Echo 74554 Owners Manual v.3 - Manual (Page 15)

11 5 INCH CHIpper
SERVICE AND MAINTENANCE
To remove the chipping blades for sharpening:
Remove the one 3/8 inch retaining bolt holding the ac- 1.
cess cover to main frame assembly (see Fig. 5.1).
Tilt access cover over to allow rotor access. Rotate 2.
the rotor so that the bolts holding a chipping blade are
most accessible.
Remove the two hex bolts holding the chipper blade.
3.
Repeat for all four chipper blades. 4.
Before inspecting or servicing any part of the machine,
shut off the engine, and make sure all moving parts have
come to a complete stop. The chipping blades are sharp!
Use care when working on machine to avoid injury.
Warning
Figure 5.2 Sharpening the blades
The chipping blades should clear the chipper anvil (located
directly under the chipper chute) by 1/16 inch to 1/8 inch.
To adjust the blade clearance, proceed as follows:
1. Lift rotor access cover and expose rotor. Loosen the
two 1/2 inch bolts that hold the chipper anvil to the
frame.
2. Measure the amount of clearance between chipping
blade and chipper anvil from inside of housing. The
gap should be 1/16" to 1/8".
3. Adjust inward or outward to desired measurement.
Use the nuts on the adjustment bolt (See Fig. 5.3).
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.
Figure 5.3 Chipper blade and anvil clearance
5.3 removing CHiPPer blades
5.5 seTTing blade ClearanCe
The four chipping blades have two edges per blade and
can be reversed one time each before sharpening (see
Figure 5.2). Remove and reverse the chipping blades if
both sides have not been used. Reinstall chipping blades
and proceed with chipping.
before you sharpen the chipping blades, check for
permanent damage. replace the blade if:
1. The blade is cracked (especially around the bolt holes)
or the edges are too deeply chipped to be ground
smooth.
2. The base of the cutting edge is worn or has been re-sharp-
ened so that it is too close to the rotor chipping slot.
If blades need sharpening, grind the angled edge of the
chipping blade to 45 degrees. grind the blades on a slow-
speed wet grinder if possible, or have them sharpened
by a professional. If you use a bench grinder, be careful
when grinding so that the blade material does not get too
hot and change color–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. Reinstall.
5.4 sHarPening CHiPPer blades
Figure 5.1 Access bolt