Sharpening Blades - Jacobsen R-311T Handbuch

4.3

SHARPENING BLADES _____________________________________________________

1. Place a wooden block between the blade and mower
housing to stop the blade from moving. To remove
blade, turn screw holding blade counterclockwise
WARNING
!
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.
WARNING
!
Resharpening the blade beyond the allowable 1/2 in. (13
mm) may allow blade tip to 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 (JAC 5016) to check the blade
after sharpening.
5. Identify the three clockwise rotation (D)
counter-clockwise rotation (E) blades. The blades for
clockwise rotation are installed on the left front deck
motor, the outside left wing deck motor, and the inside
right wing deck motor. (Rotation is determined by
normal motor rotation viewed from top of deck).
6. Install blades so cutting edges (C) face the direction of
rotation as shown in Figure 4C. Air vane of blade must
face in toward deck housing.
Torque center mounting screw holding blade to 75 ft. lb.
(102 Nm).
.
and four
MAINTENANCE
A
Maximum
1/2" (13 mm)
B
C
C
C
E
E
D
Bottom view of front deck
in its service position
C
D
E
Left Side
C
E
D
Right Side
Bottom view of side decks
raised to their transport position.
4
HR024
Figure 4B
Figure 4C
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