Guidebar And Chain Assembly; Chain Tension - Homelite 150 Owner's Manual

CLUTCH DRUM AND SPROCKET
,i
OUTER PLATE
ouo,
"os
MOUNTING BOLTS
o.-
CHAIN ROTATION
@ e l
NUTS
TENSIONING PIN
DR]VEGASE COVER
HOLE IN BAR FOR TENSIONING PIN
TENSION ADJUSTING SCREW
CHAIN
PRE.SOAK CHAIN
I N L I G H T . O I L
of the'bar.
in.place with the two nuts -
finger tight to
adfustment of the chain tension.
GT''DEBA,R AND CHAIN ASSEMBD.
1. Belore doing anything else, presoak the chain by im'
mersing it in ligh-t oil, at least for 15 minutes and pre-
ferably overnight.
2. Remove the clutch cover to expose lhe chain drive
sprocket, guide bar mounting pad, and the two guide
b-ar platesl Keep the inner guide bat plate (the one
having an oil slot in it) on the mounling pad.
& Slb the guide bar onto the mounting bolts and-put
f,ltrler
Flate on over the bolts and against the bar.
4. Hold lhe cfrainin the approximate mounting posilion
The teeth should face in the
which is auvay from the
' ,Ir-.
6. toop and anqle the chain to slide lhrough the small
soaie between'the clutch drum and the sawdust
sirlela (at about the 11 o'clcck position relative to
the clutbh). Fit the chain ovpr the clutch and onto the
sprocket.-Then begin at the sprocket !o feed the
d'rive links into'the top bar groove' continuing on
.
around the bar nose until the chain is onllhe bar'
6. Turn the tenbion adiustment screw in the clufch cover
tc place the tension-adiusting
pin where it wift engage
tn6 hole in thg guide bar when the cover ris put in
t l';ffi" .ou"{onthe b6tts asainst tt " out"rL#plate "
'' €nd make sure tlle pin is in the hole. Hold assembly
in.place with the two nuts -
finger tigl-tt to permit
CHAIN TEttlSlON
The proper amoiunt ol chain tension depends on the'
length and type ol guide bar used. The instructions given
here are correct for all lengths of bars up to 20 inches.
The lension for hard-nose bars must be looser than that
for sprocket nose bars.
the chain along the bar and make the tension so that
the chain is snug against the bar without causing
b i n d i n g b u l c a n s t i l l b e p u l l e d a r o u n d t h e g u i d e b a r
by hapd.
When hot from operation, the chain may sag away
from the bar a bit, but this sag should not be allowed
to exceed Va" as measured in method A. This applies
to either type of bar nose.
When adjusting the chain tension, always hold up the
tip of the bar lo take up any play between the bar
mounting slot and the mounting bolts. Keep the nose
up until iension has been set and the mounting nuls
tightened to lock the bar at that tension.
After setting tension, pull the chain along the bar
several time-s, then reiheck the tension as this"may
have relieved some of the stiffness in the new chaial
a n d b a r a s s e m b l y .
t
Start and run the engine at part throttle so the chain
rotates slowly around the bar. Alter one or two min-
utes, stop engine and readiust tension if chain is now
too loose.
Now the chain and bar assembly is ready for culting'
But after each few cuts you will find the new chain
loose and again in need of tensioning. However, this
"stretching'i of new chain will slow up and virtually
cease aftei the first half-hour or so of cutting.
TH E C HAI N TEN SIO N IS C OR R EC T !
2.
METHOD "A''
(measure
hang-down
distance)
== l(rt, min'. r/a,,max,
METHOD "B''
PULL CHAIN
BY HAND
TO FEEL
T H E T E N S I O N
1. The tension'cah be gauged in two ways. METHOD A
FOR HARD'NOSE BARS: measure the "hang-down" 6.
distance &t its loosest pointbetween the chain tie
strap and the bar rail at the middle ol the chain span
as shown in drawing; METHOD B FOR SPROCKET
NOSE BARS: using a glove or rag lor protection, pull
N O TE : D O N OT MAKE ANY CUTS UNL ESS
l '