GREAT PLAINS Yield-Pro PL5800, Operator'S Manual

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PL5800 Planter Table of Contents Index Operation
Great Plains | 411-474M | 12/17/2019 39
Down-Pressure Adjustment
Row unit springs provide the down pressure
necessary for row unit disks to open a seed trench.
The springs allow the row units to float down into
depressions and up over obstructions. The springs
also provide down force on coulters when using
optional row mounted coulters.
You can adjust down pressure individually for each
row unit. This is useful for penetrating hard soil and
planting in tire tracks. For best results, always adjust
tractor tires so the ires are not ahead of 30 inch or 70
cm rows.
Use only enough down pressure to cut the seed
trench and maintain proper soil-firming over seed.
Excessive row unit down force will lead to premature
wear on row unit components. Excessive down force
will also cause uneven seed depth.
To adjust down pressure:
1. Use 1 1/8 inch (29 mm) open end wrench or the
tool (1) stored under the walkboard.
2. Position the wrench or supplied tool on the nut
(2). Pull back and down.
3. Move the adjustment cam (3) to the new setting.
Minimum setting (4) and maximum setting (5) are
indicated by the position of the adjustment cam.
Each notch on the adjustment cam will increase
the down pressure on the row unit springs. Use
the table as a setting reference.
Do not set all rows any higher than notch 4. Using
settings above this on all rows will create uneven
depth control and improper function.
Individual rows may be set higher if running in heavy
tires tracks.

Row Unit Opener Disks
The 25 Series openers have three adjustments:

planting seed depth,

openers disk to disk clearance, and

gauge wheel/opener disk clearance.
68907A
68157
1
68158
2
3
Cam Notch Pounds Kilograms
out of notch Lock-up and maintenance
1 320 145
2 355 160
3 385 175
4 435 200
5 485 220
6 535 245
tip of cam Do not use
27065
4
27065
5