hoses from
port "A" and port "B" reversed at the
hydraulic valve. Unplug solenoids and swap wire leads to
them.
Automatic Coulter depth con-
trol stops adjusting coulter
depth TONGUE HYDRAULICS switch bumped to
MANUAL mode. Flip TONGUE HYDRAULICS switch back to
AUTO mode
Tractor remote hydraulic lever not locked for
constant oil supply to valve. Lock Tractor remote hydraulic lever with
rubber tarp strap or other means.
System variables out of adjustment Turn power switch OFF and back on again
so system variables can reset. Then flip the
AUTO-MANUAL switch to AUTO and
resume operation.
Turning the COULTER DEPTH
knob does not set coulters
deep enough. If the tongue cylinder runs completely
retracted, the tractor drawbar is to high. Use a straight drawbar or one which
sweeps down.
If in extremely hard conditions with the
machine standing the tongue cylinder
pulses but does not retract. This is perfectly normal. The cylinder will
not penetrate the coulters on a stationary
machine in hard conditions. Pull forward
and check coulter depth on a moving
machine.
If the COULTER DEPTH knob is turned to
"A" and the tongue cylinder will not com-
pletely retract when moving through the
field then the internal sensor box linkage is
not set correctly. Adjust the sensor box internal linkage. See
"Sensor Box Adjustments" on page 13.
If the sensor box linkage is properly
adjusted and tongue cylinder constantly
pulses while moving through the field but
the front tongue cylinder will not retract, you
do not have enough system weight. Add fertilizer or water to liquid tanks. Add
tool bar weight brackets to coulter tool bars.
The hydraulic valve con-
stantly pulses when you are
stopped to refill or adjust
something. Hard soil conditions are hindering coulter
penetration while stopped. Flip TONGUE HYDRAULICS switch to
MANUAL mode while you are stopped or
turn coulter command power OFF. Pulsing
does not hurt the valve, but
can be annoy-
ing.
Turning the COULTER DEPTH
switch to "E" does not allow
the coulters to run shallow
enough. The internal sensor box linkage is not set
correctly. Adjust the sensor box internal linkage. See
"Sensor Box Adjustments" on page 13.
Depth sensing gauge wheel
not lifting off the ground when
Precision Hitch is raised. Coulter Command power is OFF or 12 volt
power has been interrupted.
Coulter Command must be connected and
the power must be ON for the depth sens-
ing gauge wheel to raise when the Preci-
sion Hitch is raised. The depth sensing
gauge wheel should raise with the transport
lift circuit with Coulter Command in either
the AUTO or MANUAL mode is long as the
power is ON.
The lift switch has become disconnected or
the lift switch cam on the rockshaft is not
properly adjusted. Adjust the lift switch cam. See "Lift Switch"
under Section 2 "Operating Instructions"
on Page 16.Check cable connections on lift
switch leads.
Section 3
Troubleshooting