Sharpening Blades - Jacobsen 67862 Parts & Maintenance Manual

4.21 SHARPENING BLADES _____________________________________________________

1. Place a wooden block between the blade and mower
housing to stop the blade from moving. To remove
blade on left wing and center decks, turn screw
holding blade counterclockwise. To remove blade on
right hand deck, turn screw holding blade clockwise.
!
The mower blades can develop sharp edges. Use
caution whenever servicing and handling.
2. When dressing or sharpening the blade, do not
follow the original pattern of grind as shown in (A).
Grind new cutting edges at an angle as shown in
(B).
If the maximum total loss of the blade reaches 1/2 in.,
(13 mm), do not sharpen further, replace blade.
!
Resharpening the blade beyond the allowable
1/2 in., (13 mm) may allow blade tip break off and
be thrown from the mower. Such an incident can
cause very serious injury to bystanders and/or
property damage.
3. Make sure an equal amount of material is removed
from both sides of blade to prevent having an
unbalanced blade. An unbalanced blade will cause
excessive vibration and may damage the mower.
4. Use a blade balancer to check the blade after
sharpening.
5. Attach blade to mower. Install blades so cutting
edges (C) face the direction of rotation as shown in
Figure 4G. Beveled cutting edge of blade must face
in toward deck housing.
IMPORTANT: The two right hand blades (D) must be
installed on the right wing deck using left hand threaded
hardware. The remaining left hand blades (E) are
mounted on the left wing and the center deck using right
hand thread hardware.
Torque center mounting screw holding blade to 75 to 90
ft. lb. (100 to 120 Nm).
WARNING
WARNING
MAINTENANCE
A
B
Note LH
Threads
Left Wing
Bottom view of wing decks
in their transport position
Bottom view of center deck.
C
Installation
Direction
E
Maximum
1/2" (13 mm)
Figure 4F
E
Right Wing
E
E
Figure 4G
D
C
C
Figure 4H
4
HR024
D
C
21