Great Plains PH-20 Operator Manual - Manual (Page 22)

20
Section 3 Adjustments
PH-15, PH-20, PFH-15 and PFH-20 Precision Fertilizer Hitch 148-365M 12/29/2011
Great Plains Mfg., Inc.
Coulter Springs
Coulter spring length is preset at the factory to 10 inches,
giving coulters an initial operating force of 400 pounds
(181 kg). This setting is adequate for many difficult no-till
conditions. For lighter no-till conditions where rocks or oth-
er obstructions are a problem, you can reduce spring load
to give coulters better impact protection. Refer to the fol-
lowing chart when adjusting coulter spring length.
Figure 3-4
Coulter Spring
NOTE: Do not reset coulter spring length shorter than
9 3/4 inches (24.77 centimeters). Shortening springs
more than 9 3/4 inches (24.77 centimeters) may contribute
to premature failure of parts and warranty will be voided.
Spring Length Preload
10 1/2 in (26.67 cm) 175 lbs (79 kg)
10 1/4 in (26.03 cm) 300 lbs (136 kg)
10 in (25.40 cm) 400 lbs (181 kg)
9 3/4 in (24.77 cm) 525 lbs (238 kg)
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