Great Plains 2015 Operator Manual - Manual (Page 21)

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19 4/18/05 Great Plains Mfg., Inc.
Section 4 Adjustments
2015 Three-Point Soybean Machine 173-088M
Figure 3-3
Direction of Cut Reversed
Folding Speed Adjustment
Each marker is equipped with a needle valve to control
how fast the marker operates. The needle valve is locat-
ed in the hydraulic hose line at the rod end of the marker
cylinder as shown in Figure 3. Turn the adjustment knob
clockwise to slow the speed down and counterclockwise
to speed it up. Adjustments should be made for safe op-
erating speeds at the tractors operating RPM. Excessive
folding speed could damage the marker and may void
the warranty.
Bleeding Marker Hydraulics
To fold properly, the marker hydraulics must be free of
air. If the markers fold in jerky, uneven motions, follow
these steps.
!
CAUTION!
You may be injured if hit by a folding or unfolding marker.
Markers may fall quickly and unexpectedly if the hydraulics
fail. Never allow anyone near the drill when folding or un-
folding the markers.
!
WARNING!
Escaping fluid under pressure can have sufficient pressure to
penetrate the skin causing serious injury. Avoid the hazard by
relieving pressure before disconnecting hydraulic lines. Use a
piece of paper or cardboard, NOT BODY PARTS, to check for
leaks. Wear protective gloves and safety glasses or goggles
when working with hydraulic systems. If an accident occurs,
see a doctor immediately. Any fluid injected into the skin must
be surgically removed within a few hours or gangrene will re-
sult.
1. Check that the tractor hydraulic reservoir if full.
2. With the markers in field position, crack the hose fit-
tings at the base end of both cylinders. With your
tractor at an idle speed, engage hydraulic lever until
oil seeps out around one of the cracked fittings.
Tighten that fitting.
3. Crack the hose fitting at the ram end of the cylinder
which seeped oil. Reverse tractor hydraulic lever
until oil seeps out around the fitting. Tighten the fit-
ting.
4. Engage hydraulic lever until oil seeps out around the
base-end fitting on the other cylinder. Tighten the fit-
ting.
5. Crack the remaining ram-end hose fitting. Reverse
hydraulic lever until oil seeps out around the fitting.
Tighten fitting.
6. Fold and unfold the markers slowly to work all air out
of the circuit.
16403
Figure 3
Folding Speed Adjustment
15625
Needle Valve
Slower Faster
IMPORTANT: Never attempt to bleed an O-ring type
fitting. Instead, choose a pipe or JIC fitting nearby.