Coulter down-force – Great Plains V-300F Operator Manual User Manual
Page 77
Great Plains Manufacturing, Inc.
Adjustments
73
11/15/2007
148-057M-A
To raise or lower individual coulters:
Refer to Figure 73
Note: The coulter heights are factory-set to 28.26cm
(11.13in) from bottom of tool bar to bottom of pivot
casting. Do not lower top of coulter spring bar
below tops of U-bolts
on coulter clamp.
1.
Loosen mounting all six clamp
and U-bolt
nuts
and adjust coulter spring bar
2.
To re-tighten the two clamp nuts
. Snug these hex-
head clamp bolts just until U-bolts shanks are tight
against each side of spring bar.
3.
Tighten nuts
4.
Finish tightening hex-head clamp bolts
Note: Even when coulter is held securely, there is usually
a gap between clamp halves.
Coulter Down-Force
Coulter down-force relies on all of the weight of the hitch,
plus some of the weight of the tractor, and some of the
weight of the drill. Adjusting individual rows for running in
tire tracks typically does not require weight adjustment.
Adjusting all rows to higher forces may require adding
weights to the drill. Conduct tests with an empty seed
box, and check that tires are not slipping and that row
units remain level, with openers at desired depth.
Coulter Down-Force Settings
The factory preset
for coulter spring length is 254mm
(10in). This setting is adequate for many difficult no-till
conditions. For lighter no-till conditions where rocks or
other obstructions are a problem, reduce coulter down
pressure to give coulters better impact protection.
To adjust the force, loosen the jam nut
, and turn the
adjuster nut
. Re-tighten jam nut at desired length.
Note: Do not reset coulter-spring length shorter than 248
mm (9.75in). Doing so may contribute to premature
failure of parts and warranty is voided.
Spring Length
Down Force
267 mm (10.5 in)
79 kg (175 lbs)
260 mm (10.25 in)
136 kg (300 lbs)
254 mm (10.0 in)
181 kg (400 lbs)
248 mm (9.75 in)
238 kg (525 lbs)
Figure 73
Coulter Height
10300
3
4
5
1
2
1
5
3
Figure 74
Coulter Spring
27139
1
1
2
2