Great Plains 3N-4025P Operator Manual - Manual (Page 29)

Great Plains Manufacturing, Inc. Table of Contents Index Operating Instructions 25
2014-01-29 Table of Contents Index 196-538M
Lift / Lower
Machine Damage Risk:
Lower only when the drill is unfolded. The drill must be raised
and locked up for folding and unfolding.
The drill has six rephasing lift cylinders that raise and
lower the opener frame.
Six (6) transport locks are provided, two for the rockshaft
(center forward) cylinders, and one each for the rear and
wing caster cylinders. These assure that the drill stays
raised during folding/unfolding, transport, storage,
lubrication, maintenance and some setup/adjustment
tasks.
Opener Operation Lowered
The “lowered” position of the opener frame is regulated
by an adjustable valve, factory set for 2 inch coulter
depth. See “Frame Height” on page 72 for adjustment.
Rephasing Lift System
Over a period of normal use the cylinders may get out of
phase. This causes some implement sections to run
higher than others when lowered. To minimize this, or
rephase the cylinders, make the following steps your
normal raise sequence:
9. Raise drill completely and hold the hydraulic remote
lever on for several seconds until all cylinders are
fully extended. Do this every third or fourth time you
raise the drill out of the ground.
10. When all cylinders are fully extended, momentarily
reverse the hydraulic remote lever to retract the
system
1 ⁄
2
inch (13 mm) to maintain levelness.
If implement is still not level after re-phasing, “Bleeding
Lift Hydraulics” on page 145 and “Level Frame Side to
Side” on page 142.
Figure 23
Transport Locks Installed
20264
20266
Figure 24
Lock Channel Storage
20268
20269