Great Plains Manufacturing, Inc.
Operating Instructions
37
04/09/2019
166-283M
Raising
Equipment Damage Risk:
Raise the implement for folding and unfolding. If lowered,
inside wing openers drag or dig sideways during fold/unfold,
and damage is likely.
Equipment Damage Risk:
Always raise the implement for tight turns and reverse/backing
operations. Backing with openers lowered causes row unit
plugging, and may cause opener damage. Tight turns with
openers lowered may damage openers near the turn center.
Equipment Damage Risk:
On tractors with electronic timer controls for hydraulic cir-
cuits, lift timers must be set to no more than 2 seconds longer
than needed to fully raise air drill. To reduce oil heating and
system wear, Do Not Set for Continuous Mode.
Regulatory Requirement:
Unless the gauge wheels are in the lowered (tucked) positions
when the drill is folded, the air drill may not meet transport
clearance requirements that apply to your operations.
1. Make sure all persons are clear of opener sections.
2. Activate dedicated Lift circuit (normally Extend).
3. Extend cylinders until all sections are raised. Hold for
a few seconds to re-phase cylinders.
4. Set circuit to Neutral to temporarily hold sections at
raised.
Raising: Center Lift Lock
For convenience during field turns, the center section lift
lock does not automatically engage during lift. The lock
does automatically engage during full fold. To engage the
lock without folding, follow these additional steps:
5. Verify that all persons are safely clear of implement
sections.
6. Close the fan shut-off valve (page 31).
7. Have an observer stand where the observer can see
the lock cylinder, and the tractor operator can see
the observer.
8. Press “Enable Fold” softkey on seed monitor.
9. Activate the Fold/Fan circuit for folding (typically
Retract). Hold at fold until the observer signals that
the lock cylinder has extended. The lock cylinder
normally extends early in the fold cycle.
10. Gradually move the Fold circuit to neutral, to allow
any wing folding to reverse, by not cause the lock
cylinder to retract.
11. Lower the implement until stopped by the lock. This
also prevents the lock from releasing. Set the Lift cir-
cuit to neutral.
Note: Gauge wheel lock channels are provided to hold an
unfolded implement at the fully raised position, for
maintenance only. These channels are an import-
ant safety feature for maintenance, but are not
used in normal operations.
Null4:
Figure 28
Implement Lowered / Raised
31147
Null4:
Null4:
Null4:
Unfolded Lift Lock: Wing Pinch and Crushing Hazards:
The lift lock prevents the center section from lowering, but
only hydraulic oil prevents wings from lowering at the tips.
Use maintenance locks to hold wings raised for extended peri-
ods. See page 107.
Figure 29
Lift Lock Engaged
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