Echo 74624 Owners Manual v.2 - Manual (Page 21)

19
SERVICE & MAINTENANCE
bEFoRE INSPECtINg oR SERvICINg aNy PaRt oF tHIS MaCHINE, SHut oFF PoWER SouRCE,
dISENgagE tHE HydRaulICS, oPEN SHIEld aNd MakE SuRE all MovINg PaRtS HavE CoME to a CoMPlEtE StoP.
Warning
5.2 removing chiPPer blades
the chipper blades will eventually become dull, making
chipping difficult. It is recommended that the chipper blades
are sharpened every 5-15 hours of chipper operation. to
remove the chipping blades for sharpening, use the fol-
lowing procedure:
Remove the two 3/8 inch retaining bolts holding access
cover to main frame assembly.
tilt access cover over to allow rotor access. the chip-
per will not operate when the cover is open. Rotate
the rotor so that the bolts holding the blades are most
accessible. to remove the inner blade, open the ac-
cess cover located on the top of the feed roller.
Remove the two allen head bolts holding the blade
itself. Repeat for all four blades. the four chipping
blades have two edges per blade and can be reversed
one time each before sharpening. If one side has not
been used, remove and reverse the chipping blades.
tighten bolts to proper torque and secure access
cover.
1.
2.
3.
the chipping blades are sharp!! use care when work-
ing on the machine to avoid injury.
depending on the type of wood fed into the chipper, the
blades will eventually dull, making if difficult to feed material
and produce chips. It is recommended that the blades be
checked for sharpness every 8 hours.
Regrind the angled edge of the chipping blades to 45
degrees (refer to figure below). 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.
try to remove an equal amount off of each blade to maintain
rotor balance.
Never sharpen or back grind the flat side of the chipping
blade. this will cause the edge to roll and the chipper blade
will be damaged, resulting in poor chipping performance.
Small imperfections such as nicks, burrs, etc. on the flat
side of the blade will not affect the chipping performance
of the machine.
When completed, replace the chipping blades and tighten
the bolts to 120 ft-lbs. Install all safety screens and guards
and resume chipping.
Warning
5.3 sharPening chiPPer blades
Inner blade
access cover Access
cover
Access
bolts
Sharpened
Surface
Sharpened Surface
Mounting Surface:
Do Not Grind
Mounting Surface:
Do Not Grind
.38
45°