Great Plains PD8070 Operator Manual - Manual (Page 30)

PD8070
401-266M 1/24/2006
28
Marker Adjustments
Refer to Figure 24
!
WARNING
Pinching and crushing hazard. The moving markers could
pinch or crush bystanders. Never allow anyone near the
planter when cycling the markers. Reduce marker folding
speed to a safe speed.
!
WARNING
Escaping fluid under pressure can have sufficient pressure
to penetrate the skin. Check all hydraulic lines and fittings
before applying pressure. Fluid escaping from a very
small hole can be almost invisible. Use paper or card-
board, not body parts, and wear heavy gloves to check for
suspected leaks. If injured, seek medical assistance from a
doctor that is familiar with this type of injury. Foreign flu-
ids in the tissue must be surgically removed within a few
hours or gangrene will result.
Folding Speed
The marker hydraulic system is equipped with nee-
dle valves to control how fast each marker operates.
The needle valves are built into the sequence valve
body. There are two hex adjustment heads, one for
controlling marker speed up and one for controlling
marker speed down.
Excessive folding speeds can cause marker dam-
age. With the tractor engine at an operating rpm,
loosen jam nut and adjust the needle valve to limit the
marker to a safe operating speed. Make sure all ad-
justments are made with warm oil. Fold the marker
up and down a few times and recheck for pinching
and kinking of hoses.
IMPORTANT: JIC fittings do not require high torque.
JIC and O-ring fittings do not require sealant. Always
use liquid pipe sealant when adding or replacing
pipe-thread fittings. To avoid possible danger of
cracking hydraulic fittings from over tightening, do not
use plastic sealant tape.
15029
Figure 24
Flow Control Raise/Lower