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JACOBSEN AR3
SAFETY, OPERATORS & MAINTENANCE MANUAL
9 ADJUSTMENTS
9.5 BLADE SHARPENING
Blades may be sharpened by filing or grinding.
When sharpening, maintain blade balance within
19.4 g/cm (5/8 oz/in). Failure to keep the blade
balanced causes excess vibration, blade wear and
shortened blade life, and may harm other
mechanical components of the machine as well.
To check blade balance
1. Determine if there is a lighter end.
2. Attach a 3.9g (1/8 oz) weight to the lighter
end 127mm (5in) from the centre of the
blade.
3. If the blade is adequately balanced, the
weight should convert the light end into
the heaviest end. If correction is required,
file or grind the heavy end to obtain
balance.
9.4 BLADE CHANGE
NOTES:
• Do not overheat or weaken blades when
sharpening.
• Do not straighten bent blades.
* If the lift portion of the blade is worn thin,
replace with a new blade.
• Replace cracked or bent blades.
• For greatest safety always use genuine
replacement blades .
Blades are extremely sharp and can cause
severe cuts. For your protection, hold
blade with thick leather work glove only.
1. Remove blade bolt (A).
2. Remove blade (B) from deck .
3. Fit new blade.
3. Replace blade assembly to hydraulic motor
spindle.
4. Tighten blade bolt with torque wrench (C)
set to 95N-m (70 ft-lb) torque.
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