Robin EH30V, EH43V, EH34V Service 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 1 Ignition System
..................................................................................
4- 12
Carburetor
..........................................................................................
4- 13
Air Cleaner
.........................................................................................
4- 14
Balancers
............................................................................................
4- 15
Decompression System
......................................................................
1
2
2
2
2
4
4
4
4
5
5
5
6
6
6
7
7
8
8
8
9
9
4-
16
Sectional View Of Engine
..................................................................
10
12
12
12
13
28
42
42
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
45
46
48
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
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
with extra long teeth and a blower housing and muffler cover made of resin laminated
"DAMPING
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
4.
GENERAL DESCRIPTION
such as a large capacity muffler, dual element air cleaner, helical type balancer gear
SHEET"
reduce noise to a minimum level.
of
power equipment.
OF
ENGINE COMPONENTS
,"-,
4-1
The cylinder and crankcase
aluminum diecasting. The cylinder liner, made
of
casting.
The crankcase has a mounting surface onthe
output shaft side, where the main bearing cover
is
4-2
The main bearing cover
diecasting, which
side of the crankcase. Remove the main bearing
cover
The main bearing cover also functions as an oil
pan, with
drain plug. (See Fig.
CYLINDER AND CRANKCASE
is
single piece
special cast iron, is molded into the aluminum
attached. (See Fig.
MAIN
to
BEARING
is
inspect inside
a
trochoid oil pump,
1.)
COVER
is
an aluminum
mounted on the outprt shaft
of
the engine.
oil
filler and
oil
2.)
Fig.
I
-4-
Fig.
2
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.
to
The cylinder baffle leads cooling air
the
exhaust valve area for the optimum cooling.
(See Fig.
4-7
The cylinder head
6.)
CYLINDER HEAD
is
an aluminum die casting,
which utilizes wedge type combustion chamber
for the highest combustion efficiency.
(See Fig.
7.)
EXHAUST 'VALVE
Fig.
6
INTAKE
VALVE
4-
8
GOVERNOR SYSTEM
The governor
which ensures constant operation
is
a centrifugal flyweight type
at
the selected
speed against load variations.
The governor gear with governor weights
installed on the bearing cover and driven by
the camshaft gear. (See Fig.
8.)
is
-6-
Fig.
Fig.
7
8
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
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
5-
1
PREPARATIONS AND SUGGESTIONS
1)
When disassembling the engine, memorize well the locations of individual parts
can be reassembed correctly.
be
that tags
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
5)
Use the correct tools in the correct way.
attached to them.
AND
If
REASSEMBLY
yor are uncertain
of
identifying
some
parts,
if
so
it
is suggested
necessary.
that they
5-2
SPECIAL TOOLS
Tool
No.
209
-
95004
-
07
228 - 95003
-
07
PISTON
Tool
Flywheel puller with
Piston ring compressor
RING
COMPRESSOR
bolt
/
Use
For
pulling off the flywheel
For placing piston ring
Fig.
15
-
FLYWHEEL
12
-
PULLER
5-
3
DISASSEMBLY PROCEDURES
Part
to remove
Oil
drain
Fuel tank
Procedures
Remove
(1)
(2)
oil
drain plug and drain oil. 17mm
Turn
remove fuel
Fuel shut-off valve and fuel line.
6
6
off fuel shut - off valve
tank.
d
X
~OITUII
4
X
35m
Bolt
*.**--**
Bolt
*-.-..*.
2pcs.
1
pce.
and
Remarks
Be
careful not to
the gasket.
lose
lOmm
Tool
Box
Box
wrench
wrench
BOLT
I
AND
WASHER
6
+
Fig.
I6
-
13
-
Step
3
Part
to
remova Procedures
Air cleaner
(1)
Remove air cleaner cover and element.
6
d
Plastic nut
6
d
Wing
nut
(2)
Remove
6
d
6
d
(3)
Remove breather hose from cleaner
base
(4)
Remove cleaner
cleaner) from stud
6
air
X
2Omm
x
lOmm
and
Nut
--**
cleaner bracket
Bolt
.--.
Bolt
*.-e
crankcase.
base
bolts.
2pcs.
lpce.
lpce.
and gasket
(Air
Remarks Tool
lOmm
lOmm
Box
Box
wrench
wrench
6
Q
FLANGE NUT:
2pcs.
6
Q
CLEANER
FLANGE
COVER
BOLT
Fig.
17
-
14
-
tep
Procedures
Remarks
Tool
4
control
Governor (1) Remove governor lever from governor
lever shaft.
(1) Remove speed control assembly from
case.
crank
governor lever.
q5
X
6
(2) Remove choke rod from speed
assembly, then remove choke rod from
choke shaft of the carburetor.
6
q5
x
(2)
Remove rod spring and governor rod
from governor lever, then remove rod
spring and governor rod from throttle
shaft
Then governor spring from
16mm Bolt
25mm Bolt
of
the carburetor.
-...
*-a.
2pcs.
lpce.
1
control
Memorize
govenor spring hooking
position.
or
mark the
10mm
10mm
Box
Box
wrench
wrench
GOVERNOR
SHAFT
/
ROD
-
SPRING
Fig.
15
Ppcs.
19
-
Part to remove
Step
Procedures
Remarks
Tool
6
Carburetor
Muffler
(1)
Remove carburetor from stud bolts.
(2)
Remove gasket
insulator from stud bolts.
(1) Remove muffler and muffler cover
from stud
84
8
4
x
(2)
Remove gasket (Muffler) from stud
bolts.
Nut........
16mm
bolts.
Bolt
(
Insulator ) and
.....
2pcs.
....
lpce.
Be careful not to
the gasket.
lose
12mm Box wrench
Fig.
20
-
16
-
Step
'art to remove
-
8
9
-
Electric
starter
(Option)
Diode
rectifler
Procedures
(1)
Remove Black Wire From
Starter.
6
q5
Nut
***.*
1
pce.
(2)
Remove electric starter from crank-
case.
8
9
x
30mm Bolt
(1)
Disconnect wires.
GreedWhite
White
(2) Remove diode rectifier and bracket
from crank case.(See Fig. 22.)
6
q5
x
.
. . .
15mm Bolt
*
-
-
. . . . . .
-.--
2pcs.
2
*
1
....
2pcs.
Electric
Remarks
~~
Reattach The terminal
nut to the motor to
keep it from missing.
lOmm
12mm
lOmm
Tool
Box
Box
Box
wrench
wrench
wrench
Fig.
21
-
17
-
Step
l~art
to
remove1
Procedures
Remarks
Tool
lo
11
I
Blower
housing
/
6
+
FLANGE BOLT
Remove
6
x
8mm
6
d
X
8rn
recoil
from blower housing.
Bolt
*.e-
4pcs.
Bolt
.--.
4pcs.
:
4pcs.
from
crankcace.
lorn
Box wrench
I
l0mm
/
Box wrench Remove blower housing
BLOWER
/
HOUSING
Fig.
23
.ANGE
BOLT
:
4pcs.
-
18
-
Step
Part
to
remove
Ignition coil
(1)
Remove spark plug
plug
and
(2)
Disconnect kill switch
comes out from ignition coil from kill
switch on speed control
(3)
Remove ignition coil from
6
0
x
Procedures
grommet from blower housing.
30mm
Bolt
I
cap
**-*
2pcs.
GROMMET
from spark
wire
which
assy.
crankcase.
Remarks Tool
6
+
BOLT AND WASHER
IGNITION COIL
:
2pcs.
I
KILL
SWITCH
&$
I
WIRE
Fig.
24
-
19
-
Step
lPart
to
13
I
Flywheel
rem0
(1) Remove
8
X
(2)
Remove nut
(See Fig.
16 4 Nut
(3)
Remove flywheel using flywheel puller.
(See
(4)
Remove charge coil.(See Fig.
6
d
X
Procedures
rotating
12mm Bolt
26.)
---a
Fig. 27.)
30mm Bolt
from
lpce.
screen
.-.-
3pcs.
crankshaft.
*-*=
2pcs.
1
from flywheel.
28.)
Remarks
Flywheel can easily be
removed by striking
of
the head
bolt
of
a
with
the center
flywheel puller
hammer.
12mm
24mm
lOmm
Tool
Box
Box
Box
wrench
wrench
wrench
$-
"
8
+
BOLT
STARTER
'FLYWHEEL
:
BPCS.
PULLEY
1
Fig.
26
Fig.
25
-
I
I
20.
-
fig.
Fig.
27
CHARGE
28
COIL
Step
to
remove
Remarks Procedures Part
Tool
14
Cylinder
baffle etc.
(1)
Remove Cylinder Baffle.
6
4
x
8mm Bolt
(2) Remove exhaust manifold and gasket.
8
4
Nut
****
(3)
Remove spark plug.
..-.
2pcs.
4pcs.
lOmm Box wrench
BOX
12mm
19mm Plug wrench
wrench
GASKET
EXHAUST MANIFOLD
T
%
Fig.
29
-
21
-
8
+
FLANGE
NUT
:
PPCS.
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