Great Plains 4336 DH Operator Manual - Manual (Page 30)

26 3323-4336DH Table of Contents Index Great Plains Manufacturing, Inc.
556-100M Table of Contents Index 05/22/2012
18. Fold Cylinders: Fold cylinders are to extended fully in
field position. Running the fold cylinders retracted may
cause excessive cylinder seal damage due to constant
loading from the flexing action of the wings.
Front to Rear Level
Refer to Figure 22
19. The truest way to level front to rear is to observe
behind the center of the disk harrow. In most soil con-
ditions, a slight ridge in the center is actually a level
operation. More air pockets will form where soil is
thrown against each other, causing a small ridge to
form the will disappear after a soaking rain. If the unit is
leaving a significant ridge in the center, raise the rear
of the disk by extending the front leveling cylinder
(or
turnbuckle) so the indicator approaches “A” . If the
disk is leaving a furrow behind the machine, lower the
rear by retracting the leveling cylinder
(or turnbuckle)
so the indicator is approaching “G” . You may want to
plug your red handles into your tractor opposite of the
other handles so the direction of lever movement
matches the direction od disk movement.
Refer to Figure 23
20. Hydraulic Leveling Cylinder Reset: The leveling cylin-
der has a two way lock valve that traps oil on both
sides of the cylinder piston. This may need to be reset
after several hours of operation. When disk is operat-
ing level, take note of the letter indicator on the leveling
bracket. If, over time. this pointer begins to drift from
the indicator, reset the level. It is a good idea to hook
this set of hoses to a control so it does not get moved
unintentionally.
Figure 22
Depth Indicator
42106
1
2
3
1
2
1
3
Figure 23
Lock Valve
42114
1
1