Unfolding the drill – Great Plains 3N-4020 Operator Manual User Manual
Page 28
24
3N-4010F/3N-4010HDF/3N-4020F
Great Plains Manufacturing, Inc.
196-359M
2013-10-29
Note: There are two key points to remember when oper-
ating the lock cylinders.
a. All seven lock cylinders are plumbed together,
and all move at the same time.
b. Operate the lock circuit lever (Retract/Neutral)
only once to fold. As the cylinders move, they
unlock 6 points then stop in a “ready to fold
position.” When the drill is folded, the 7th lock,
spring loaded, snaps shut, locking the drill.
5.
Extend the Fold cylinder circuit lever to slowly fold
wings forward. The transport lock automatically cap-
tures the right wing tool bar for transport.
Note: It may be necessary to ease forward slightly with
the tractor to assist wings in folding completely.
Unfolding the Drill
Machine Damage Risk:
Unfold only when the drill is raised and locked up.
Unfold the drill on level ground with the tractor transmis-
sion in neutral.
Crushing, Pinch-Point and Overhead Hazards:
To prevent serious injury or death:
▲ Always use transport locks when drill is folded.
▲ Fold only if hydraulics are bled free of air and fully charged
with hydraulic oil.
▲ Stay away from frame sections when they are being raised
or lowered.
▲ Keep away and keep others away when unfolding drill.
Note: When unfolding, operate the lock circuit exactly in
reverse of folding. Operate the circuit once (Ex-
tend/Neutral). Remember that when the cylinders
move, they release one lock, and enable six others,
stopping in a “ready to unfold” position. As the drill
is unfolded, the six spring loaded locks snap shut,
locking the drill.
Refer to Figure 23
1.
Check selector valve set to Locks.
Figure 22
Swivel Lock Cylinder
27183
Pinch/Crush Risk:
Center section of drill moves forward while unfolding.
Tractor may move backward. Keep all personnel clear of drill
and tractor wheels.
Figure 23
Unfold: Drive/Lock Selector Valve
21844
Figure 24
Transport/Tool Bar Lock Cylinders
21841
21845