Toro 03485 Operator's Manual page 15

Checking and Adjusting the
Cutting Unit
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.
Prior to mowing each day, or as required, check each
cutting unit to verify proper bedknife-to-reel contact.
This must be performed even though the quality
of cut is acceptable.
1. Slowly rotate the reel in a reverse direction,
listening for reel-to-bedknife contact.
Note:
The adjustment knobs have detents
corresponding to 0.018 mm (0.0007 inch)
bedknife movement for each indexed position.
Refer to Adjusting the Bedknife to the Reel
(page 8).
2. Test the cutting performance by inserting a
long strip of cutting performance paper (Toro
Part 125-5610) between reel and bedknife,
perpendicular to the bedknife
rotate the reel forward; it should cut the paper.
Figure 20
Note:
If excessive contact/reel drag is evident
it will be either necessary to backlap, reface the
front of the bedknife, or grind the cutting unit to
achieve the sharp edges needed for precision
cutting (Refer to the Toro Manual for Sharpening
Reel and Rotary Mowers, Form No. 09168SL).
Important:
Light contact is preferred
at all times. If you do not maintain light
contact, the bedknife and reel edges will
not sufficiently self-sharpen and will dull
after a period of operation. If you maintain
excessive contact, the bedknife and reel will
wear quicker, wear unevenly, and the quality
of cut may be adversely affected.
(Figure 20). Slowly
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Note:
After extended running, a ridge will
eventually develop at both ends of the bedknife.
Round off or file these notches flush with the
cutting edge of the bedknife to ensure smooth
operation.
Note:
Over time, you will need to grind the
chamfer (Figure 21), as it is only designed to last
40% of the bedknife life.
Figure 21
1. Lead-in chamfer on right
end of bedknife
2. 6 mm (0.25 inch)
Note:
Do not make the lead-in chamfer too
large, as it may cause turf tufting.
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3. 1.5 mm (0.060 inch)