SECTION 6-MAINTENANCE
8
ADJUSTMENT
HOMELITEB SAW CHAIN
LEFT HAND
DEPTH GAUGE
/
RIGHT HAND CUTTER
CUTTER
-
/
\.
/
RIVETS
/
TIE-STRAP
Saw chain is identified by a number stamped on either its
tie-straps or its drive links. You may select any chain
stamped "375" or
"37." Do not usechainsof other number
series such as "25" or "38" as they will be of either the
wrong pitch for your sprocket, or the wrong configuration
for your saw. The original chain supplied with your saw
was either Type 37 Saw Chain or 375 Saw Chain. Which-
ever of these chains you choose in replacement, be sure
to use our sprocket and drum assembly #A-70221-A
which fits both types.
FILING EQUIPMENT
Purchase our assembly #DA-92617 which consists of a
file holder and a 5/32"
(4mm) diameter "fast-cut" round
file
(#92604). When about half to 5/8 of the tooth steel has
been filed away, you should switch to a
1/8" (3.2 mm) di-
ameter file
(#92605). The 1/8" diameter file fits into the
same file holder. The reason for switching to a smaller di-
ameter file on "short-filed" teeth is that they are reduced
in height due to their tapered top plate configuration.
You will also need a depth gauge tool
(.020" or 0.5 mm,
#D-92630) and a flat file
(#92609).
HOW TO FILE THE CUTTERS
If you do not have a chain filing vise you can do a satis-
factory job "on the bar" if you tighten the chain tension
enough that the chain doesn't wobble. And, do all of your
filing at the mid-point of the bar. Wear gloves for protec-
tion. Be sure to file all cutters to the same length. This
must be done because of the taper of the teeth; if some
cutters are shorter than others only the longer cutters will
get a chance to cut. Also be careful to file all cutters to the
specified angles, as fast cutting can be obtained only
when all cutters are uniform. Each cutter then gets a
chance to cut.
1. Hold file against cutter face at
a35O angle. (It is marked
on the holder.)
2. Keep the file level with the tooth top plate. Do not let file
dip or rock.
3. File in one direction only
-
towards front cornerof the
tooth. Move file away on the return stroke.
35" GUIDE MARK
ON HOLDER
CHAIN TRAVEL
4.
Use light but firm pressure, mostly towards back of
tooth. Avoid heavy downward pressure. The holder will
keep
10O/0 to 20% of the file diameter above the cutting
edge IF YOU LET IT. This will produce the desired bev-
eled hollow-ground under-edge automatically.
5.
Put a few firm strokes in every tooth, filing all cutterson
one side, then those on the other side of the chain. Ro-
tate file in holder occasionally.
6. Examine your filing job in strong light. A sharp edge
will not reflect light and a dull edge will. However,
sharpening does not alone make a good cutting tooth.
An abraded tooth, for instance, may still not cut until
you have removed the worn or rounded off portion of
the steel so that the sharp cutting edge is the highest
part of the chain. In other words; the edge and not the
flat
plate
of the cutter has to contact the wood first (see
"Filing Out Skid-Nose Wear Pattern", page 17).
NOW EXAMINE YOUR FILING JOB-
HERE'S WHAT YOU SHOULD GET:
2.
Beveled under edge.
I
1.
35" top plate angle.
LINE OF CHAIN TRAVEL-
--
3. Side plate 85" to line of chain travel.
EDGE MUST BE HERE ON KERF LlNE
1(
KERF LlNE
EDGE MUST NOT BE HERE
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