Echo 77412 Owners Manual v.1 - Manual (Page 18)

Page 16 4.5" BearCat Chipper Operator's Manual
Section
Service and Maintenance
5
WARNING
Before inspecting or servicing any part of the machine,
shut off the power source, disconnect the spark plug wire
from the spark plug and make sure all moving parts have
come to a complete stop. The chipping blades are sharp!
Use care when working on the machine to avoid injury.
5.1 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 rotor 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 5.1).
3. Install a punch or screwdriver into the holes.
5.2 SHARPENING CHIPPER BLADES
When the chipper blades dull, chipping becomes difficult. It
is recommended that the chipper blades are sharpened ev-
ery 5-15 hours of chipper operation. Follow the steps below
to sharpen the chipping blades.
1. To remove the chipper deflector from the chipper hous-
ing, remove the two 3/8" x 5-1/2 bolts securing the de-
flector to the chipper housing and loosen the 5/6" flange
nuts on the weldment bolts. Remove the deflector.
2. Install the disk lock (Section 5.1). The disk is now re-
strained for removing the blades. To access the remain-
ing blades, 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" x 1-3/4" flat head screws holding
the blade to the disk.
4. When sharpening the blades, be sure to maintain the
original 45 degree angle. Be careful when grinding so
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 wa-
ter. Remove an equal amount off each blade to maintain
balance.
5. Reinstall blade and torque to 75 Ft-lb. Repeat this pro-
cedure for each blade.
Figure 5.2 - Chipper Blade Surfaces
NOTE
One of the 3/8" x 5-1/2" bolts from removing the chipper
deflector can also be used to lock the disk.
Figure 5.1 - Disk Lock
Chipper Disk
Disk Lock Hole
Matching hole on
Disk Paddle
WARNING
The chipping blades are sharp! Use care when working
on the machine to avoid injury.
NOTE
The chipper blades consist of two edges (Figure 5.2).
When the first edge dulls, flip the blade and torque to 75
Ft-lb to use the second sharp edge. After both edges are
dull, sharpen the chipper blades.