Echo 74500 Owners Manual v.4 - Manual (Page 18)

5" and 8" Skid Steer Chipper Owner's Manual 16
SERVICE & MAINTENANCE
BeFOre iNSPeCtiNg Or ServiCiNg aNy Part OF tHiS MaCHiNe, SHut OFF POWer SOurCe,
diSeNgage tHe HydrauliCS aNd Make Sure all MOviNg PartS Have COMe tO a COMPlete StOP.
Warning
disconnect the hydraulic hoses from the skid steer.
Position the discharge chute to the side of the chipper.
remove the two bolts on the chipper housing.
tip the chute and housing away from the chipper to
expose the rotor and the blades.
use a pry bar between two of the fan blades to prevent
the chipper from rotating during blade removal and
installation.
remove the blades making sure not to slip the wrench,
the chipper blades are sharp.
the chipper blades are reversible. if the blades have
not been reversed, flip the blades 180 degrees and
reinstall.
if the chipper blades need to be sharpened refer to
Section 5.4 of the manual.
inspect all components of the chipper for damage and
replace if necessary.
1.
2.
3.
4.
5.
6.
7.
8.
9.
Never sharpen or grind the mounting surfaces of the
blades. this will cause the edge to roll and the blade will
be damaged, resulting in poor chipping performance.
regrind the angled edge of the chipping blades to 45
degrees (Figure 5.2).
the blades can be ground on a bench grinder or by
a professional.
Make sure some type of fixture is used to correctly hold
the blade at the proper angle.
Be careful when grinding so that the blade does not
become overheated and change color. this will remove
the heat-treated properties.
use short grinding times and cool with water or some
type of liquid coolant.
remove an equal amount off each blade to maintain
rotor balance.
Small imperfections such as nicks and burrs on the
flat side of the blade will not affect the chipping per-
formance of the machine.
For blades that have been repeatedly sharpened,
ensure that the sharpened surface extends past the
chipping slot opening. if it does not extend past the
opening, the blades should be replaced.
•
•
•
•
•
•
•
•
•
Figure 5.2 - Double Edged Blade
Model 74500
MOUNTING SURFACE
DO NOT GRIND
SHARPENED
SURFACE
SHARPENED
SURFACE
DO NOT GRIND
MOUNTING SURFACE
.25
45˚
MOUNTING SURFACE
DO NOT GRIND
MOUNTING SURFACE
DO NOT GRIND
SHARPENED
SURFACE
SHARPENED
SURFACE
45˚
.38
Model 74800
5.3 removing The blades 5.4 sharPening The blades