Bush Hog DHP10, Operator'S Manual

Page: 44 / 68

OPERATION
DHP8, DHP10, DHP12 05/21 Operation Section 4-10
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© 2021 Alamo Group Inc.
7. PRE-FIELD ADJUSTMENTS
7.1 Side to Side Leveling
Check tire pressure. All tires should have equal pressure. 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.
7.2 Front to Rear Leveling
Total compressed length of leveling springs (4) is 12-1/2” between flatwashers. Never adjust
nuts (5) 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 threaded rod (2) from threaded rod 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:
1. Lower Disc Harrow until rear disc blades are
almost touching the ground. Raise implement
slightly and then add stroke control spacers (1)
to the cylinder rod until rod is full.
2. Lower machine until cylinder is pressing
against the stroke control spacers.
3. Turn spring adjuster to position the front disc
blades approximately 2 inches above the rear
disc blades as follows:
• Turn threaded rod (2) clockwise with adjusting lever (3) to lower the rear disc blades.
• Turn threaded rod (2) counterclockwise with adjusting lever (3) to raise the rear disc blades
7.3 Disc Gang Adjustment
Keep everyone clear of gang arm hanger brackets while adjusting disc gang angles. Body
extremities can become pinched in the bracket openings.
It is best if the disc gang angles are set at the smallest angle required to do the job. Refer to values provided
when adjusting the front disc gang angle and when adjusting the rear disc gang angle. A good starting angle is
18 degrees for the front gangs.,
Make adjustments with the disc gangs off the ground:
1. Remove hairpins (1) from angle adjuster and angle frame pin.
2. Remove angle bar (2)
3. Place hole in adjusting lever (3) over angle adjuster pin (4). Make sure pin (5) on adjusting lever is facing
up.
4. Place one of the holes in angle bar (2) over pin (5).
5. Determine which hole to select in the angle bar when setting disc gangs to the desired angle.
6. Pull or push on lever handle (3) to move disc gangs forward or rearward until selected hole in angle bar
aligns with pin (4).