TM
Model 3500M0258-01
9/14 7-3
Troubleshooting
ROW MARKER OPERATION TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE SOLUTION
Both markers lowering and
only one raising at a time.
Hoses from cylinders to
valve connected backwards.
Check hosing diagram in manual
and correct.
Same marker always operating. 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 lower and raise at
same time.
Foreign material under check ball in
sequencing valve.
Remove hose fitting, spring and balls
and clean. May be desirable to remove
spool and clean as well.
Check ball missing or installed
incorrectly in sequencing valve.
Disassemble and correct. Refer to
Lubrication and Maintenance section of
this manual.
Marker (in raised position) settling
down.
Damaged O-ring in marker cylinder
or cracked piston.
Disassemble cylinder, 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 moves. 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 out until desired
speed is set.
Sporadic marker operation speed. Needle sticking open in flow control
valve.
Remove flow control, inspect and repair,
or replace.
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