GREAT PLAINS LC25, LC40 Field Adjustment Manual

FIELDADJUSTMENTGUIDE

Proper servicing and adjustment is key to the long life of all farm equipment. With careful and systematic
inspection of equipment, costly maintenance, time and repair can be avoided. The following information
will assist with recommended servicing and adjustments:

48688

Lister Cultivator

Tillage

Document # TLUS850C-0001A

Models Affected:

LC25, LC40

Date: August 4, 2015

General Information

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Document #TLUS850C-0001A

Row Unit Down Pressure (Springs):

48689

1

2

3

48670

4

48691

5

6

7

Increase individual row spring down pressure for rows
that run in tire tracks.

The following table provides the down-force values with
the tool bar and parallel arms level with the ground:

Down Force Bolt Reveal

Pounds kg Inches mm

350 160 3.20a 89

390 175 3.25 83

450 205 3.00 76

490 220 2.75 70

540 245 2.50 64

To Adjust Spring Pressure:

1) Measure the current bolt reveal (1) from the top of the
cast spring plug to the bottom of the bolt head (top of
washer) on each spring.

2) Loosen the jam nut (2) at the cast plug.

3) Turn the bolt head (3) to obtain the new reveal value.
Make the same adjustment to both springs.

Coulter Adjustment:

1) Raise the implement high enough to take pressure off
of the coulter. Adjustments can be made with the coulters
on the ground but requires more effort.

2) Remove the hairpin (4) and release the crank handle
from storage.

3) Note the current setting on the scale at the row being
adjusted. Each 1/2 number graduation represents
approximately 1” (2.5 cm) of vertical coulter movement.

4) Remove the hair pin (5) from the adjustment shaft.

5) Place the crank on the threaded rod (6) and rotate the
crank until the desired scale value appears at the top of
the pivot plate (7).

6) Adjust the crank to re-align the pin hole in the thread
rod with the slot in the scale.

7) Once adjusted, repeat steps for all rows.

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Coulter Scraper Adjustment:

48693

8

9

48694

10

11

48695

48692

12

13

14

This adjustment needs to be made as scrapers wear or
when the scrapers are replaced. At each row, check the
gaps (8) between the lower edges of the scrapers and
the coulter depth band. The factory setting is 3/32” (0.9
inch, 2.4 mm).

To adjust the scraper:

1) Loosen the nuts (9) at the slots.

2) Slide the scraper down until the correct gap is
achieved. Keep the scraper centered on the coulter
blade and tighten the nuts.

Note: If the scraper reaches the end of its slots, and the
gap (8) is larger than 3/32” (2.4 mm), the scraper is worn
out and must be replaced.

Barring-Off Adjustments (Option):

Sliding tubes and bent pins provide a choice of widths
(measured at the disc bottom edges), ranging from 11.3”
(28.7 cm) to 31.3” (79.5 cm). By alternating tube and
sleeve holes, the total width may be adjusted in incre­ments of 5/8” (16 mm).

To adjust:

1) Raise the implement slightly.

2) Remove the hairpin (10) and each bent pin (11).

3) Slide the disc mounting tubes in or out depending on
the desired width.

4) Secure the disc mount with the bent pin and hairpin.

Note: If a cap is present, do not mount a barring-off tube
in that receiver. In that current row spacing, a barring-off
disc installed in this tube would strike other implement
parts during fold.

Lister Shovel Adjustments:

Great Plains recommends operating with the lister
shovel fully raised unless conditions dictate otherwise.

To adjust the shovel height:

1) Loosen the nuts (12) on the lower shear bolts and the
lock nut (13) on the top pivot bolt.

2) Slide the mounting bar (14) up or down and re-tighten
the nuts.

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Document #TLUS850C-0001A

Note: If a lower shear bolt ever fails during operation,

48696

15

48748

16

48747

17

18

19

48747

20

21

replace it with an identical (#802-720C). Do not use a
high grade bolt, or equipment damage may result.

3) Tighten all three nuts to Grade 5 torque specification
(50 foot-pounds).

4) Ensure that all rows have identical adjustments. The
only time they may differ is for rows in tire tracks.

Furrower Disc Angle Adjustment:

This setting needs to be adjusted per the furrow profile
and conditions. The other furrower adjustments are
often satisfactory at their factory setting.

1) Loosen the eight nuts (15) on the slotted bolts and
pivot bolts. Ensure that both top and bottom bolts are all
loose.

2) Set the disc angle to the desired setting and re-tighten
the nuts.

Furrower Disc Height Adjustment:

If it is necessary to change the furrower height, first see
if the channel/mount adjustment suffices.

1) Loosen both nuts (16) on one disc side and slide the
mount up or down on the channel. Re-tighten the nuts
when adjusted.

Cultivator Height Adjustment:

1) Loosen the nuts (17) at the lower shear bolts, and the
lock nut (18) at the upper pivot bolt.

2) Slide the shank (19) up or down to the desired height.
The factory setting is 10 1/2 inches, measured from the
bottom of the row unit frame to the top of the sweep
shank weldment.

3) Tighten the lower nuts and upper lock nut to 50 foot­pounds. Note: If the lower shear bolt is ever failed by a

field obstruction, replace it with an identical (802-720C)
HHCS 7/16-14x3 1/2 GR5 PLT. Do not use a higher
grade bolt, or equipment damage may result. Using a
lower grade bolt may result in nuisance shears.

Cultivator Pitch Angle:

The upper cultivator mounting bolt (20) passes through
a slot in the shank, allowing some pitch angle adjust­ment. The factory setting is maximum nose up.

1) Loosen both the upper (20) and lower (21) nuts.
Adjust the pitch angle and secure both nuts.

Document #TLUS850C-0001A

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Cultivator Deflector Height and Angle:

48749

22

23

24

25

48750

26

48751

27

28

29

48750

48752

30

1) To adjust the angle, loosen the nuts (22) at the curved
slots and move the deflector shields (23) to the desired
angle. Re-tighten the nuts.

2) To adjust the height, loosen the nuts (24) at the mount
and slide the mount (25) up or down. Re-tighten the nuts
when the desired height is achieved.

Note: To obtain further lowering, the shield mount (25) can
be inverted to gain more distance.

Shield Adjustment:

Inward/Outward Adjustments:

1) For different row spacings, loosen the two bolts (26) that
clamp the tubes to adjust the shield inward/outward.

Forward/Rear Adjustments:

1) To move the shields forward or backwards, loosen the U­bolts (27) on the clamp bar (28) and slide the shield to the
desired adjustment.

Vertical Adjustments:

1) To adjust the shields vertically, there are three holes (29)
approximately 3 inches apart.

Height Adjustments:

1) The chain (30) length can be adjust for fine tuning height.

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Document #TLUS850C-0001A