Chipper Blades (Cont.) - Echo 77412 Owner's Manual

BEFORE INSpECTING OR SERvICING ANy pART OF THIS mACHINE, SHuT OFF pOWER SOuRCE,
DISCONNECT SpARk pLuG WIRE FROm SpARk pLuG AND mAkE SuRE ALL mOvING pARTS HAvE COmE TO A COmpLETE STOp.

4.3 chiPPer bladeS (conT.)

4.3.2 SharPening The bladeS
To grind the angled edge of the chipping blade to 45
degrees (see Figure 25): 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 from each blade to
maintain balance. Replace the chipping blades and tighten
screws to 120 ft-lbs. Close cover and replace bolt.
Figure 25, Double edged blade
4.3.3 inSTalling The bladeS
1. Lock disk assembly (Section 4.2).
2. place a blade on the disk and attach using two 1/2" x
1-3/4" flat head screws and two 1/2" security lock nuts.
Torque the 1/2" security lock nuts to 120 Ft.-lb. Repeat
for the remaining blades.
3. Reinstall the chipper discharge cap or optional dis-
charge tube (Section 2.3).
4.3.4 SeTTing chiPPing blade clearance
The chipping blades should clear the chipping anvil, located
directly under the chipper chute, by 1/16" to 1/8". Removing
the chipper chute is noT required for setting the chipping
blade clearance. However, removing the chipper chute
can provide better access for measuring the chipping
blade clearance. To adjust the blade clearance, proceed
as follows:
1. Rotate the disk until a chipping blade is even with the
chipping anvil.
2. measure the amount of clearance between the chip-
ping blade and chipper anvil from inside of the chipper
housing. The minimum distance between the chipping
blade and the chipping anvil should be 1/16" (Figure
26).
Warning
It is important to ensure that the minimum gap between
the chipping anvil and ALL chipping blades is 1/16". All
chipping blades should be rotated until even with the
chipping anvil and then measured. Failure to do so can
result in the chipping blades striking the chipping anvil,
causing serious injury or death.
3. Adjust the anvil by loosening the 5/16" x 5/8" bolts
holding the anvil to the disk cover and sliding the anvil
inward or outward until the desired measurement is
achieved.
4. Torque the bolts to 17 Ft-lbs.
5. Rotate the rotor to ensure the remaining blade clears
the anvil by 1/16" to 1/8".
6. If the chipper chute was removed, reinstall it.
If the chipping anvil edge is damaged or worn unevenly,
remove the three 5/16" bolts and washers holding the
anvil to the disk cover and use one of the other three
edges. Adjust for correct measurement.
Figure 26, Chipper blade and anvil clearance
4.5 INCH CHIPPER
SERVICE & MAINTENANCE
Warning
noTe
25