Great Plains 1007NT Operator Manual - Manual (Page 22)

18 1007NT Great Plains Manufacturing, Inc.
150-290M 10/06/2010
Drill Lift/Lower
Raising and lowering the drill relies on one front cylinder,
and one rear lift-assist cylinder. Both cylinders are on the
same circuit and operate in unison, although at different
rates front to back.
When lowered, the rear lift-assist arms raise more rapidly
than the front rockshaft, resulting in the rear caster
wheels being off the ground during planting. The rear
wheels play no role in setting planting depth.
Lowered position is set by a depth control valve, which
stops oil flow to the cylinders at a height you determine.
Raised position is normally fully raised, then lowered
onto lock channels for transport.
Raising
1. Activate the lift circuit lever to Extend the lift cylinders
fully. Set circuit to Neutral.
Raising for Transport, Parking or Storage
Refer to Figure 7 and Figure 8
3.
Set tractor parking brake and shut off tractor.
4. Rotate the lock channel at the front cylinder until
the polymer bumpers snap around the rod. Place
lock channel
on lift-assist cylinder.
Note: If any cylinder is not sufficiently extended to permit
lock channel engagement, system needs to be re-
phased (page 15)
5. Slowly move lift circuit lever to Float, allowing cylin-
ders to settle on lock channels.
6. Set circuit to Neutral to transport.
Leave circuit in Float for parking, storage or mainte-
nance.
Raising after Transport, Parking or Storage
7.
Extend circuit for lift cylinders, until cylinders clear
lock channels. Set circuit to Neutral.
8. Swing front lock channel away from cylinder rod and
remove lift-assist lock channel from rear cylinder rod.
9. Store lift-assist lock channel on side of mount .
Secure pin in hole provided.
Lowering
If lowering from transport, parking or storage, it is first
necessary to raise the drill, and disengage the lock chan-
nels.
10. Move the tractor remote circuit lever to Retract.
Normally, drill lowers until openers contact the ground,
rear lift assist wheels rise off ground, and rockshaft con-
tinues to lower until depth control stop halts front lift cylin-
der retraction.
11. Move lift circuit lever to Neutral.
See page 29 for depth control stop valve adjustments.
Crushing Hazard - Rely on circuit Neutral to hold the drill
raised only for field turns. Use lock channels for all other
raised operations: transport, parking, maintenance and stor-
age.
Figure 7
Front Lock Channel
28464
1
1
2
Figure 8
Lift-Assist Lock Channel
31610
2
3
3