Shindaiwa 300 User manual

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sERVICE
MANUAL
Shindaiwa
Chain Saws
sh i ndaiwa

Service Manual
Shindaiwa Chain Saws
\.
Contents Section
page
Model Designation and Identification .. 3
2 Troubleshooting . ................... ... .... 6
3 Carburetors
.. . 22
Operation . ...... 22
Adjustment. . .. . .. . .. 24
Servicing ... .... ....... ... ... ............. ... . .. . .. 27
4 Recoil Starters . . ... . 40
5 Ignition Systems . ......
46
Troubleshooting . . .. ... ..... ... .. ..
.. 49
6 Clutches
... ... . . . ...... .. . 60
7 Cylinders and Pistons ............. .. . ... ... ... 70
8 Engine Crankcase ......... .. . .. ..80
9 Mufflers ....... 92
10 Chain Brakes . .
.. 98
11 Oil Pumps . 108
12 Rear Handles and AJV Cushions ........ 114
13 Model 357 Top Handle Saw ... 118
14 Appendix
.. 128
Speclfications
.... ... .. ....... ... .. ..
.
.. 128
To r que Values . . ... ..... 130
Metric Conversions ............ . .
.... 131
To lerances and Wear Lim it s ...... .. ..... .... 132
Fuel
and O il . .
... 134
Special Service
To ols . . ... 136
~ Shindaiw Inc. 1995

Attention Statements
Throughout this manual are statements
surrounded by boxes and preceded by
special symbols
AWARNING!
A stalement preceded by lhe word
"WAR NI NG " contains information ¡hat
shoul be acted upon
to prevenl serious
bodlly Injury.
o ATT ENTI ON!
A statement preceded by the word
"A
TIE NTI O N" contains in ormation that
should
be acted upon to avoid damaging
the
saw
Addilional stalements lhat are no ! preceded
by symbols are:
IMPORTAN T!
A slalemel lt preceded by "IMPORTANT" IS
one lhal possesses special significance.
2 e IHnda'wi'l Ine. 1995
)

Model Designation and Identificat ion Section 1
Specllicallons iJ . ~Cl ; o c~a~ge \' lllhoulncll"
Chain Saws
't"lodeI300
Mode/300S
Model360
M del377
9 S hmdaiwa I l1e . 1995 3

Section 1 Model Designation and Identification
Speclf,callOns sub¡eCIIC c"anQ" <,' 1IIoul noll:e
Chain Saws
MOcle/488
Model575 (680 and 695 similar)
Mode/577
e Shlfldaiwa ¡ne , ' 5
4

Model Designation and Identif i cat ion Section 1
SpeCilicalions subjecll hange wilh u ~otlce
Chain Saws
lode/757
shindaiWa
Mode/357
e Sh,nd~,\·)a lroe . 1995 5

Section 2 Troubles hooti ng The 2-Stroke Cycle Engine
Theory 01
Operation
Figures 2. 1 and 2 2
A two-stroke cycle or
"two-cycle" engine
produces one
power
stroke for every
revolution
of its
crankshaft. Intake
and compression
occur during the
piston's "up" stroke;
power and exhaust
occur during the
"down" stroke.
Six distinct pro-
cesses occur during
every revolution
of
the crankshaft, and a
1055 or weakness of
even one of these
processes wi/l affect
the other five.
Piston Ported Induction
1. Intake
A.SIhe piston moves up towar the c yl lnder
head a low pressu
re (vacuum) is created In
the crankcase. As the movlng pistan uncovers
he i ltake por t, atmosphenc pr es su re pushes
a fresh charge
01 fuel-air nixture in ta the
crankcase.
The
mi xture accomp1 is hes two functions
befare il is moved
to he combu sti on chamber:
•
Oi 1 su spended in lhe mi xt ure coats all
Internal engine parts
in cludlng cylmder
walls crankshaft. and bearings.
• T
he atomlzed fue l mi xture absorbs hea! as
il enters !he crankcase. lowerlng lhe
engine's opera
ti ng temperalu re .
2. Compression
As t he piston continues lo move upward and
cover lhe cylind
er ports, the combust lo n
c
ha mb er is sealed and compression begins
The ajr-fu el mi xture introduced duri ng Ihe
previous rev olution's lfans/er cycle is now
t
ra pped and becomes compressed between
Ihe piston and cy
li nder head
3.lgnition
As the piston a proaches the lap t Ihe
cylind
er , lhe spark pl ug fi res and gnl es lhe
fu el -air mi xture. To compensale lar increases
in eng
in e rpm. spar k liming is advanced
electr
on ical1y.
Spark plug
Intake
port
open
Vacuum
F/9ure Z 1 Crankcase vac m;8 creat ed dunng Ihe
compression stroke When Ihe spark
plllg (¡res ¡he
compressed mixture al>nve l/ le Dlston ¡gil/les and
begms ro e ano
Shlndaiwa Inc 1995
6

Troubleshooting The 2-Stroke Cycle Engine Section 2
4. Power (combustion)
T he fuel-air mi xture xpands rapldly as il
burns, forclng
he plston dawn he cytlr de r.
Pistan movement is transferred to tlle eran -
shaft thraugh
the cannecting rad rotatmg ti e
crankshalt.
5. Exhaust
Exp an Ing gas es contlnue t fa ce Ihe pistan
downward, exposlng
the exhaus! port Mas! of
the spent combustlOn gasse are expelled
through the exhaust port
6. Transfer
The plston's downward movemel l c;overs tI'le
Intake port and un covers the transler por!
hile simultaneously compressing
the res h
fuel - ai r mi xture drawn into the crankcase
during S ep 1,
As th e ¡ransler porl is uncov-
ered, the f esh mi ture
sWlfls rapidly Irlto tlle
cylinder
As the Iresh fuel-alr m xture nters he
cylinder It al so helps to oush or scavengeany FIgW8 ? 2 Ttle burning mixture expands for ing 1/)",
remalning exhaust gasses out througn the
oistun down and comp r essmg ¡he Iresh r71l~tllf 1I the
cr3nkcas ' As Ihe plston exposes lile tlansfer por
exhaust porL
crankcase pressure {orces rresh mixture ¡neo the
combustlon chamber and Ilelps pus/] 'he remamine
8\haust gasses fhroug/l t he exhausf port ____ _
7

Section 2 Troubleshooting Th e 2- Str oke Cycle E ng ine
Theory of Reed Valve Induction
Operation
as used on Model 357
Fi gures 2.3 and 2.4
1.lntake
As the piston moves up toward he cylinde r·
head, low pressure (vacuum) cre al ed in Ihe
crankcase a
ll ows almospheric p re ssure lo
open Ih e reed valve and push a fresh charge
01luel-air mix
tu re in lo the cra nk case.
The fuel
-a ir mixture acc omplishes two
lunctions before
it is moved to lhe co l bustlor
chamber
• O
il suspended in the mixtu re coa ts a ll
internal engi ne parts includ in g cylinder
wall
s, cra nk sha ft , and bearings
• The alomized fuel mixture absorbs heat
from
th e crankcas e, lowering lhe eng in e's
operating temperatur
e.
2. Compression
As the pis ton con ti nues to move upwa rd and
co ver the cy li nder ports, the co mb ustion
chamber is sealed and compression
beg ins.
The air-tuel mixture intr
oduced dur in g lhe
previous rev
ol ution's transler cycle is now
trapped and becomes compressed be ween
Ihe piston and cy
li nder head.
3. lgnition
As the pislon approaches Ihe cyl in der head.
the spark plug
ti res and ignltes lhe fuel- al r
mi
xt ur e. To co mp en sa te fo r in c re ases rn
en gine rp m, spark timing is advanced
el ectronica li y
Combustion and Exhaust and Transfer
Compression Ports
(c losed)
o
Reed Valve Open
L
ow Pressure
Fi gu re 2.3 Reed Va /v e /ndUC/IOn Syslem (reed va/ve open)
~ ) Sh'nda,wa Inc. 19 958

Troubleshooting The 2-Stroke Cycle Engine Section2
4. Power (combustion)
The fuel-alr mi xture expands rapidly as 1\
burns. forcing the pisten down tlle cyilnder
Pistan movement
IS lransferred lo the crank-
shaft through
th e cennecllng rod, rotaling tl->e
crankshaft.
5. Exhaust
Expandlng gasses continue to lor e t he pistan
down
Nard, ex posing Ihe exllaust porL Mest 01
the spent combus Ion gasses are expelled
lhrough lhe exl1aust port.
6. Transfer
The plslon's downward mevemen! om -
presses
the luel -a ir mi xture drawn inlc, the
crankcase du
rl ng Slep 1, causlng lile reed
valve lo clase,
As the movlng pisten uncovers
t
he transfer por\. the resh mi !..Ire swirls
rapioly into
the cyllnder
As th e fresh fuel-air mi lure enters he
cylinder. 1I also helps o pusl, ar scavenge any
rem ai ning exha st gasses out through t he
ex hausl port
Exhaust Port
(ope n)
Reed Valve
Closed
Figure 2.4 Reeo Va/ve /nduCltOn Syslem (reel ' va/ve e/oseo)
9