Robin EH34V User manual

ROBIN AME

ROBIN

TO

WISCONSZN

ROBIN

ENGINE MODEL CROSS REFERENCE

LIST

ROBXN

EY 08

EY15

EY 15V

EY20

EY20V

EY23

EY28

EY3

5

EY40

EY45V

EY2

1

EY44

EY 18-3

EY25

EY 27

EHll

EH12

EH15

EH17

EH2

1

EH25

EH30

EH3OV

EH34

EH34V

EH43V

EC13V

DY23

DY27

DY30

DY3 5

DY4

1

WISCONSIN

ROBIN

SIDE

VALVE

w

1-080

W1-145

w1-145v

W1-185

Wl-185V

W

1-230

W

1-280

W1-340

W

1-390

w

1

-450v

EY2 1

W

EY44W

EY25W

EY27W

EY

18-3

W

-

WO1-115

wo1-120

WQ1-150

WO1-170

wo1-210

WO 1-250

WO1-300

WO

1

-300v

WO

1-340

WO1-340V

WO1-43OV

TWO

CYCLE

WT1-125V

DZESEL

WRD1-230

WRD

1-270

WRD1-300

WRD1-350

WRD1-410

Section

Title

ONTENTS

Page

1

.SPECIFICATIONS

......................................................................................

2JERFORMANCE

........................................................................................

2-

1

Maximum Output

...............................................................................

2-2

Maximum Torque At Maximum Output

..............................................

2-3

performance

curves

...........................................................................

3.

FEATURES

................................................................................................

4.GENERAL DESCRIPTION OF ENGINE COMPONENTS.....

....................

4-

1

Cylinder And Crankcase

.....................................................................

4-2

~~i~ ~~~~i~~

cover

...........................................................................

4-3

Crankshaft

.........................................................................................

4-4

Connecting Rod And Piston

.............................................................

4-5

Camshaft

...........................................................................................

4- 6

Valve Arrangement

.............................................................................

4-7

Cylinder Head

....................................................................................

4-8

Governor System

...............................................................................

4-9

Cooling System

..................................................................................

4- 10

Lubrication

.........................................................................................

4-

1

Ignition System

..................................................................................

4- 12

Carburetor

..........................................................................................

4- 13

Air Cleaner

.........................................................................................

4- 14

Balancers

............................................................................................

4- 15

Decompression System

......................................................................

1

2

4

5

6

7

8

9

4-

16

Sectional View Of Engine

..................................................................

10

12

13

28

42

43

5.DISASSEMBLY AND REASSEMBLY

......................................................

5-

1

Preparations And Suggestions

...........................................................

5-2

Special Tools

.....................................................................................

5-3

Disassembly Procedures

.....................................................................

5-4

Reassembly Procedures

......................................................................

6.MAGNETO

.................................................................................................

6-

1

Flywheel Magneto

..............................................................................

6-2

Basic Theory

......................................................................................

6-3

Wiring Diagram

..................................................................................

7.AUTOMATIC DECQMPRESSlON SYSTEM

.............................................

44

8.CARBURETQR

...........................................................................................

45

46

48

52

8-

1

Operation And Construction

..............................................................

8-2

Disassembly And Reassembly

....................

-

.......................................

g.STARTING SYSTEM

................................................................................

9-

1

Recoil Starter

.....................................................................................

9-

2

Electric Starting Motor (Option)

........................................................

ECIFICATIONS

Model

Type

Bore

X

Stroke

Piston Displacement

Maximum Horsepower

Maximum Torque

Rotation

Cooling

Lubrication

Lubricant

Carburetor

Fuel

Fuel Feed

Governor System

Ignition System

Spark Plug

Lighting Capacity

Starting System

Dry Weight

Dimensions Without

P.T.0 Shaft

LXWXH

I

EH30V

EH34V

EH43V

1

I

Air-Cooled, 4- Cycle, Vertical Shaft, Overhead Valve, Gasoline Engine

78x61 mm

(3.07

X

2.40

in.)

291 cc

(1

7.76

cuin.)

9/3600

HP/rpm

(6.7/3600

KW/rpm)

1.95/2500

kg

*

m/rpm

14.1/2500 ft.lbs/rpm)

84

X

61

mm

(3.31

X

2.40

in.)

338

cc

(20.63

cu.in.1

1 1

/3600

HP/rpm

(8.2/3600

KW/rpm)

2.41

/2500

kg m/rpm

17-4/2500

ft.lbs/rpm>

89x69

mm

(3.50

X

2.71

in.)

429

cc

(26.1

8

cu.in.1

13/3600

HP/rpm

(9.7/3600

KW/rpm)

2.85/2500

kg

m/rpn.

(20.6/2500

ft.Ibs/rpm

Counterclockwise

As

Viewd From PTO Shaft Side

Forced Air Cooling

Oil

Pump Type

Pressurised lubrication

with full flow oil filtel

Automobile Oil SAE

#

20,#

30

or

1

OW

-

30

Horizontal Draft Type

Automobile Gasoline

Gravity Type

Centrifugal Flyweight Type

Flywheel Magneto (Solid State)

NGK BP6ES (CHAMPION N9Y)

12V- 2.5A/3000rpm Battery Charge

Recoil Starter (Electric Starter Optional)

28

kg (61.7

I

bs.)

31

kg

(68.3

I

bs.)

386

X

383

X

327

mm

(1

5.20

X

15.07

X

12.88

in.)

410

X

401

X

349

mm

(1

6.1

4X

15.78X

13.74

in

Specificat[ons and dimensions are subject

to

change without notice.

-1-

2.

PERFORMANCE

2-1

MAXIMUM OUTPUT

The maximum output of an engine

is

such a standard power as produced by the engine with

its

throttle valve fully opened after

its

initial break-in period when all the moving

parts

are

properly worn in. Therefore, a new engine may not produce the maximum output in the beginning

because the moving parts are not in

a

properly worn-in condition.

2-2

MAXIMUM TORQUE

The

maximum torque indicates the torque

at

the output shaft when the engine is producing the

maximum output.

2

-

3

PERFORMANCE CURVES

EH30V

a

1

kg

-

m

REVOLUTION

r.

P.

m

-2-

0

EH34V

I

11

10

9

a:

g8

a

W

cn

a:

0

I

7

6

0

EH43V

13

a

I

It

l2

11

10

9

8

n

I

MAXIMUM

TORQUE

I

10

2000

2500

3000

3500

4000

L

REVOLUTION

-

I.

P.

m.

2.5

kg-

m

2.4

2.2

2.1

w

3

8

P

L

1500

2(

=

MAXIMUM

TORQUE

0

2500

3000

3500

REVOLUTION

-+

r.

P.

m.

-3-

3.

FEATURES

1.

The overhead valve design offers compactness, light weight and ideal combustion charastristics

,"-,

resulting in more power from less fuel and prolonged engine life.

2.

The vibration free design with the twin balancer system and lighter reciprocating parts.

3.

The

parts

such as a large capacity muffler, dual element air cleaner, helical type balancer gear

with extra long teeth and a blower housing and muffler cover made of resin laminated

"DAMPING

SHEET"

reduce noise to

a

minimum level.

4.

The automatic decompression system offers easy, dependable starting.

5.

The muffler and carburator are located on opposite sides, making the arrangements for cooling

air flow much easier in the design

of

power equipment.

4.

GENERAL DESCRIPTION

OF

ENGINE COMPONENTS

4-1

CYLINDER AND CRANKCASE

The cylinder and crankcase

is

single piece

aluminum diecasting. The cylinder liner, made

of

special cast iron, is molded into the aluminum

casting.

The crankcase has a mounting surface onthe

output shaft side, where the main bearing cover

is

attached. (See Fig.

1.)

Fig.

I

4-2

MAIN

BEARING

COVER

The main bearing cover

is

an aluminum

diecasting, which

is

mounted on the outprt shaft

side of the crankcase. Remove the main bearing

cover

to

inspect inside

of

the engine.

The main bearing cover also functions as an oil

pan, with

a

trochoid oil pump,

oil

filler and

oil

drain plug. (See Fig.

2.)

Fig.

2

-4-

4-

3

CRANKSHAFT

The crankshaft

is

forged carbon steel, and the

e

crank pin is induction-hardened. The output end

of the shaft has a crankshaft gear and balancer

gear which are pressed into position.

(See Fig.

3.)

BALANCER GEAR

\

CRANKSHAFT

GEAR

Fig.

3

4-4

CONNECTING

ROD

AND

PISTON

The connecting rod is forged aluminum alloy,

and its large and small ends function as

bearings. The piston

is

an

aluminum -alloy

casting, and carries two compression rings and

one oil ring.(See

Fig.

4.)

Fig.

4

4-

5

CAMSHAFT

The camshaft

is

a hollow shaped and made

of

special cast iron with the camshaft gear casted

together.

A .

cenerifugal decompression lever

is

assembled

on the camshft. The lubrication

oil

pump

is

driven

by

the pin installed on the end

of

the

camshaft. (See

Fig.

5.)

Fig.

5

-5-

4-

6

VALVE ARRANGEMENT

The intake valve

is

located at flywheel side of

the cylinder head.

Hard alloy valve seats are molded in the

cylinder head and stellite is fused to the exhaust

valve face.

The cylinder baffle leads cooling air

to

the

exhaust valve area for the optimum cooling.

(See Fig.

6.)

EXHAUST 'VALVE

INTAKE

VALVE

Fig.

6

4-7

CYLINDER HEAD

The cylinder head

is

an aluminum die casting,

which utilizes wedge type combustion chamber

for the highest combustion efficiency.

(See Fig.

7.)

4-

8

GOVERNOR SYSTEM

The governor

is

a centrifugal flyweight type

which ensures constant operation

at

the selected

speed against load variations.

The governor gear with governor weights

is

installed on the bearing cover and driven by

the camshaft gear. (See Fig.

8.)

Fig.

7

Fig.

8

-6-

4-9

COOLING

SYSTEM

The large fins on the flywheel provide sufficient cooling air capacity for the inlet and exhaust

area and cylinder.

a

The cylinder baffle helps the cooling air flow efficiently.

4-

10

LUBRICATION

Both EH30V (EH34V) and EH43V have a trochoid pump inside the main bearing cover that is

driven by the camshaft.

EH3OV and EH34V use forced splash

type

lubrication while the larger EH43V employs a pressurized

-lubrication which pressure lubricates all the rotating surfaces of the crankshaft and supplies

oil to piston, cylinder and connecting rod’s small end from the oil jet on crankshaft arm.

(See

Fig.

9.)

OIL FILTER

/

BEARING ,COVER

I

CAMSHAFT

Fig.

9

-7-

4-

1

IGNITION

SYSTEM

The ignition system is a transistor controlled

magneto ignition system which cosists of a

flywheel and an ignition coil with a built in

transistor mounted on the crankcase.

This system has

an

ignition timing advance

for

the easy starting. (See

Fig.

10.)

Fig.

10

4-

12

CARBURETOR

The engines are equipped with a horizontal

draft carburetor that has

a

float controlled fuel

system and a fixed main

jet.

The carburetors are calibrated carefully

for

the

sure starting,

good

acceleration,

low

fuel

consumption and sufficient output.

For

the datails, refer

to

page

45,

section

"8

CARBURETOR".

(See Fig.

11.1

Fig.

1 1

4-

13

AIR

CLEANER

The air- cleaner is a heavy- duty type with a

dual element system. (See

Fig.

12.1

I

A

CLEANER BASE

I

ELEMENT

I

CAP

hUT

I

Fig.

12

-8-

4-

14

BALANCERS

Unbalanced inertia force is balanced

by

the two

balancers which rotate at the same speed with

the crankshaft to effectively reduce vibration.

(See

Fig.

13.)

I

BLANCER

4-

15

DECOMPRESSION

SYSTEM

An

automatic decompression mechanism which

opens exhaust valve before the piston reaches

compression top is assembled on the camshaft

for easy starting. (See

Fig.

14)

Fig.

13

I

AUTOMATIC DECOMPRESSOR SYSTEM

*$

RETURN

SPRING

Fig.

14

-9-

4-

16

SECTIONAL

VIEW

OF

ENGINE

r

FLYWHEEL (COOLING FAN)

r

STARTING PULLEY

I-

RECOIL STARTER

-

lo

-

BALANCER SHAFT

2

BALANCER SHAFT

1

CONNECTING

ROD

TMUFFLER

CAP

M

CARBURETOR

AIR CLEANER

OIL

FILTER

CAMSHAFT

-

11

-

5.

DISASSEMBLY

AND

REASSEMBLY

5-

1

PREPARATIONS AND SUGGESTIONS

1)

When disassembling the engine, memorize well the locations of individual parts

so

that they

can be reassembed correctly.

If

yor are uncertain

of

identifying

some

parts,

it

is suggested

that tags

be

attached to them.

2)

Have boxes ready to keep disassembed parts by group.

3)

To

prevent missing and misplacing, temporarily assemble each group of disassembed parts.

4)

Carefully handle disassembed parts, and clean them with washing oil

if

necessary.

5)

Use the correct tools in the correct way.

5-2

SPECIAL TOOLS

Tool

No.

Use

Tool

209

-

95004

-

07

For

pulling off the flywheel

Flywheel puller with

bolt

228

-

95003

-

07

For placing piston ring

Piston ring compressor

PISTON

RING

COMPRESSOR

/

FLYWHEEL

PULLER

Fig.

15

-

12

-

5-

3

DISASSEMBLY PROCEDURES

Part

to remove

Oil

drain

Procedures

Tool

Remarks

Remove

oil

drain plug and drain oil. 17mm

Box

wrench

Be

careful not to

lose

the gasket.

Fuel tank

(1)

Turn

off fuel shut

-

off valve

and

(2)

Fuel shut-off valve and fuel line.

lOmm

Box

wrench

remove fuel

tank.

6

d

X

~OITUII

Bolt

*.**--**

2pcs.

6

4

X

35m

Bolt

*-.-..*.

1

pce.

I

6

+

BOLT

AND

WASHER

Fig.

I6

-

13

-

Step

Air cleaner

3

Part

to

remova Procedures

(1)

Remove air cleaner cover and element.

6

d

Plastic nut

6

d

Wing

nut

6

d

X

2Omm

Bolt

.--.

lpce.

6

d

x

lOmm

Bolt

*.-e

lpce.

base

and

crankcase.

cleaner) from stud

bolts.

6

Nut

--**

2pcs.

(2)

Remove

air

cleaner bracket

(3)

Remove breather hose from cleaner

(4)

Remove cleaner

base

and gasket

(Air

Remarks Tool

lOmm

Box

wrench

lOmm

Box

wrench

CLEANER

COVER

6

Q

FLANGE NUT:

2pcs.

6

Q

FLANGE

BOLT

Fig.

17

-

14

-

tep

4

control

Procedures

(1) Remove speed control assembly from

crank

case.

Then governor spring from

governor lever.

6

q5

X

16mm Bolt

-...

2pcs.

(2) Remove choke rod from speed

control

assembly, then remove choke rod from

choke shaft of the carburetor.

Remarks

Memorize

or

mark the

govenor spring hooking

position.

1

Governor (1) Remove governor lever from governor

lever shaft.

6

q5

x

25mm Bolt

*-a.

lpce.

(2)

Remove rod spring and governor rod

from governor lever, then remove rod

spring and governor rod from throttle

shaft

of

the carburetor.

Tool

10mm

Box

wrench

10mm

Box

wrench

Ppcs.

GOVERNOR

SHAFT

/

ROD

SPRING

Fig.

19

-

15

-

Step

Remarks

Procedures

Part to remove

6

Carburetor

(1)

Remove carburetor from stud bolts.

(2)

Remove gasket

(

Insulator

)

and

insulator from stud bolts.

Muffler

(1) Remove muffler and muffler cover

from stud

bolts.

8

4

x

16mm

Bolt

....

lpce.

bolts.

84

Nut........

.....

2pcs.

(2)

Remove gasket (Muffler) from stud

Be careful not to

lose

the gasket.

Tool

12mm Box wrench

Fig.

20

-

16

-

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