Shindaiwa 300 Manuale utente

Shindaiwa

Chain Saws

SERVICE

MANUAL

SHINDAIWA SERVICE MANUAL

$7.50

Service Manual

Shindaiwa Chain Saws

Contents Section page

1Model Designation and Identification ... 3

2Troubleshooting ...................................... 6

3Carburetors ............................................ 22

Operation ................................................. 22

Adjustment .............................................. 24

Servicing .................................................. 27

4Recoil Starters ....................................... 40

5Ignition Systems .................................... 46

Troubleshooting ....................................... 49

6Clutches ................................................. 60

7Cylinders and Pistons ........................... 70

8Engine Crankcase ................................. 80

9Mufflers ................................................... 92

10 Chain Brakes .......................................... 98

11 Oil Pumps ............................................. 108

12 Rear Handles and A/V Cushions........ 114

13 Model 357 Top Handle Saw ................ 118

14 Appendix .............................................. 128

Specifications ........................................ 128

Torque Values ........................................ 130

Metric Conversions ............................... 131

Tolerances and Wear Limits .................. 132

Fuel and Oil ........................................... 134

Special Service Tools ............................ 136

䊚Shindaiwa Inc. 1995

Attention Statements

Throughout this manual are statements

surrounded by boxes and preceded by

special symbols:

WARNING!

A statement preceded by the word

“WARNING” contains information that

should be acted upon to prevent serious

bodily injury.

ATTENTION!

A statement preceded by the word

“ATTENTION” contains information that

should be acted upon to avoid damaging

the saw.

MODEL ID

Additional statements that are not preceded

by symbols are:

IMPORTANT!

A statement preceded by “IMPORTANT” is

one that possesses special significance.

䊚Shindaiwa Inc. 1995 3

Model Designation and Identification Section 1

Chain Saws

Model 300

Model 300S

Model 360

Model 377

MODEL ID

Typical location

SHINDAIWA ENGINE

MODEL

SER.

NO.

X X X X X

X X X X X X X

ACC-20

Specifications subject to change without notice.

䊚Shindaiwa Inc. 1995

Chain Saws

Section 1 Model Designation and Identification

Model 488

Model 575 (680 and 695 similar)

57701

Model 577

Model 577P

MODEL ID

Specifications subject to change without notice.

䊚Shindaiwa Inc. 1995 5

Model Designation and Identification Section 1

Chain Saws

Model 757

Model 357

MODEL ID

Specifications subject to change without notice.

Model 757C

䊚Shindaiwa Inc. 1995

CRK-27

Section 2 Troubleshooting The 2-Stroke Cycle Engine

Theory of

Operation

Figures 2.1 and 2.2

Spark plug

Compression/

Combustion

Exhaust and

transfer ports

closed

Intake

port

open

Crankcase

Vacuum

Figure 2.1 Crankcase vacuum is created during the

compression stroke. When the spark plug fires, the

compressed mixture above the piston ignites and

begins to expand.

Piston Ported Induction

1. Intake

As the piston moves up toward the cylinder

head, a low pressure (vacuum) is created in

the crankcase. As the moving piston uncovers

the intake port, atmospheric pressure pushes

a fresh charge of fuel-air mixture into the

crankcase.

The mixture accomplishes two functions

before it is moved to the combustion chamber:

■Oil suspended in the mixture coats all

internal engine parts including cylinder

walls, crankshaft, and bearings.

■The atomized fuel mixture absorbs heat as

it enters the crankcase, lowering the

engine’s operating temperature.

2. Compression

As the piston continues to move upward and

cover the cylinder ports, the combustion

chamber is sealed and compression begins.

The air-fuel mixture introduced during the

revolution’s transfer cycle is now

trapped and becomes compressed between

the piston and cylinder head.

3. Ignition

As the piston approaches the top of the

cylinder, the spark plug fires and ignites the

fuel-air mixture. To compensate for increases

in engine rpm, spark timing is advanced

electronically.

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

loss or weakness of

even one of these

processes will affect

the other five.

TROUBLESHOOTING

䊚Shindaiwa Inc. 1995 7

Troubleshooting The 2-Stroke Cycle Engine Section 2

Figure 2.2 The burning mixture expands, forcing the

piston down and compressing the fresh mixture in the

crankcase. As the piston exposes the transfer port,

crankcase pressure forces fresh mixture into the

combustion chamber and helps push the remaining

exhaust gasses through the exhaust port.

4. Power (combustion)

The fuel-air mixture expands rapidly as it

burns, forcing the piston down the cylinder.

Piston movement is transferred to the crank-

shaft through the connecting rod, rotating the

crankshaft.

5. Exhaust

Expanding gasses continue to force the piston

downward, exposing the exhaust port. Most of

the spent combustion gasses are expelled

through the exhaust port.

6. Transfer

The piston’s downward movement covers the

intake port and uncovers the transfer port,

while simultaneously compressing the fresh

fuel-air mixture drawn into the crankcase

during Step 1. As the transfer port is uncov-

ered, the fresh mixture swirls rapidly into the

cylinder.

As the fresh fuel-air mixture enters the

cylinder, it also helps to push or

scavenge

any

remaining exhaust gasses out through the

exhaust port.

CRK-26

Exhaust and

transfer ports

open

Intake port

closed

TROUBLESHOOTING

䊚Shindaiwa Inc. 1995

Section 2 Troubleshooting The 2-Stroke Cycle Engine

Reed Valve Induction

as used on Model 357

Figures 2.3 and 2.4

1. Intake

As the piston moves up toward the cylinder

head, low pressure (vacuum) created in the

crankcase allows atmospheric pressure to

open the reed valve and push a fresh charge

of fuel-air mixture into the crankcase.

The fuel-air mixture accomplishes two

functions before it is moved to the combustion

chamber:

■Oil suspended in the mixture coats all

internal engine parts including cylinder

walls, crankshaft, and bearings.

■The atomized fuel mixture absorbs heat

from the crankcase, lowering the engine’s

operating temperature.

2. Compression

As the piston continues to move upward and

cover the cylinder ports, the combustion

chamber is sealed and compression begins.

The air-fuel mixture introduced during the

revolution’s transfer cycle is now

trapped and becomes compressed between

the piston and cylinder head.

3. Ignition

As the piston approaches the cylinder head,

the spark plug fires and ignites the fuel-air

mixture. To compensate for increases in

engine rpm, spark timing is advanced

electronically.

Theory of

Operation

TROUBLESHOOTING

Figure 2.3 Reed Valve Induction System (reed valve open)

CRB-75

Spark Plug

Low Pressure

Reed Valve Open

Combustion and

Compression Exhaust and Transfer

Ports (closed)

䊚Shindaiwa Inc. 1995 9

Troubleshooting The 2-Stroke Cycle Engine Section 2

4. Power (combustion)

The fuel-air mixture expands rapidly as it

burns, forcing the piston down the cylinder.

Piston movement is transferred to the crank-

shaft through the connecting rod, rotating the

crankshaft.

5. Exhaust

Expanding gasses continue to force the piston

downward, exposing the exhaust port. Most of

the spent combustion gasses are expelled

through the exhaust port.

6. Transfer

The piston’s downward movement com-

presses the fuel-air mixture drawn into the

crankcase during Step 1, causing the reed

valve to close. As the moving piston uncovers

the transfer port, the fresh mixture swirls

rapidly into the cylinder.

As the fresh fuel-air mixture enters the

cylinder, it also helps to push or

scavenge

any

remaining exhaust gasses out through the

exhaust port.

TROUBLESHOOTING

Figure 2.4 Reed Valve Induction System (reed valve closed)

CRB-74

Spark Plug

Transfer Port

(open)

Exhaust Port

(open)

Reed Valve

Closed

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