Great Plains 800 Operator Manual - Manual (Page 23)

Great Plains Manufacturing, Inc. Table of Contents Index Operating Instructions 19
2011-10-25 Table of Contents Index 175-057M
Opener Operation
Opener sub-frame is on a dedicated hydraulic circuit.
The openers raise and lower as a group, controlled from
a tractor cab lever.
The following instructions presume that the openers are
raised and locked up for transport.
Crushing Hazard:
Stop tractor engine, set park brake, and remove key before
adjusting or servicing openers. You will be seriously injured or
killed if you are caught between raising openers and drill
frame. Keep all bystanders well away during drill operation.
Lowering and Raising Openers
Refer to Figure 11
1.
Determine the down-pressure pin hole , (lettered
A-E), to be used for the current conditions. If you
have no preference developed, plan to use hole “E”.
See page 28 for further information.
2. With the drill hitched to a suitable tractor, retract the
lift cylinder slightly to free the pin
in its transport
lock hole position.
3. Put the tractor circuit control in neutral to hold
cylinder position.
4. Remove the pin from the transport lock position and
transfer it to the desired down-pressure adjustment
hole. Secure the pin.
5. Extend the circuit to lower the openers.
6. When the lift cylinder has reached the end of its
travel, set the tractor circuit lever to Neutral to hold it
there.
Note: Do not set the circuit to Float, or down pressure is
significantly reduced.
At the start of planting, stop early in the first pass and
check drill level. The most consistent planting is achieved
when the drill frame is level with the ground, and the tops
of the opener frames are level with the ground.
If planting is unsatisfactory in tractor tire tracks,
see “Opener Height” on page 30.
Check periodically during planting. Drill weight changes
as seed and fertilizer are applied.
Negative Tongue Weight Hazard:
Always lower the openers for unhitching.
Falling Hazard:
Do not stand on wheels or tires. At higher down-forces and/or
on hard surfaces, lowered openers can reduce wheel traction
or allow wheels to spin freely. This could cause a fall resulting
in injury.
Figure 11
Unlocking Openers
32595
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Negative Tongue Weight Hazard:
Be certain that drill is hitched securely to your tractor
drawbar and the safety chain is securely attached to tractor
before raising openers. Raising openers on an unfolded,
unhitched drill causes drill tongue to rise suddenly, which
could cause serious injury or death.
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