Great Plains EWF13 13-Foot End Wheel Vintage Drills - Manual (Page 9)

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7 4/9/04 Great Plains Mfg., Inc.
Section 3 Hydraulic System
13’ End Wheel Drill Single/Dual Hydraulic Marker 113-530M
Adjusting The Hydraulics
1. Be sure tractor hydraulic reservoir is full
2. 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.
3. 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
raising the markers, and one for lowering the mark-
ers. 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 operat-
ing speed. 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
1fpbefore 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 med-
ical assistance form 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.
Section 3
Hydraulic System