Installing The Disk Lock; Chipper Blades - Echo 77412 Owner's Manual

SERVICE & MAINTENANCE
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.

4.2 inSTalling The diSk lock

When working on the disk assembly, use the lock
mechanism at all times (Figure 23). Follow the steps below
to install the disk lock:
1. Remove the chipper deflector.
2. Rotate the chipper disk until the hole on the chipper
paddle is aligned with the hole on the chipper housing
(Figure 23).
3. Install a punch or screwdriver into the holes.
noTe
One of the 3/8" x 5-1/2" bolts from the chipper deflector
can also be used to lock the disk.
Figure 23, Disk lock

4.3 chiPPer bladeS

Warning
Chipping blades are sharp! use caution when working
on machine to avoid injury.
The chipper blades will eventually become dull, making
chipping difficult and adding extra strain on the machine.
poor chipping performance is usually a result of dull
chipping blades. It is recommended that the blades
be sharpened every 5-15 hours, or if your chipper's
performance has decreased. Check for the following
symptoms and sharpen the blades if needed:
24
Warning
1. Severe vibration when feeding material into the chip-
per.
2. Small diameter branches do not self-feed.
3. Chips discharge unevenly or have stringy tails, espe-
cially when chipping green branches.
Before you sharpen the chipping blades, check for
permanent damage. Replace the blade if:
1. There are cracks, broken corners or nicks greater than
1/8" (Figure 24).
2. The base of the cutting edge is worn or has been re-
sharpened so that the edge extends less than 1/16"
above the rotor chipping slot.
4.3.1 removing The bladeS
1. Remove the chipper deflector from the chipper hous-
ing by removing the two 3/8" x 5-1/2 bolts securing
the discharge cap or optional discharge tube to the
chipper housing and loosening the 5/6" flange nuts
on the weldment bolts. Remove the discharge cap or
optional discharge tube.
2. Install the disk lock (Section 5.2).
restrained for removing the blades. To access the
remaining blade, remove the punch or screwdriver,
reposition the disk and return the punch or screwdriver
to the disk lock hole.
3. Remove the two 1/2" security lock nuts (on back side
of chipper disk) and the two 1/2" x 1-3/4" flat head
screws holding the blade to the disk. Repeat for the
remaining blade.
4. Inspect blades to see if cracks or nicks are visible.
If cracks are present, replace the blades. Replace
the blade if nicks cannot be removed by sharpening.
Tighten screws to 120 ft-lbs.
4.5 INCH CHIPPER
Figure 24, Causes for replacement
The disk is now