Great Plains FH6800HD Operator Manual - Manual (Page 20)

16 FH6000HD Great Plains Manufacturing, Inc.
564-070M 04/28/2014
Unfold Harrow
The Flex Harrow has a single hydraulic circuit that com-
bines the lateral (wing) and vertical (harrow) unfolding
operations. During unfold, the wings first fully unfold, and
then the harrows lower to the ground.
1. Position the hitched and folded harrow on the field to
be worked, or on suitable other ground. Unfolding
brings the tines into ground contact, and some for-
ward movement is required to lay the sections flat.
2. Double-check that the harrow is securely hitched to
the tractor or leading implement.
Refer to Figure 6
3.
Lift the transport chain off the wing pin on both
wings.
4. Start the tractor. Set the brakes. Operate the engine
at low rpms.
Refer to Figure 7
5.
Slowly extend the fold circuit. Wings unfold (swing
back). Do not move the tractor until the wings are
fully unfolded.
6. As wings reach fully unfolded, release the brakes.
Negative Tongue Weight Hazard:
Allow no one near or especially behind the unfolding imple-
ment. During unfold the tongue weight shifts from positive to
temporarily negative. If the hitch fails or there is a hydraulic
failure, the harrow can tip over backwards or the harrows can
fall suddenly. Anyone under them could be seriously injured or
killed.
Refer to Figure 8
7.
As sections begin to fold down, pull forward.
8. When the sections are on the ground, continue to
extend the fold circuit until the cylinders are fully
extended.
Figure 6
Transport Chain
31665
1
1
Figure 7
Wings Unfolding
31666
Figure 8
Sections Lowering
31667