Echo 7812086 Instruction v.2 - Manual (Page 2)

SHARPENING THE BLADES
the blades can be ground on a bench grinder or by a profes-
sional.
never sharpen or grind the mounting surfaces of the 1.
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
2.
degrees (see below). 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
3.
become overheated and change color. this will remove
the heat-treated properties.
Use short grinding times and cool with water or some
4.
type of liquid coolant.
remove an equal amount off each blade to maintain
5.
rotor balance.
Small imperfections such as nicks and burrs on the flat
6.
side of the blade will not affect the chipping performance
of the machine.
For blades that have been repeatedly sharpened, ensure
7.
that the sharpened surface extends past the chipping
slot opening. If it does not extend past the opening, the
blades should be replaced.
MOUNTING SURFACE
(DO NOT GRIND)
MOUNTING SURFACE
(DO NOT GRIND)
SHARPENED
SURFACE
SHARPENED
SURFACE
45°
.63
CHIPPER BLADE MAINTENANCE
the chipper blades will eventually become dull, making chip-
ping difficult and adding extra strain on the machine. CHECk
THE SHARPNESS Of THE BLADES EvERy 5 - 15 HOURS
Of OPERATION AND SHARPEN AS NEEDED.
Your blades need to be sharpened if:
•
machine vibrates severely when material is fed 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" (see below).
• The base of the cutting edge is worn or has been re-
sharpened so that it no longer extends past the chipping slot
(see below).
NEW
BLADE
CHIPPER
DISC
CHIPPING
SLOT
CHIPPER
DISC
BLADE IS
TOO SHORT,
MUST BE
REPLACED
CHIPPING
SLOT
NICK GREATER
THAN 1/8”
CRACK
GREATER
THAN 1/8”
BROKEN
CORNER
BLADE REPLACEMENT kIT (PN 73900-00),
MODEL CH123DH
PART # DESCRIPTION QTy
15770-00 WaSher, 5/8 Sae hardened 12
15776-00 BOlt, 5/8-11X3 Flthd SKt 12
15777-00 lOCKnUt, 5/8-11 SeCUrItY 12
74320-00 Blade 12 InCh ChIpper 4
BLADE REPLACEMENT kIT (PN 76297-00),
MODELS CH1236DH AND CH1238DH
PART # DESCRIPTION QTy
15294 WaSher, 3/4 Gr8 Sae 12
15835-00
BOlt, m20 X 2.5 X 50 heX hd W/
patCh
12
76178-00 Blade, threaded 5/8 ChIpper 4
ECHO BEAR CAT
www.bearcatproducts.com
237 nW 12th Street, West Fargo, nd 58078-0849
Phone: 701.282.5520 • Toll Free: 800.247.7335 • Fax: 701.282.9522
E-mail: [email protected] • [email protected]