MacDon 922 - Manual (Page 29)

Form # 46620 Issue 01/06 27
OPERATION
HEADER ANGLE
The header (or guard) angle is adjustable in the following range depending on tractor model (measured with
cutterbar on ground):
Tractor models:
XX40/XX50 8 ° to 16° below horizontal
XX52/XX52i c/w shallow angle kit 8 ° to 16° below horizontal
XX52/XX52i w/o shallow angle kit 11 ° to 18° below horizontal
Header angle is adjusted by lengthening or shortening the tractor lift linkage center link. Choose an angle that
maximizes performance for your crop and field conditions.
IMPORTANT: A flatter header angle is recommended for normal conditions. A flatter angle reduces sickle
section breakage and reduces soil build-up at the cutterbar and/or auger pans in wet conditions or where
ground is uneven (gopher mounds, etc.).
Use a steeper angle to cut very close to the ground, or for better lifting action of down crops.
See Windrower Tractor Operator's Manual for adjustment procedure.
HEADER FLOTATION
As a starting point for normal conditions, adjust float spring tension so that 75 - 85 lbs. force (335 to 380 N) is
required to lift cutterbar off ground at each end.
Benefits of lighter float settings:
1. Less cutting component breakage in rough or stony conditions.
2. Avoids soil build-up at the cutterbar and/or auger pans in wet conditions or where ground is uneven
(gopher mounds, etc.).
Benefits of heavier float settings:
1. When cutting very close to the ground, enables cutterbar to closely follow ground contours.
Header float weight changes if lift linkage center link length is changed. Float weight also varies through
first few inches of header lift cylinder extension. Check header float weight after selecting a center link
length and with header lift cylinders fully retracted. Readjust header float springs if necessary to obtain
desired float. See Windrower Tractor Operator's Manual for adjustment procedure.