Section 3: Adjustments
DH3510 & DH3512 Disc Harrow 322-251M
12/7/18
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Section 3: Adjustments
Out-of-Field Adjustments
Some adjustments can be made on concrete slabs or on
a good level surface.
Side to Side Leveling
Check tire pressure. All tires should have equal pressure.
See
on page 38. Unequal tire
pressure will allow the disc to dig in deeper on the side
with the lowest tire pressure. This will make the Disc
Harrow pull at an angle to the direction of travel.
Front to Rear Leveling
!
WARNING
To avoid serious injury or death:
•
Total compressed length of leveling springs (#3) is 12 1/2"
between flat washers. Never adjust nuts (#4) to compress
springs under 12 1/2". Compressing springs too tight can
damage the spring adjuster resulting in flying projectiles
and sudden drop of the Disc Harrow.
•
Do not fully unscrew spring adjuster rod (#5) from adjuster
tube (#6). Unscrewing the rod will result in a sudden drop
of the front disc gangs. Maximum allowable exposed rod
(#5) between nuts (#4) and adjuster tube (#6) is 15".
Most operating problems are due to unequal pressure
and penetration of the front and rear gangs. Preset the
harrow with the rear disc blades almost touching the
ground and the front disc blades approximately 2 inches
off the ground as follows:
Front to Back Leveling
Figure 3-1
Refer to Figure 3-7 on page 24:
1.
Lower Disc Harrow until rear disc blades are almost
touching the ground. Raise implement slightly and
then add stroke control spacers (#4 & #5) to the
cylinder rod until rod is full.
2. Lower machine until cylinder is pressing against the
stroke control spacers.
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3. Turn spring adjuster to position the front disc blades
approximately 2 inches above the rear disc blades as
follows:
•
Turn spring adjuster (#2) clockwise with adjusting
lever (#1) to lower the rear disc blades.
•
Turn spring adjuster (#2) counterclockwise with
adjusting lever (#1) to raise the rear disc blades.
Disc Gang Angle Adjustment
!
CAUTION
To avoid minor or moderate injury:
Refer to Figure 3-2. Keep everyone clear of swing arm hanger
brackets while adjusting disc gang angles. Body extremities
can become pinched in the bracket openings.
Pinch Point Hazard
Figure 3-2
Disc Gang Angle Adjustment (Rear Gangs Shown)
Figure 3-3
It is best if the disc gang angles are set at the smallest
angle required to do the job. Refer to values provided in
Figure 3-4 when adjusting the front disc gang angle and
Figure 3-5 when adjusting the rear disc gang angle. A
good starting angle is 18.5 degrees for the front gangs
and 16.5 degrees for the rear gangs.
Make adjustments with disc gangs off the ground:
1.
Remove hairpin cotters (#1) from rear gang slide
mount.
2. Remove stabilizing bar (#2) from pin (#3).
3. Place hole in adjusting lever (#4) over pin (#3). Make
sure pin (#5) on adjusting lever is facing up.
4. Place one of the holes in stabilizing bar (#2) over
pin (#5).
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