How And When To Set Depth Gauge Clearance; Maintenance Of Guide Bar And Sprocket - Homelite 150 Owner's Manual

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Every third or fourth time the teeth are sharpened, or if
a large amount of steel is removed from the cutters, lhe
depth gauges should be filed to correct depth. Use a
depth gauge jointer and a flat lile, both of which are
available from your dealer. After filing gauges to proper
depth, round off the front third of all gauges uniformly to
facilitate smooth entry of gauges into the cut.
Depth gauges control the size chips the teeth can cut. A
tooth with a "high" gauge cannot bite, and a chain that
cannot get a good bite requires too much feed pressure.
On the olher hand, setting gauges so low that the chain
takes too large a bite causes it to grab and jerk during
cutting. The depth at which you should keep the gauges
depends upon the type ol chain and the type of wood
you cut. New 3/a/' pitch chains have gauges lactory set
to .025" depfh for a mixed hardwood-softwood diet. lf
you cut mostly soflwood, you may find that a depth of
.030/' js more satislactory.
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CHECK DEPTH GAUGE SETTING
SHAPE OF DEPTH GAUGES:
ORIGINAL AND CORRECT CONTOUR
WRONG: TOO BLUNT TO FEED SMOOTHLY
WRONG: NOT ENOUGH STRAIGHT SECTION
LEFT TO ACT AS DEPTH GAUGE.
THE SPROCKET must always match the chain in pitch.
the pitch. Always either change the
ver you install a new chain, or be sure
llig-ttfrl sprocket is still ln "like new" condition. The
sprocket bearing should be cleaned and lubricated with
fight film ot #24551ALL-TEMP Multi-Purpose GREASE at
TOOTH WEAR PATTERN
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NEEDIE
RACE
BEARING
CLEAN BAR SLOT
WEAR PATTERNS IN GUIDE BAR GROOVE AND BAR RAILS:
1. PERFECT 2. UNEVEN 3. SURRED 4. WOFN FROM 5. SPREAD 6. SHAI-LOW
HEtcHT
TOO LOOSE
RAILS GROOVE;
CHAIN
cRtr{D
DEEPER
least every lfl) operating. hours. Sproqket and clutch
wt
cen be done by your dealer, or you can purchase
lf necessary tools and a Pictorial Service Guide (see
order blank) and do the service work yourself,
IllE BAB should be kept ctean. Examine it periodicaily.
With a-flal file, remove any burrs that occur along the
bar rails, because burrs interfere with cutting. pinching
in-3 9_ut, loilng excessively with the nose, a-nd runnin!
with the chain too "dri"r too tight, or too loose all resui-t
in excessive bar wear and damage. lt is possible to
straighten bent bars, close bar rai-ls, regrind itneveily
worn _rails, and deepen the bar groove. When the rail3
have been worn or ground down, check for chain clear-
alrce in the bar groove: il the chain hits bottom.any-
where, check with your dealer to see whether the bir
can be reconditioned or must be replaced.
SPROCKET NOSE GUIDE BARS are designed to ailow
replacement of the nose sprockel NOTE: When saws
are used for heavy wood cutting and land clearing, the
sprocket nose requires lubrication every second oithirA
fueling, To change the nose sprocket, drill lhrough cen-
ters of the rivet heads and punch out the old rivbts. In-
stall the new sprocket assembly just as it comes lrom
the replacement nose kit. When installing new rivets,
peen the heads out smoothly with light taps, then strike
several blows with flat head of the hanimer until the
rivets fill up the holes.
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SPROCKET
SPROCKET NOSE BAR
RIVETS AND OLD/
N O S E R E M O V E D
SLIDE REPLACEMENT
SPRO.CKET INTO PLACE
RIGHT OUT OF KIT
PACKAGE
CHAIN DRIVE LINKS MUST HAVE SHARP
POINTS TO CLEAN SAWDUST FROM AAR
GROOVE, AND GROOVE MUST 8E DEEP
ENOUGH FOR DRIVE LINK TO CLEAR ALL
THE WAY AROUND BAR.