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8.1 Hydraulic Cylinder Depth Adjustment
1. Remove all stroke control spacer (4 & 5) from the hydraulic cylinder.
2. Lower disc harrow to desired working depth and travel forward. Your travel speed will be determined by
soil conditions.
3. When working depth is achieved, stop tractor, shout tractor engine off, and remove switch key.
4. Select required size and number of stroke control spacers (3) that will fit between hydraulic cylinder and
rod eye clevis. The following spacers are available.
•
Two 1" Spacers
•
One 1-1/4" Spacer
•
One 1-1/2" Spacer
•
One 1-3/4" Spacer
5. Return to the tractor and raise the disc harrow up. Once fully raised, turn tractor engine off and remove
switch key.
6. Install preselected stroke control spacers on the cylinder rod.
7. Lower disc harrow against installed stroke control spacer. Recheck working depth. If needed, adjust size
and quantity of stroke control spacers until desired working depth is achieved.
8.2 Disc Gang Angle
Increasing the disc gang angle will help the disc harrow to penetrate the soil and remove vegetation. However,
too much angle can cause the disc harrow to operate erratically. Therefore, it is best if the disc gang angles are
set at the smallest angle required to do the job. Make sure the angle of the front disc gangs is 3 degrees more
than the rear disc gangs. See Troubleshooting Section for helpful solutions to setting the disc gang angles.
8.3 Disc Leveling Front to Rear
Te truest way to level your disc from front to rear is to observe behind the center of the disc harrow. In most soil
conditions, 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 from that will disappear after a soaking rain.
1. If unit is leaving a significant ridge in the center, raise disc rear gangs by turning threaded rod
counterclockwise.
2. If unit is leaving a furrow (valley) in the center, lower the rear disc gangs by turning threaded rod clockwise.
3. See Troubleshooting Section for helpful solutions to leveling the disc harrow.
8.4 Disc Blade Replacement
When replacing notched disc blades, assemble he disc blades in a spiral pattern. Order 3/8" thick washer(s)
from your nearest Bush Hog Dealer if axle nut(s) runs out of threads before the disc blades are tight on the
axle.
9. PRE-OPERATION INSPECTION AND SERVICE
Before each use, a pre-operation inspection and service of the implement and tractor must be performed.
This includes routine maintenance and scheduled lubrication, inspecting that all safety devices are equipped
and functional, and performing needed repairs. DO NOT operate the unit if the pre-operation inspection
reveals any condition affecting safe operation. Perform repairs and replacement of damaged and missing
parts as soon as noticed. By performing a thorough pre-operation inspection and service, valuable down time
and repair cost can be avoided. OPS-U-0029
DHP8, DHP10, DHP12
© 2021 Alamo Group Inc.
OPERATION
05/21
Operation Section 4-12
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