Great Plains 3S-5000HDF Assembly Instructions - Manual (Page 17)

Test Marker Function Front Page Appendix Great Plains Manufacturing, Inc. 17
2013-04-09 Front Page Appendix 113-890M
Test Marker Function
83. Verify overhead clearance. Normal marker height
during fold and unfold is over 14 feet (4.3 m). Some
electric power lines are lower than this height. In the
event of a malfunction or misconfiguration, the
marker arms could be completely unfolded at full
vertical. This could strike higher electric lines and/or
cause roof or ceiling damage if working indoors.
Pinch, Crush and Overhead Hazards:
Clear all persons from the vicinity of both sides of the drill.
The marker side that initially folds is uncertain. There are
multiple points in the mechanisms which could cause severe
pinching or crushing. The raised arms are heavy and also
move downward with considerable hydraulic force.
Equipment Damage Risk:
Be prepared to stop the fold if there is any indication of
malfunction. If there is any binding, slamming or sudden
movement, or the sequence does not match the illustration,
stop and investigate. The cylinders are powerful enough to
cause significant damage if the system is misconfigured.
Refer to Figure 29 (Depicting a normal fold)
84. Verify that the fold/marker selector valve is still set for
Markers.
85. Slowly Retract the fold/marker circuit. Only one
marker side folds at a time. Observe the folding.
Make sure it matches the illustration.
86. When the first marker has completely folded, move
the circuit lever to Extend for a few seconds (even
through the other marker is already unfolded). This
alternates the sequence valve to the other side.
Slowly Retract the circuit. Observe the folding. Make
sure it matches the illustration.
87. Set the circuit to Extend. This unfolds the previous
side. Observe the unfolding. Make sure it matches
the illustration. Then Retract until that side is folded.
88. Set the circuit to Extend. This unfolds the previous
side. Observe the unfolding. Make sure it matches
the illustration. Then Retract until that side is folded.
Set circuit to Neutral.
89. Repeat step 87 and step 88 once more, taking note
of the cycle time. A complete unfold/fold cycle for
each side should take approximately 15 seconds,
with fold taking slightly longer than unfold. If the fold
or unfold speeds are more than 3 seconds faster or
more than 6 seconds slower, see “Adjust Marker
Speed” on page 20.
Figure 29
Normal Marker Fold
34839
Electrocution Hazard:
If the drill contacts a power line, lethal voltage may be present
on all metal parts. At higher voltage, the drill does not need to
be in line contact for the hazard to exist. Maintain at least
10 foot (3 m) clearance.