Great Plains John Deere 30' Dual 750 Flat Fold Markers - Manual (Page 11)

3/20/2003 205-052M
9 Hydraulic System
Adjusting The Hydraulics
1. Be sure tractor hydraulic reservoir is full.
2. With the markers in field position, crack the
hydraulics hose fittings located at the base end of
one of the cylinders. With the tractor at an idle
speed, activate the tractor hydraulics valve until
hydraulic oil seeps out around the hose end. Tighten
the hose end fittings. Repeat this process for the
hose at the rod end of the cylinder. Crack the fittings
on the back side of the sequence valve until
hydraulic oil seeps out. Tighten and repeat for the
opposite cylinder.
3. Cycle each cylinder 3 or 4 times slowly. Both arms
should move to the vertical position on the first move
and then they should lower and raise alternately as
the hydraulic lever is operated.
4. Fold and unfold the marker(s) slowly in order to work
all the air out of your marker hydraulics. Use caution
when folding and unfolding the marker for the first
time, and check for pinching and kinking of hoses.
!
CAUTION
Never allow anyone near the drill when cycling the markers.
5. The marker hydraulic system is equipped with
needle 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 raising the markers, and one for
lowering the markers. These are stamped in the
valve body. To adjust the speed of each marker,
screw the needle valve clockwise to adjust the raise
or lower marker speed to a low setting. Fold the
marker up and down a few times and recheck for
pinching and kinking of hoses. With the tractor
engine at an operating rpm, adjust the needle valve
to limit the marker to a safe operating speed.
Excessive folding speeds can cause marker
damage.
!
CAUTION
Excessive folding speeds can cause marker damage!
!
CAUTION
Escaping Fluid under pressure can have sufficient force to
penetrate the skin. Check all hydraulic lines and hoses before
applying pressure. Fluid escaping from a very small hole can
be almost invisible. Use paper or cardboard, not body parts,
to check for suspected leaks. If injured, seek medical
assistance from a doctor that is familiar with this type of
injury. Foreign fluids in the tissue must be surgically removed
within a few hours or gangrene will result.
General Notes
The markers cycle in the following sequence
(1)Right Up, Left Up
(2)Right Down, Left Up
(3)Right Up, Left Up
(4)Right Up, Left Down
(5)Sequence Repeats
NOTE: 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.
Hydraulic System