User Manual
TM
Model 3000M0188-01
Rev. 6/11 8-5
Troubleshooting
ROW MARKER OPERATION TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE SOLUTION
Same marker always operating. Inadequate oil flow to sequencing
valve. Most commonly associated
with single valve system (lift and
markers on same remote).
TEST: Raise planter and install
transport lockups. Attempt to raise
and lower planter. All hydraulic
oil will be directed to markers.
If markers function properly, the
sequence valve is OK.
Adjust marker speed so planter is up
before marker arm is completely up.
Spool in sequencing valve not
shifting.
Remove spool. Inspect for foreign
material, making sure all ports in
spool are open. Clean and reinstall.
Both markers lowering and only one
raising at a time.
Hoses from cylinders to valve
connected backwards.
Check hosing diagram in manual and
correct.
Both markers lower and raise at
same time
Foreign material under check ball in
sequencing valve.
Remove hose fitting, spring and balls.
Clean. May be desirable to remove
spool and clean as well.
Check ball missing or installed
incorrectly in sequencing valve.
Disassemble and correct. See above
illustration.
Marker (in raised position) settling
down.
Damaged O-ring in marker cylinder
or cracked piston.
Disassemble cylinder and inspect for
damage and repair.
Spool in sequencing valve not
shifting completely because detent
ball or spring is missing.
Check valve assembly and install
parts as needed.
Spool in sequencing valve shifting
back toward center position.
Restrict flow of hydraulic oil from
tractor to sequencing valve.
Neither marker will move. Flow control closed too far. Loosen locking nut and turn flow
control adjustment bolt out or
counterclockwise until desired speed
is set.
Markers moving too fast. Flow control open too far. Loosen locking nut and turn flow
control adjustment bolt in or
clockwise until desired speed is set.
Sporadic marker operation speed. Needle sticking open in flow control
valve.
Remove flow control, inspect and
repair or replace.
Lower speed
control
Raise speed
control
Butt end
Butt end
Rod ends
Spool
Left marker
Right marker