Lapping; Replacing The Bedknife - Toro ReelMaster 01005 Operator's Manual

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1. Bed knife
2. Reel blade
Note: After a reel has run for an extended period of time
the blade contact point or land area will keep getting wider
and eventually will be the full blade width. This is normal
and does not mean that the reel has to be reground to stay
effective. A cutting unit can cut effectively with full width
blades if the adjustment is checked frequently to maintain
sharp cutting edges.
After the reel and bedknife have been ground, perform the
following adjustments:
1. Set the Height–of–Cut
2. Parallel the Bedknife to the Reel
Note: As the reel blades continue to run against the
bedknife a slight burr will appear on the front cutting
edge surface 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.
If the reel blade edges and the bedknife edge are slightly
rounded and do not have severe nicks, lapping only
with a lapping compound may restore the edges and
match. Oftentimes a mower is deemed by users to need
grinding when the reel bearing adjustment, bedknife
adjustment and/or lapping is all that is necessary.

Lapping

Mowers are set up for lapping as follows:
1. Remove the right hand wheel.
2. Place the wheel under the gear case for support.
3. Remove the reel pinion cover (Figure 15).
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4
Figure 14
3. 15 - 20 degrees relief
angle
4. Land area established by
lapping
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1. Reel pinion cover
4. Disengage the reel.
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5. Connect the lapping machine coupler to the nut on
the end of the reel shaft.
When lapping, use a good grade of commercial lapping
compound. A medium grit should be for initial lapping
and a fine grit for finishing. A solution of one part
liquid detergent and two parts lapping compound is
recommended. The liquid detergent greatly eases
washing away the compound when finished. Water
soluble oil may also be used as a compound carrier.
Note: The lapping solution must be kept in free
flowing condition to get even distribution on the
bedknife and reel.
The lapping procedure is as follows:
1. Adjust the bedknife to the reel so light contact is
evident.
2. Operate the lapping machine so the reel turns in a
reverse direction. Apply lapping solution continuously
and maintain light bedknife to reel contact.
3. Stop the lapping machine periodically to check the
cutting surfaces for sharpness. Continue lapping until
the sharp cutting edges have been restored.
Note: If the cutting edges are severely rounded, both
sharpening and lapping may be required.
4. Wash off all the lapping solution. Using paper, check
for sharpness along the entire length of each reel
blade. If the paper cannot be cut cleanly along the
entire length of each reel blade, continued lapping is
necessary.

Replacing the Bedknife

1. To replace the bedknife, remove the eleven (11) screws
holding the knife to the bed bar; replace the knife and
reinstall the screws. All screws should be lubricated
with oil and torqued to 28.3 – 33.9 N-m (250–300
in.–lb). The screws should be tightened by starting at
the center of the bedknife and alternating until all the
screws are secured.
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Figure 15
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