Maintenance
30
MARKER SEQUENCING/FLOW CONTROL
VALVE INSPECTION
The valve block assembly consists of the
marker sequencing and flow control valves in
one assembly. The sequencing valve portion
consists of a chambered body containing a
spool and series of check valves to direct
hydraulic oil flow. Should the valve
malfunction, the components may be
removed for inspection.
1. Remove valve block assembly from
planter.
2. Remove detent assembly and port
adapter assemblies from rear of valve
block.
IMPORTANT: Damage to the spool may
occur if the detent assembly and port
adapter assemblies are not removed prior
to removal of the spool.
3. Remove plug from both sides of valve
block and remove spool.
4. Inspect all parts for pitting, contamination
or foreign material. Also check seating
surfaces inside the valve. Replace any
parts found to be defective.
5. Lubricate spool with a light oil and re-
install. Check to be sure spool moves
freely in valve body.
IMPORTANT: Make sure correct check
ball(s) and spring are installed in each
valve bore upon reassembly.
A flow control valve is located on each side
of the block assembly. The flow control
valves should be adjusted for raise and
lower speed as part of the assembly
procedure or upon initial operation. If the
valve fails to function properly or requires
frequent adjustment, the needle valve should
be removed for inspection. Check for foreign
material and contamination. Be sure needle
moves freely in adjustment screw. Replace
any components found to be defective.
NOTE: When oil is cold, hydraulics
operate slowly. Make sure all adjustments
are made with warm oil.
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