Echo 73413 Owners Manual v.2 - Manual (Page 17)

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To adjust:
1. Lift rotor access cover and expose rotor. Loosen the two 1/2 inch bolts
that hold the chipper anvil to the frame (see figure 5).
2. Measure the amount of clearance between chipping blade and chipper
anvil from inside of housing.
3. Adjust inward or outward to desired measurement using the nuts on the
adjustment bolt.
4. Tighten bolts on chipping block to 75 ft. lbs. and resume operation.
Remove the two bolts holding the anvil and use one of the other three edges
if the chipper anvil edge is damaged or worn unevenly. Adjust for correct
measurement.
• Be careful when grinding so that the blade material does not get too hot
and change color if you use a bench grinder–this will remove the
blade's special heat treated properties.
• Use short grinding times and cool with water.
• Try to remove an equal amount off each blade to maintain balance.
5. Replace the chipping blades and tighten bolts to 20 ft. lbs.
6. Close cover and replace bolts.
Chipping Blade Sharpening Tips
Poor chipping performance is usually a result of dull chipping blades. Check for the
following symptoms if your chipper performance has decreased:
• Severe vibration when feeding material into the chipper.
• Small diameter branches do not self-feed.
• Chips discharge unevenly or have stringy tails–especially when chipping green
branches.
Check for permanent damage before sharpening the chipping blades. Replace the blade
if:
• The blade is cracked (especially around the bolt holes) or the edges are too deeply
chipped to be ground smooth.
• The base of the cutting edge is worn or has been re-sharpened so that it is too close
to the rotor chipping slot.
Setting Chipping Blade Clearance
The four chipping blades should clear the chipper anvil located directly under the
chipper chute by 1/16 inch to 1/8 inch. The chipper anvil is adjustable and reversible.
Service and Maintenance-Cont.
Never grind on the
back side of the
chipper blade.