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Great Plains
| 166-207M | 02/26/2019
130
NTA907HD and NTA3007HD
Maintenance and Lubrication
Marker Maintenance
Review “
” on page 60 before
performing maintenance on markers.
See also:
“
” on page 97, and
Marker Shear Bolt
The marker arm is attached to marker body with a shear
bolt
, which is intended to fail if the marker strikes an
obstruction, allowing the marker to swing back around a
second bolt
.
If the shear bolt breaks, replace it with an equivalent
7
16
-14x2in Grade 5 bolt (Great Plains part 802-589C).
If that size is not available in your local market, substitute
an M10x1.5 Class 8.8 metric bolt and nut.
If your conditions result in frequent shears, the marker
shear base has storage holes for spare bolts.
Replacing the bolt with a lower grade, or smaller size,
can result in nuisance shears.
Replacing the bolt with a higher grade can result in marker
damage.
Marker Hydraulic Bleeding
1.
Review warnings, bleeding notes and system
information on page 111.
2.
With markers unfolded in field position, crack
hydraulic-hose JIC fittings at base
and rod ends
of each marker cylinder.
3.
With tractor at idle speed, activate tractor hydraulic
valve forward until oil appears at a 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. Tighten that fitting.
4.
If you have dual markers, activate tractor hydraulic
valve forward again until oil seeps out around a fitting
on the other marker cylinder. Tighten that fitting.
Reverse tractor hydraulic valve until oil seeps out
around remaining hose fitting and tighten it.
5.
Fold and unfold markers slowly to work out all air.
Use caution when folding and unfolding markers for
the first time, checking for pinching and kinking of
hoses.
Figure 148
Marker Shear Bolt
23204
1
2
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.
Figure 149
Marker Bleed Points
29489
1
2
Содержание NTA3007HD
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Страница 4: ...2SF24 and 2SF30 ...
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