Toro 03781, Руководство по обслуживанию

Страница: 375 / 468

Reelmaster 7000--D
DPA Cutting Units
Page 9 -- 21
Bedknife Grinding
Since there can be variations in the mounting surface of
the bedbar, it is necessary to grind the bedknife after
installing it to the bedbar. Follow the bedknife grinding
specifications provided and grind only enough to make
sure the top surface of the bedknife is true (Fig. 28
and 29).
IMPORTANT: Do Not grind the bedknife below it’s
service limit (Fig. 30). Operating the cutting unit with
the bedknife below the service limit may result in
poor after--cut appearance and reduce the structur-
al integrity of the bedknife for impacts.
When grinding the bedknife, be careful to not overheat
the bedknife. Remove small amounts of material with
each pass of the grinder. Also, clean and dress grind-
ing stone often during the grinding process.
NOTE: EdgeMax
R
bedknives are extremely hard. Us-
ing a diamond grinding wheel is recommended to pre-
vent overheating or damaging the bedknife edge while
grinding.
Because the top grind angle on bedknives is critical for
edge retention, and therefore after--cut appearance,
Toro has developed special service tools for accurately
measuring the top grind angle on all bedknives; refer to
the Angle Indicator and Magnetic Mount in the Special
Tools section of this Chapter.
NOTE: Some bedknives were produced with a 5
_
top
angle. Use a 10
_
top angle when regrinding all
bedknives.
Bedknife Grinding Specifications
Bedknife
Lip Height
Service
Limit
Top
Angle
Front
Angle
EdgeMax
Low HOC
0.19”
(4.8 mm)
10
_
5
_
Premium
Low HOC
Standard
Low HOC
Extended EdgeMax
Low HOC
10
_
Extended
Low HOC
EdgeMax
Standard HOC
5
_
Standard
Standard HOC
Heavy Duty
Standard HOC
Figure 28
Top
Front Angle
Top
Remove Burr
(without dulling
Angle
Surface
sharp corner)
Figure 29
Service Limit
0.19”
Lip Height
(4.8 mm)
1. Bedknife
Figure 30
1. Bedknife 2. Lead --in Chamfer
Figure 31
1
2
0.25” (6.4 mm)
0.06”
(1.5 mm)
1. Use Toro General Service Training Book, Reel Mow-
er Basics (part no. 09168SL) and grinder manufactur-
er’s instructions for bedknife grinding information.
2. A lead--in chamfer is ground into all new bedknives
(Fig. 31). The original chamfer should last for the first
40% of the bedknife service life. Check and re--grind the
lead--in chamfer as necessary.
3. After bedknife grinding is complete, install bedbar to
cutting unit (see Bedbar Installation in this section).
DP
A
C
utting
Units