Echo 77412 Owners Manual v.3 - Manual (Page 20)

Crary Bear Cat Owners Manual 18
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.
WARNING
5.3 CHIPPER BLADES
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.
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.
Before you sharpen the chipping blades, check for permanent
damage. Replace the blade if:
There are cracks, broken corners or nicks greater than 1/8"
(Figure 5.2).
The base of the cutting edge is worn or has been re-sharp-
ened so that the edge extends less than 1/16" above the
rotor chipping slot.
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2.
3.
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2.
5.3.1 REMOVING THE BLADES
Remove the chipper deflector from the chipper housing by
removing the two 3/8" x 5-1/2 bolts securing the deflector to
the chipper housing and loosening the 5/6" flange nuts on
the weldment bolts. Remove the deflector.
Install the disk lock (Section 5.2). The disk is now restrained
for removing the blades. To access the remaining blades,
remove the punch or screwdriver, reposition the disk and
return the punch or screwdriver to the disk lock hole.
Remove the two 1/2" security lock nuts (on back side of chip-
per disk) and the two 1/2" x 1-3/4" flat head screws holding
the blade to the disk. Repeat for the remaining blades.
Inspect blades to see if cracks or nicks are visible. If cracks
are present, replace the blades. If nicks cannot be removed
by sharpening blade, replace the blade.
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2.
3.
4.
WARNING
Chipping blades are sharp! Use caution when working on
machine to avoid injury.
Figure 5.2 - Causes for Replacement
5.2 INSTALLING THE DISK LOCK
When working on the disk assembly, use the lock mechanism
at all times (Figure 5.1). Follow the steps below to install the
disk lock.
Remove the chipper deflector.
Rotate the chipper disk until the hole on the chipper paddle is
aligned with the hole on the chipper housing (Figure 5.1).
Install a punch or screwdriver into the holes.
1.
2.
3.
NOTE
One of the bolts from removing the chipper deflector can also
be used to lock the disk.
Figure 5.1 - Disk Lock
MATCHING HOLE ON
DISK PADDLE
CHIPPER DISK
DISK LOCK HOLE