10
Operation
Note: Determine the left and right sides of the machine
from the normal operating position.
Cutting Unit Characteristics
The dual knob bedknife-to-reel adjustment system
incorporated in this cutting unit simplifies the adjustment
procedure needed to deliver optimum mowing
performance. The precise adjustment possible with the dual
knob/bedbar design gives the necessary control to provide a
continual self-sharpening action—thus maintaining sharp
cutting edges, ensuring good quality-of-cut, and greatly
reducing the need for routine backlapping.
Daily Adjustments of Cutting
Unit
Prior to mowing each day, or as required, each cutting unit
must be checked to verify proper bedknife-to-reel contact.
This must be performed even though quality of cut is
acceptable.
1. Lower the cutting units onto a hard surface, shut off the
engine, and remove the ignition key.
2. Slowly rotate the reel in a reverse direction, listening
for reel-to-bedknife contact. If no contact is evident,
turn the bedknife adjusting knobs clockwise, one click
at a time, until light contact is felt and heard.
Note: The adjustment knobs have detents corresponding to
0.0007 in. (0.018 mm) bedknife movement for each
indexed position.
3. If excessive contact is felt, turn the bedknife adjusting
knobs counterclockwise, one click at a time until no
contact is evident. Then turn the bedknife adjusting
knobs one click at a time clockwise, until light contact
is felt and heard.
Important
Light contact is preferred at all times. If
light contact is not maintained, the bedknife/reel edges will
not sufficiently self-sharpen and dull cutting edges will
result after a period of operation. If excessive contact is
maintained, bedknife/reel wear will be accelerated, uneven
wear can result, and quality of cut may be adversely
affected.
Note: As the reel blades continue to run against the
bedknife, a slight burr will appear on the front cutting edge
surface along the full length of the bedknife. If a file is
occasionally run across the front edge to remove this burr,
improved cutting can be obtained.
After extended running, a ridge will eventually develop at
both ends of the bedknife. These notches must be rounded
off or filed flush with the cutting edge of the bedknife to
ensure smooth operation.
Maintenance
Note: Determine the left and right sides of the machine
from the normal operating position.
Servicing the Bedbar
Removing the Bedbar
1. Turn bedbar adjuster screw, counterclockwise, to back
bedknife away from reel (Fig. 17).
1
2
3
Figure 17
1.
Bedbar adjusting screw
2.
Spring tension nut
3.
Bedbar
2. Back out the spring tension nut, until the washer is no
longer tensioned against the bedbar (Fig. 17).
3. On each side of the machine, loosen the nut securing the
bedbar bolt (Fig. 18).
1
2
Figure 18
1.
Bedbar bolt
2.
Nut
4. Remove each bedbar bolt allowing bedbar to be pulled
downward and removed from machine (Fig. 18).
Account for 2 nylon and 2 stamped steel washers on
each end of bedbar (Fig. 19).
