Great Plains 3N-4020 Operator Manual - Manual (Page 26)

22 3N-4010F/3N-4010HDF/3N-4020F Table of Contents Index Great Plains Manufacturing, Inc.
196-359M Table of Contents Index 2013-10-29
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, lubri-
cation, 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 2in coulter depth.
See “Frame Height” on page 60 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 nor-
mal 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 3rd or 4th 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 sys-
tem
1 ⁄
2
inch (13mm) to maintain levelness.
If implement is still not level after re-phasing, see “Bleed-
ing Lift Hydraulics” on page 105 and “Level Frame
Side to Side” on page 102.
Figure 18
Transport Locks Installed
20264
20266
Figure 19
Lock Channel Storage
20268
20269