Robin America EH30 User manual

ROBIN AMERICA, INC.
ROBIN TO W1SCONSJ.N ROBIN
ENGINE MODEL CROSS REFERENCE LIST
ROBIN
EY08
EY15
EY 15V
EY20
EY20V
EY23
EY28
EY35
EY40
EY45V
EY2 I
EY44
EY18-3
EY25
EY27
EHl1
EH12
EHl5
EH17
EH2 1
EH25
EH30
EH30V
EH34
EH34V
EH43V
EC13V
DY23
DY27
DY30
DY35
DY4 1
WISCONSIN
ROBIN
-
W1-080
W1-145
W1-145V
Wl-185
W1-185V
W1-230
w 1-280
W1-340
W 1-390
W 1 -450V
EY21W
EY44W
EY25W
EY27W
EY18-3W
v
WO1-115
wo1-120
WO1-150
WOI-170
wo1-210
WO 1-250
WO1-300
WOI-3oov
WO1-340
WO 1 -3 40V
WO 1 -430V
TWO CYCLE
WT1-125V
DIESEL
WRD 1-230
WRD 1-270
WRD1-300
WRDI-350
WRD1-410

CONTENTS
Section Title Page
1 .SPECIFICATIONS. .....................................................................................
2.PERFORMANCE ........................................................................................
2-1 Maximum Output ...............................................................................
2-2 Continuous RatedOutput ..................................................................
1
3
3
3
2-3 ~~~i~~~ T~~~~~ ...............................................................................
3
2-4 performance curves ...........................................................................
4
3.FEATURES ................................................................................................
6
4.GENERAL DESCRIPTION OF ENGINECOMPONENTS ......................... 6
6
6
7
7
8
8
4-7 ValveArrangement .............................................................................
8
8
9
4- 10 Cooling Systern ..................................................................................
9
9
10
10
10
11
11
12
14
14
14
15
32
42
6.MAGNETO .................................................................................................
42
42
43
44
7. AUTOMATIC DECOMPRESSlON SYSTEM ............................................
45
8.CARBURETOR. ..........................................................................................
46
46
47
4- 1 Cylinder And Crankcase .....................................................................
4-2 MainBearingCover ...........................................................................
4-3 Crankshaft .........................................................................................
4-4 Connecting Rod And piston ..............................................................
4-5 PistonRings ......................................................................................
4-6 Camshaft ...........................................................................................
4-8 CylinderHead ....................................................................................
4-9 GovernorSystem ...............................................................................
4- 1 1 Lubrication .........................................................................................
4- 12 Ignition System .................................................................................
4- 13 Carburetor .........................................................................................
4- 14 Air Cleaner ........................................................................................
4- 15 Balancers ...........................................................................................
4- 16 DecompressionSystem .....................................................................
4- 17 SectionalView Of Engine ..................................................................
5.DISASSEMBLY AND REASSEMBLY ......................................................
5- 1 Preparations And Suggestions ...........................................................
5-2 Special Tools .....................................................................................
5-3 DisassemblyProcedures .....................................................................
5-4 ReassemblyProcedures ......................................................................
5-5 Break-inOperation ............................................................................
6- 1 FlywheelMagneto ..............................................................................
6-2 BasicTheory ......................................................................................
6-3 WiringDiagram ..................................................................................
8- 1 OperationAndConstruction ..............................................................
8-2 DisassemblyAndReassembly ............................................................

1. SPECIFICATIONS
EH30
Model
EH30B
EH30D
EH30BS
I
EH30DS
Type Air-Cooled.4-Cycle.Single-Cylinder,Horizontal
P.T.O. Shaft, Gasoline Engine
Bore
X Stroke
8.3
CompressionRatio
291 cc (1 7.76 cu.in.1
PistonDisplacement
78 X 61 mm (3.07 X 2.40 in.)
-~
output
Cont inuous
9.0/3600 HP/rpm
9.0/1800 HP/rpm
Max.
7.0/3600 HP/rpm 7.0/1800 HP/rpm
Max.Torque
I 3-9/1250kg m/rpm
1.95/2500 kg m/rpm
Direction
of Rotation
ForcedAirCooling
Coolingsystem
Counterclockwise
As ViewdFrom P.T.O. Shaft Side
~ ~ ~~
ValveArrangement
Splash Type Lubrication
OverheadValve
~~~~ ~ ~ ~
Lubricant
1.2 liters (0.32 U.S. gal.)
Capacity
of Lubricant
Automobile OilSAE
# 20, # 30 or 1 OW-30
Carburetor
AutomobileGasoline
Fuel
HorizontalDraft,Float
Type
~ ~~ ~~ ~~
Fuel ConsumptionRatio] 230 gr/HP-hAtContinuousRatedOutput
~~ ~~
Fuel Feed System GravityType
Fuel TankCapacity
FlywheelMagneto(SolidState)IgnitionSystem
6 liters(1.58 U.S. gal.)
SparkPlug
NGK BP6ES (CHAMPION N9Y)
ChargingCapacity I 12V-1.3A I - I 12V- 1.3A
Starting
System
Recoiland
Recoil
Starter
ElectricStarter ElectricStarter
Recoil Starter
Recoil and
Speed Reduction
I 1/2 Cam ShaftDrive I -
GovernorSystem
DoubleElementType
Air Cleaner
CentrifugalFlyweightType
DryWeight
333mm
(1 3.1 1 in
363mm
(1 4.29in.)
333mm (1 3.1 1 in.)
363mm
( 14.29in.)
Length
33.0kg ( 72.81 b.)
30.0kg ( 66.1 I b.) 34.0kg ( 75.01 b.)
3 1 .Okg ( 68.31 b.)
I
1 Dimensions 395mm
(1 5.55 in.)
Width
,
482mm (1 8.98 in.)
Height
Specifications are subject
to changewithoutnofice.
-1-

Model
EH34
EH348 EH340S
EH34BS
1 EH34D
Type Air-Cooled,
4- Cycle, Single-Cylinder,Horizontal P.T.O. Shaft, GasolineEngine
~~~~~
Bore X Stroke
8.3
CompressionRatio
338cc
(20.63 cu.in.)
PistonDisplacement
84 X 61 mm (3.31 X 2.40 in.)
output Cont inwus
1 1.0/3600 HP/rpm
1 1.0/1800 HP/rpm
Max.
8.0/3600 HP/rpm
8.0/1800 HP/rpm
Max.Torque
ForcedAir
Cooling
Coolingsystem
CounterclockwiseAsViewdFrom
P.T.O. ShaftSide
Direction
of Rotation
2.41/2500 kg m/rpm
4.82/1250kg m/rpm
ValveArrangement
SplashType
tubrication
OverheadValve
Lubricant AutomobileOil SAE
# 20, # 30 or 1 OW-30
Capacity of Lubricant I
~ ~~
1.2 liters (0.32 U.S. gal.)
~~ ~~ .
Carburetor
AutomobileGasoline
Fuel
HorizontalDraft,FloatType
Fuel ConsumptionRatio
I 230 gr/HP-hAtContinuous RatedOutput I
Fuel Feed System GravityType
FuelTankCapacity
FlywheelMagneto(SolidState)
Ignition System
6 liters (1.58 U.S. gal.)
SparkPlug
12V - 1.3A
-
12V - 1.3A
-
ChargingCapacity
NGK BP6ES(CHAMPION N9Y)
StartingSystem Recoil
and Recoiland
Recoil
Starter ElectricStarter Recoil
Starter ElectricStarter ,
Speed Reduction I 1/2 Cam ShaftDrive I - I
GovernorSystem
DoubleElement
Type
AirCleaner
CentrifugalFlyweightType
DryWeight
Height
3 1 .Okg (68.31 b.)
33.0kg ( 72.81 b.) 30.0kg ( 66.1 I b.) 34.0kg ( 75.01 b.)
363mm (1 4.29in.)
333mm (1 3.1 1 in.)
482mm
(1 8.98 in.)
395rnm
(1 5.55 in.)
333mrn (1 3.1 1 in
363mm (1 4.29in.)
Specificationsaresubject to change without nofice.
-2-

2. PERFORMANCE
2-1 MAXIMUM OUTPUT
The maximum outputistheoutput of anenginewithitsthrottlevalvefully opened under the
condition that allthe moving partsareproperly worn in aftertheinitialbreak- in period.
A new engine may not producefullmaximum output while itsmovingpartsarestillnot broken
-in.
2-2 CONTINUOUS RATED OUTPUT
Thecontinuousratedoutput is theoutput of an engine at optimumgovernedspeedwhich is
most favorablefromtheviewpoint of engine’s life andfuelconsumption,
When theengine
is installed on acertainequipment, it is recommended thatthe continuous output
required
from theengine be kept below thiscontinuousratedoutput.
2-3 MAXIMUM TORQUE
The maximum torque is thetorque attheoutputshaft when theengine is producingmaximum
outputatcertainrevolution.
-3-

2 - 4 PERFORMANCE CURVES
OEHBOD, B
9
8
7
6
5
4
3
2
1
0
2000
2400 2800 3200
(1 000) (1 200) (1 400)
(1 600)
3600
(1 800)
REVLOUTION- r. p. m.
Kg - m
CONTINUOUS
RATED OUTPUT
RECOMMENDABLE
\ HORSEPOWER RANGE
-4-

*EH34D, B
HP
A
52
B
w
cn
0
I
2000 2400 2800 3200 3600
(1 000) (1 200) (1 400) (1 600) (1 800)
REVLOUTION- r. p. m.
Kg - m
w
3
0
CONTINUOUS
RATED OUTPUT
RECOMMENDABLE
HORSEPOWER RANGE
-5-

3. FEATURES
1. The overheadvalvedesignoffersacompactness, light weight and ideal combustion charastristics
2. Thevibrationfreedesignwiththetwinbalancersystemandlighterreciprocatingparts.
3. Such parts asthelargecapacitymuffler,dual element air cleaner,helical type balancergear
withextralongteethandthe blower housingand mufflercovermade
of resinlaminated
"DAMPING SHEET" reduce noise to aminimum.
resulting in more power from lessfuel
and prolongedengine life.
4. Theautomatic decompression systemofferseasy,dependablestarting.
5. Themuffler and carburetorare located onoppositesides,makingthearrangementsfor cooling
air flow
much easier in thedesign of powerequipment.
4. GENERALDESCRIPTION OF ENGINE COMPONENTS
4-1 CYLINDER AND CRANKCASE
Thecylinderandcrankcase is singlepiece
aluminumdiecasting.Thecylinderliner,made
of special cast iron, is molded into the aluminum
casting.
Thecrankcasehas a mountingsurfaceonthe
outputshaft side,where the main bearingcover
is attached. (See Fig. 1.)
Fig. 1
4-2 MAIN BEARINGCOVER
The main bearing cover is analuminum
diecasting, which is mounted on theoutput shaft
side of thecrankcase.
Remove the main bearing cover to inspectinside
of theengine.
Pilotsand bosses are machined on the cover
for
direct mounting of theengine onto such
machines asgeneratorsandpumps.
Oil gauge(fillers)are on both sides of thecover
for easymaintenance.
fig. 2
-6-

4- 3 CRANKSHAFT
Thecrankshaft is forgedcarbonsteel,andthe
crank pin
is induction-hardened.Theoutput end
of theshafthasacrankshaftgearand balancer
gearthatarepressedinto position.
(See Fig. 3.)
4-4 CONNECTING ROD AND PISTON
The connectingrod is forgedaluminum alloy,
and
its largeandsmallendsfunctionas
bearings.
The piston is an aluminum alloy
casting,andcarriestwo compression ringsand
one oil ring.(See Fig. 4.)
4-5 PISTON RINGS
The Pistonringsaremade of special cast iron.
The profile of the top ring is barrel face and
tile SWOJI~ ring has a tapered face with an
mder - CUT:.
'l'he oil ring consists of a cutter ring and a
coil expander far better sealing and less oil
(xmsumption.
B TYPE
/
D TYPE
Fig. 3
Fig. 4
.TOP RING
SECOND
RING
OILRING
Fig. 5
-7-

4- 6 CAMSHAFT
Thecamshaft for the D- typeengineismade
of specialcastironandcamshaftgearsare
castedtogetherin one piece.
Both sides of theshaftfitintotheplane
bearings
on thecrankcaseandmainbearing
cover.
Thecamshaftfor
B- typeengineismade of
forged carbon steel and alsofunctionsas PTO
shaft.
Cam gear
is pressfittedontheshaftand ball
bearingsareemployedonthebothsidesfor
supportingtheshaft. (See Fig.
6.1
4- 7 VALVE ARRANGEMENT
Theintakevalve is located on flywheelside of
thecylinderhead.
Hardalloyvalveseats are moIded inthe
cylinderhead
and stellite is fusedto theexhaust
valve face.
Thecylinderbaffleleads cooling air
to the
exhaustvalveareafortheoptimum cooling.
(See Fig.
7.)
I B TYPE
Fig. 6
VALVE
I
Fig. 7
4-8 CYLINDER HEAD
Thecylinderhead is an aluminum die casting
which utilizeswedgetypecombustionchamber
for thehighestcombustion efficiency.
(See
-Fig. 8.)
Fig. 8
-8-

4- 9 GOVERNOR SYSTEM
Thegovernor is acentrifugalflyweight type
which ensuresconstantoperation at the selected
speedagainstloadvariations.
Thegovernorgearwithgovernorweights
is
installedinthecrankcase and drivenbythe
balancershaft. (See Fig.
9.1
Fig. 9
4- 10 COOLING SYSTEM
Thelargefins on theflywheelprovidesufficientcoolingaircapacity for the inlet andexhaust
areaandcylinder.
Thecylinderbafflehelpsthecoolingairflowefficiently.
4- 11 LUBRICATION
A11 therotatingandslidingparts are splash-
lubricated
by the oil scraper on the connecting
rod. (See
Fig. 10.)
I
OIL SCRAPER
Fig. 10
-9-

4- 12 IGNITION SYSTEM
Theignitionsystem is atransistorcontrolled
magnetoignitionsystem which cosists of a
flywheeland an ignition coil withabuiltin
transistormountedonthecrankcase.
Thissystem has
an ignitiontimingadvancefor
easystarting. (See Fig.
11.)
4- 13 CARBURETOR
Theenginesareequippedwithahorizontal
draftcarburetorthathasafloat controlledfuel
systemandafixedmain
jet.
Thecarburetorsarecalibratedcarefully for the
surestarting, good acceleration,
low fuel
consumptionandsufficientoutput.
For thedatails,refertopage 46, section
"8 CARBURETOR". (See Fig. 12.)
I
Fig. 11
Fig. 12
4- 14 AIR CLEANER
Theair- cleaner is aheavy - dutytypewitha
dualelementsystem. (See Fig.
13.)
I
Fig. 13
- 10 -

4- 15 BALANCERS
Unbalanced inertiaforceis balanced by thetwo
balancers which rotate atthe samespeedwith
thecrankshaft
to effectivelyreducevibration.
(See Fig.
14.)
4- 16 DECOMPRESSION SYSTEM
An automaticdecompressionmechanismwhich
opensexhaustvalvebeforethepistonreaches
compression
top is assembled on thecamshaft
for easystarting. (See Fig. 15)
BALANCER 1
Fig. 14
AUTOMATIC DECOMPRESSOR SYSTEM
Fig. I5
- 11 -

4- 17 SECTIONAL VIEW OF ENGINE
FUEL 1
/FUEL TANK
FLYWHEEL (COOLINGFAN) ' MAIN BEARING COVER
- 12 -

PLUG COVER ROCKER ARMS
DRAIN PLUG \BALANCER SHAFT 2
- 13 -

5. DISASSEMBLY AND REASSEMBLY
5- 1 PREPARATIONS AND SUGGESTIONS
1) When disassemblingtheengine, memorize the locations of individualparts so thattheycan
be reassembedcorrectly. If yor areuncertain of identifying some parts,itissuggestedthat
tags be attached to them.
2) Have boxesreadytokeepdisassembed parts by group.
3) To preventlosingandmisplacing,temporarilyassembleeach group of disassembed parts.
4) Carefullyhandledisassembedparts,andcleanthem with washing oil if necessary.
5) Use thecorrect tools inthecorrect way.
5-2 SPECIAL TOOLS
Tool No.
Use
Tool
209 - 95004 - 07
For placing piston ring
Piston
ring compressor
228-95003-07
For pulling off theflywheel
Flywheel puller with bolt
PISTON RING COMPRESSOR
/
FLYWHEEL PULLER
Fig. 76
- 14 -

5- 3 DISASSEMBLY PROCEDURES
Step
Tool Remarks Procedures Part to remove
1 14mm box wrench Be careful not to lose (1) Remove oil drain plug and drain oil.
Oil drain
(2) To discharge oil quickly, remove oil
the gasket.
gauge.
Fig. 17
- 15 -

Step Part to remove
I
2 Air cleaner
Procedures Remarks Tool
(1) Remove air cleaner cover. Be careful not to lose
(2) Loosen twowing bolts and remove washer and gasket for
(3)Loosen screwon swivel and pull out
(4) Remove two flange nuts and a bolt Pull off breather pipe lonun box wrench
element.
wing bolt.
choke
knob.
and remove cleaner base. from cleaner base.
M6 flange nut .-.- 2pcs.
M6 X 12mm bolt and washer * lpce.
M6 FLANGENUT : 2pcs.
M6 BOLTANDWASHER
CLEANER COVER
CLEANER BASE
WING BOLT
Fig. 18
- 16 -