Spearhead TWIGA
120
21
21
21
21
CUTTERBAR
CUTTERBAR
CUTTERBAR
CUTTERBAR
Adjusting the Knife Guides
Before commencing any checks or adjustments lay the cutterbar flat on the ground, select
cutterbar off', switch off the tractor remove starting key and disconnect the conrod.
When adjusted correctly the knife sections (4) lie flush between the fingers and the
underside of the knife holder (1) with the fingers projecting 6mm to 8mm in front of the
knife tips. In addition there must be a maximum clearance of 1mm between the sloping
faces of the knife holder (1) and the guide plate (2). This allows clearance for the knife to
move freely and can be checked by placing a 5/8" dia bar into the con rod socket in the
knife heel and operating by hand. The guide plate (2) and rubbing plate (3) are mounted
through slotted holes which allow the correct lateral positioning of the knife in relation to
the fingers. Any play caused by wear between the knife holder (1) and the knife sections
(4) is removed by turning the setscrew (5). The knife guide should be adjusted until the
mating faces are flush. No downward pressure should be exerted onto the knife as this
may impede its free movement.
