Great Plains 3N-4020 Assembly Instructions - Manual (Page 9)

2/28/2006 113-777M
Great Plains Mfg., Inc.
9 Installation Instructions
Bleeding Marker Hydraulics
!
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 unfolding markers.
Refer to Figure 11
1. Make sure tractor hydraulic reservoir is full.
2. With markers unfolded in field position, crack
hydraulic-hose fittings (1) at base and rod
ends of each marker cylinder.
IMPORTANT: Never bleed an O-ring fitting. In-
stead, bleed a nearby pipe or JIC fitting.
3. With tractor at idle speed, activate tractor hy-
draulic valve forward until oil appears at one
fitting. When oil begins to seep out around a
fitting, tighten that fitting. Reverse the tractor
hydraulic valve until oil appears at opposite
hose fitting and tighten that fitting.
4. If you have dual markers, activate your tractor
hydraulic valve forward again until oil seeps
out around one fitting on the other marker cyl-
inder and tighten that fitting. Reverse tractor
hydraulic valve until oil seeps out around re-
maining hose fitting and tighten it.
5. Fold and unfold markers slowly to work out all
air.
NOTE: Use caution when folding and unfolding
markers for the first time, checking for pinching and
kinking of hoses.
6. Adjust marker folding to a safe speed. Refer
to Marker Adjustment in the operator’s manu-
al.
Figure 11
Bleeding Marker Hydraulics
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