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Robin America EH30 Service Manual

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  • Page 2 ROBIN AMERICA, INC. ROBIN TO W1SCONSJ.N ROBIN ENGINE MODEL CROSS REFERENCE LIST ROBIN WISCONSIN ROBIN W1-080 EY08 W1-145 EY15 W1-145V EY 15V Wl-185 EY20 W1-185V EY20V W 1-230 EY23 1-280 EY28 W1-340 EY35 1-390 EY40 1 -450V EY45V EY21W EY2 I EY44W EY44 EY18-3W...

  • Page 3: Table Of Contents

    CONTENTS Section Title ..................1 .SPECIFICATIONS..................2.PERFORMANCE ................Maximum Output ..............Continuous Rated Output ................~~~i~~~ T~~~~~ curves ................2 - 4 performance ....................3.FEATURES 4.GENERAL DESCRIPTION OF ENGINE COMPONENTS ....................4- 1 Cylinder A n d Crankcase ................

  • Page 5: Specifications

    1. SPECIFICATIONS EH30 Model EH30DS EH30B EH30BS EH30D Air-Cooled. 4-Cycle. Single-Cylinder, Horizontal P.T.O. Shaft, Engine Gasoline Type (3.07 2.40 in.) Bore Stroke 291 cc (1 7.76 cu.in.1 Piston Displacement Compression Ratio 7.0/1800 7.0/3600 HP/rpm HP/rpm Cont i nuous output Max. 9.0/1800 HP/rpm 9.0/3600...
  • Page 6 EH34 Model EH348 EH340S EH34BS EH34D ~~~~~ Air-Cooled, Single- Cylinder, Horizontal Gasoline Engine 4- Cycle, P.T.O. Shaft, Type Bore Stroke 61 m m (3.31 2.40 in.) Piston Displacement (20.63 338cc cu.in.) Compression Ratio Cont i n w u s 8.0/1800 HP/rpm 8.0/3600 HP/rpm...

  • Page 7: Performance

    2. PERFORMANCE 2 - 1 MAXIMUM OUTPUT The maximum output is the output of an engine with its throttle valve fully opened under the condition that all the moving parts are properly worn in after the initial break- in period. A new engine may not produce full maximum output while its moving parts are still not broken...

  • Page 8: Performance Curves

    4 PERFORMANCE CURVES OEHBOD, B CONTINUOUS RATED OUTPUT RECOMMENDABLE HORSEPOWER RANGE 2000 2400 2800 3200 3600 (1 800) 000) (1 200) (1 400) ( 1 600) REVLOUTION- - 4 -...
  • Page 9 *EH34D, B CONTINUOUS RATED OUTPUT RECOMMENDABLE HORSEPOWER RANGE 2000 2400 2800 3200 3600 (1 000) (1 200) (1 400) (1 600) (1 800) REVLOUTION- - 5 -...

  • Page 10: Features

    FEATURES 1. The overhead valve design offers a compactness, light weight and ideal combustion charastristics resulting in more power from less fuel prolonged engine life. 2. The vibration free design with the twin balancer system and lighter reciprocating parts. 3. Such parts as the large capacity muffler, dual element air cleaner, helical balancer gear type...

  • Page 11: Crankshaft

    4- 3 CRANKSHAFT The crankshaft is forged carbon steel, and the crank pin is induction-hardened. The output end B TYPE TYPE of the shaft has a crankshaft gear and balancer gear that are pressed into position. (See Fig. 3.) Fig. 4-4 CONNECTING ROD AND PISTON The connecting rod is forged aluminum...

  • Page 12: Camshaft

    4- 6 CAMSHAFT The camshaft for the D- type engine is made TYPE of special cast iron and camshaft gears are casted together in one piece. Both sides of the shaft fit into the plane bearings on the crankcase and main bearing cover.

  • Page 13: Governor System

    4- 9 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 installed in the crankcase and driven by the balancer shaft. (See Fig. 9.1 Fig.

  • Page 14: Ignition System

    4- 12 IGNITION SYSTEM is a transistor controlled The ignition system 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 (See Fig.

  • Page 15: Balancers

    4- 15 BALANCERS Unbalanced inertia force is balanced the two balancers which rotate at the same speed with BALANCER 1 the crankshaft effectively reduce vibration. (See Fig. 1 4 . ) Fig. 14 4- 16 DECOMPRESSION SYSTEM automatic decompression mechanism which AUTOMATIC DECOMPRESSOR SYSTEM opens exhaust valve before the piston reaches compression top is assembled on the camshaft...

  • Page 16: Sectional View Of Engine

    4- 17 SECTIONAL VIEW OF ENGINE /FUEL TANK FUEL FAN) FLYWHEEL (COOLING MAIN BEARING COVER...
  • Page 17 PLUG COVER ROCKER ARMS DRAIN PLUG \BALANCER SHAFT...

  • Page 18: Disassembly And Reassembly

    5. DISASSEMBLY AND REASSEMBLY 5 - 1 PREPARATIONS AND SUGGESTIONS 1) When disassembling the engine, memorize 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.

  • Page 19: Disassembly Procedures

    DISASSEMBLY PROCEDURES Part Tool remove Procedures Remarks Step (1) Remove oil drain plug and careful not to lose 14mm box wrench Oil drain drain o i l . (2) To discharge oil remove o i l quickly, the gasket. gauge. Fig.
  • Page 20 Tool Step Part to remove Procedures Remarks Air cleaner Remove air cleaner cover. careful not to lose (2) Loosen two wing b o l t s and remove washer and gasket for element. bolt. wing (3) Loosen screw on swivel and pull choke knob.
  • Page 21 Procedures Remarks Tool Step Control panel (1) Unclamp wires from breather cover. (2) Disconnect wires and bracket from connectors. (3) Loosen two bolt and remove control 8mm box wrench panel. -*.. and washer 2pcs. l O m m bolt l o r n (4) Loosen.
  • Page 22 Step ]part to remove1 Procedures Remarks Tool Speed contral Unhook governor spring from governor Note governor spring lever lever. hole on governor lever. Remove clip, wing nut, stop plate, governor lever friction plate, and speed control lever. Loosen the bolt and remove governor lever.
  • Page 23 Remarks rernovc Procedures Tool 'art to Step Be very careful not to Oil sensor Unclamp sensor cord from main damage stick (Option) bearing cover. (2) Remove oil sensor unit. sensor unit in any way. O i l sensor Remove oil sensor bracket.
  • Page 24 'art to remove( Procedures Remarks Tool Electric (1) Remove black wire from electric starter. Reattach terminal nut starter to keep it starter (2) Loosen two bolts and remove electric starter. from 12mm socket (Option) missing. .*.- 30mm bolt 2pcs. wrench ..
  • Page 25 Procedures Tool Part t o remove Step Remarks Fuel tank Loosen four flange nuts from bottom of spilt fuel Wipe fuel tank and remove fuel tank. thoroughly. M8 flange nut 4pcs. 12mm socket - 0 . - wrench FUEL TANK FUEL STRAINER Fig.
  • Page 26 Tool emarks Step Part to remove Procedures Recoil Remove recoil from blower housing. l O m m box wrench 8mm flange bolt starter 4pcs. Remove Blower blower housing from crankcase. 1 O m m box wrench .-.- housing 8mm flange bolt 4pcs.
  • Page 27 Remarks Tool Part t o remove Procedures Step Ignition coil (1) Remove plug cap from spark spark Plug- (2) Remove ignition coil from crankcase. lOmm box wrench 30mm bolt and washer 2pcs. 1 . - ~~~~ Fuel tank Remove the fuel tank bracket 14mm box wrench 25mm bolt and washer...
  • Page 28 Tool Step 'art t o remove Procedures Remarks Flywheel Remove nut from crankshaft. Flywheel can easily be 24mm socket removed wrench M16 nut lpce. Fig. 26.) striking (See (2) Remove the starting 12mm socket pulley. the head of the center 1 2 m bolt 3pcs.
  • Page 29 Procedures Tool Step \Part Remarks Exhaust Remove exhaust manifold and gasket from 12mm box wrench manifold cylinder head. M8 flange nut 2pcs. Remove intake manifold and gasket from 12mm box wrench Intake manifold cylinder head. 28mm bolt and washer 2pcs. Remove spark from cylinder head.
  • Page 30 to remove Procedures 'art Remarks Tool Cylinder (1) Remove rocker cover from cylinder 10mm box wrench head head..12mm flange bolt 4pcs. (2) Loosen adjusting bolts on rocker arms. (3) Pull out rocker shaft from the intake Mark rocker arms side of the cylinder head.
  • Page 31 Remarks Tool Step Procedures l ~ a r t t o remove1 YtZzz (1) Press down spring retainer and slide Put marks on valves, exhaust it to release from the groove of valve springs and retainers stem, then remove spring retainer and they reinstalled in valve spring.(See Fig.
  • Page 32 Part Tool to remove Procedures Remarks Step h4ai.n Remove bolts fastening main bearing c a r e f u l 12mm box wench damage oil seal. cover on crankcase. bearing 4Omm bolt and washer *--*7pcs. cover main Remove cover from Use a soft hammer and bearing Fig.
  • Page 33 Tool Procedures Remarks Step Part to remove ( I ) Camshaft (1) Remove camshaft from prevent crankcase. tappets from getting (2) Remone from crankcase. dynages , tappets tappets put crankcase cylinder down. side Fig. 37.) (See Put marks on tappets to distinguish intake from exhaust.
  • Page 34 Step l ~ a r t remove1 Procedures Remarks Tool lOmm box wrench (1) Remove connecting bolts Scrape off all carbon CoMfXthg rod and COMfXting cap. deposits that might Turn crankshaft u n t i l piston at top interfere with removal piston dead center, push out connecting rod of piston from upper...
  • Page 35 Procedures Part t o remove Remarks Tool Step Crankshaft (1) Tap flywheel lightly to move from crankshaft crankcase. Fig. 40.) (See Fig. 40 f i g .

  • Page 36: Reassembly Procedures

    5- 4 REASSEMBLY PROCEDURES PRECAUTIONS FOR REASSEMBLY Clean parts throughly before reassembly. Pay most attention to cleanliness of piston, cylinder, crankshaft, connecting rod and bearings. 2) Scrape off all carbon deposits from cylinder head, piston top and piston ring grooves. 3) Check lip of oil seals.
  • Page 37 " N " M A R K .TOP RING .SECOND RING 'OIL RING f i g . Fig. 5 - 4 - 3 PISTON AND CONNECTING ROD "OF" M A R K on connecting rod on D When installing piston type engine, match the mark "DF"on thepiston...
  • Page 38 (2) Install piston and connecting rod assembly PISTON RING COMPRESSOR into cylinder. Use a piston ring compressor to hold piston CON,NECTlNG rings. The "DF"mark of the connecting rod "D"type engine or the "BF"mark for "B" type engine is to face flywheel side when assembled.
  • Page 39 5-4-5 BALANCER SHAFT Install balancer shaft 1 (left side) and balancer shaft 2 (right side) to crankcase aligning matching marks of balancer gear and crank gear as shown in Fig. 50. Matching mark for balancer shaft 1 is one dot and that balancer shaft 2 is two dots.
  • Page 40 5 - 4 - 7 ADJUST CRANKSHAFT A N D CAMSHAFT PLAY (1) Measure end play of crankshaft and camshaft. Adjust end play to the specified values using the proper spacer. CRANKSHAFT CAMSHAFT Type D Type B Type D Type 0.1 3-0.29 m m SIDE CLEARANCE...
  • Page 41 (2) Lubricate oil seal and bearing surfaces. Add a light film of oil on main bearing cover face to hold gasket in place. Place spacers chosen at procedure on crankshaft and camshaft. Use an oil seal guide when installing main bearing cover to avoid damaging the seal.
  • Page 42 5 - 4 - 11 VALVE CLEARANCE ADJUSTMENT (1) Position piston at top dead center of compression stroke matching the mark flywheel with the mark crankcase. (See Fig. 53.) Loosen lock nut on rocker arm and turn adjusting screw to adjust the clearance between rocker arm and valve stem end.
  • Page 43 (1) Install charge coil to crankcase. Clamp coil wire to crankcase. [NOTE] Be careful not t o pinch coil wire between charge coil and crankcase. (2) Put woodruff key in keyway of crankshaft. Wipe off oil and grease thoroughly from tapered portion of crankshaft and flywheel center hole.
  • Page 44 5-4-18 FUEL TANK Install fuel tank to fuel tank bracket. 5 - 4 - 19 ELECTRIC STARTER (Optional equipment) switch to crankcase. (1) Install magnetic (2) Install diode rectifier to crankcase. (3) Install electric starter to crankcase. Connect wires referring to the wiring diagram.
  • Page 45 (5) Install carburetor to intake pipe hooking -GOVERNOR R governor rod to governor lever and throttle lever of carburetor. Hook rod spring over rod. governor (See Fig. 59.) Attach panel bracket and air cleaner base to carburetor with gaskets. Tighten two flange nuts and a bolt.

  • Page 46: Break-In Operation

    (8) Install control panel to bracket. Connect wires. (9) Put choke knob wire through grommet on cleaner base and fasten swivel on choke shaft of carburetor. (10) Put element into air cleaner and fasten with wing bolts. Install air cleaner cover. End of the reassembly 5 - 5 BREAK- IN OPERATION engine that has...

  • Page 47: Basic Theory

    B A S E THEORY of the flywheel generates electricity (1) Revolution on the primary side of the ignition coil, and the base current flows to the power transistor. Current I1 turns the power transistor "0N"and the electric current Iz flows. At lower engine revolution, when the flywheel reached the ignition point the low speed ignition timing controll circuit operates to run the base current to turn the...

  • Page 48: Wiring Diagram

    WIRING DIAGRAM STANDARD Stop Button Ignition Coil Connector Black Spark Plug " 7 7 5 - Flywheel ElNGlNE WITH ELECTRtC STARTER 1 2VOLT BATTERY MINIMUM 24 AMP.HR. DIODE RECTIFIER " " " " " " " - Fig.

  • Page 49: Automatic Decompresslon System

    7 . AUTOMATIC DECOMPRESSION SYSTEM The decompression system operates to release compression by lifting up the exhaust valve at starting. The release lever mounted on the camshaft has a flyweight a t one end and a crescent cam at the other end.

  • Page 50: Carburetor

    CARBURETOR 8- 1 OPERATION AND CONSTRUCTION 8 - 1 1 FLOAT SYSTEM The float chamber is located below the carburetor body and, with a float and a needle valve, maintains a constant fuel level during engine operation. (See Fig. 66.) The fuel flows from the fuel tank into the float chamber through needle valve.

  • Page 51: Disassembly And Reassembly

    8-1 - 2 PILOT SYSTEM The pilot system feeds the fuel to the engine during idling and low- speed operation. The fuel is fed through the main jet to the pilot jet, where it is metered, and mixed with the air metered the pilot air jet.
  • Page 52 8 - 2 - 4 MAIN SYSTEM Remove the bolt (12) and take out float chamber body (13). (2) From the body (14) remove the main nozzle (15), and then remove the main jet (16) guide holder (17) from the main nozzle (15). (3) Reassembly a) Fasten the main jet securely to the body.
  • Page 53 9. STARTING SYSTEM RECOIL STARTER When repairing recoil starter, disassemble and reassemble in the following procedures. Tools Socket wrench, Needle nose pliers, Screw driver [NOTE] “D” The following explanation is applicable to the recoil starter type engines. For “B” type models, reverse the direction of rotation achieve proper service work.
  • Page 54 Remove reel from starter case as shown in Fig. 71. Take out reel turning lightly slowly toward left and right to remove spring from the hook. Do not remove the reel quickly the spring may escape from the starter case. Untie starter rope from the knob and remove.
  • Page 55 (3) Prior to installing reel in starter case, wind 2.5 turns in the starter rope in reel for arrowhead direction as shown in Fig. 74. Then let the rope out of reel from notch on reel. Line up the hook with inner of spring and install reel in starter case.
  • Page 56 (6) Test operation of recoil starter to rope recoils satisfactorily and ratchets project and retract properly. Mount recoil starter to the engine. (7) If spring escapes from reel when disassembling recoil, hook the outer end of spring onto the notch of reel and rewind the spring into the housing.
  • Page 57 The rear cover Remove the rear cover. Fig. 4mm screws (2pcs.I (5) The (6) The brush holder. (7) "M" terminal bush No, 2. brush holde is disassembled by mm screws. (Zpcs.) ,ing the Remove the "M" terminal bush No, 2. Fig.
  • Page 58 (9) The pinion stopper clip. The pinion stopper clip is removed with standard screwdriver while pinion stopper is pushed toward the pinion. Fig. 82 (1 0 ) Pinion stopper. Pinion return spring. 2) Pinion assembly. The pinion stopper, pinion return spring and the pinion assembly can be dis...
  • Page 59 n l m m l Fig. 6 m m (2pcs.) 9. The 1. The terminal nuts pinion stopper clip 2. "M" terminal bush No,1 10. Pinion stopper (2pcs.) 1 1. Pinion return spring The 5mm through bolts 4. The Rear cover 12.
  • Page 60 9 - 2 - 2 INSPECTION AND REPAIR ( 1 ) ARMATURE a) Check the diameter of the commutator. If the out side diamaeter of the commu- tator is below the minimum Iimit then replace it. Unit Standard (New) (Used) Limit Fig.
  • Page 61 d) Check for Surface Distortion on the Arma- ture and the Commutator. COMMUTATOR Use a dial gauge to measure the distortion of the out side surfaces of the armature core and the commutator. If it is above the limit, then repair or replace it.
  • Page 62 BRUSH Measure the length of the brushes and they are under the limit, replace them. Unit Brush Positive brush side Negative side brush Fig. 92 BRUSH HOLDER a> Insulation Test for the Brush Holder. Check for continuity between the brush holder's top (Positive side) and its base (Negative side).
  • Page 63 (4) PINION CLUTCH Inspection of the pinion clutch. Rotate the pinion manually. While rotating in the direction of normal operation, of rotation smoothly reverse the direction to confirm that it locks. In the event of any irregularity, replace Fig. 9-2-3 REASSEMBLY Reassembly is in the revrse order disassembly, however please note the following points.
  • Page 64 10. TROU8LESHOOTtNG The following three conditionts must be fulflled for satisfactory engine start. 1. The cylinder filled with a proper fuel- air mixture. 2. Good compression in the cylinder. 3. Good spark, properly timed, to ignite the mixture. The engine cannot be started unless these three conditions are met.
  • Page 65 10- 1 3 IGNITION SYSTEM Check the followings for lack of sparks. Wires of the ignition coil, spark plug or contact breaker disconnected. (2) Ignition coil damaged and shorted. (3) Spark plug cable wet or soaked with oil. (4) Spark plug dirty or wet.
  • Page 66 10-5 ENGINE KNOCKS Poor quality gasoline. (2) Engine operating under heavy load at low speed. (3) Carbon or lead deposits in the cylinder head. Spark timing incorrect. (5) Loose connecting rod bearing due to wear. Loose piston to wear. (7,) Cuases of engine overheat.
  • Page 67 11. INSTALLATION Engine life, ease of maintenance and inspection, frequency of checks and repairs, and operating cost all depend the way which the engine is installed. Review the following instructions carefully for installing the engine. 1 INSTALLING When mounting the engine, carefully examine its position, the method of connecting it to a machine, the foundation, and the mehtod of supporting the engine.
  • Page 68 12. SERVICE DATA LIMITS 12- 1 CLEARANCE DATA AND Unit mm (in) ~EH%/EH34 ITEM Limit CYLINDER HEAD Flatness 0.05 (0.002) (0.004) Valve seat contact width 0.7-1 .O IN. EX. (0.079) (0.028-0.039) Valve guide inside dia. 6.600-6.622 6.75 (0.260-0.261 (0.266)
  • Page 69 mm (in) Unit EH30 EH34 Lmit Lmit CYLlNDER be rebored To be rebored Inside dia. when when t h e difference difference 84.000-84.022 78.000-78.01 9 between max. between max. and min. of and m i n . o f (3.307-3.308) (3.071 "3.072) diameter diameter...
  • Page 70 Unit (in) EH30 EH34 ITEM Limit Limit Ring groove side clearance 0.05-0.09 0.1 5 0.05-0.09 0.1 5 (0.006) (0.002-0.0035) (0.006) (0.002-0.0035) 0.03-0.07 0.1 5 0.93-0.07 0.1 5 2-0.0028: 2-0.0028> '0.001 (0.006) 0.001 (0.006) 0.01 -0.065 0.01 -0.065 0.1 5 ring :0.0004--0.0026: 0.0004-0.0026: (0.006)
  • Page 71 Unit mm (in) Limit CONNECTING end inside dia. 38.000-38.01 6 -496 -4967) Clearance between big end and crankpin 0.030-0.060 0.2 (0.0079) (0.00 1 2-0.0024) Small end inside dia. 21.010-21.023 21.080 (0.8299) (0.8272-0.8277) Clearance between small end and piston 0.01 0-0.032 (0.0047) 0.1 2 (0.0004-0.001 3)
  • Page 72 Unit mm (in) EH30/EH34 ITEM Limit CAMSHAFT 36.1 "36.3 Cam height 35.95 (1.41 54) (1.4213-1.4291) IN.EX. cams 19.967- 19.980 19.950 (0.7854) (0.7861 -0.7866) VALVE 6.535-6.550 Valve stem outside dia. 6.450 (0.2539) (0.2573-0.2579) 6.522-6.544 6.450 (0.2539) (0.2568-0.2576) valve stem dia. and Clearance between valve guide...
  • Page 73 Unit (in) EH30/EH34 ITEM Limit TAPPET Stem outside dia. 8.960-8.975 8.93 (0.351 6) (0.3528-0.3533) Guide inside dia. 9.00-9.01 5 9.08 (0.3575) (0.3543-0.3549) Tappet guide clearance 0.025-0.055 0.1 5 (0.0059) (0,001 0-0.0022) ROCKER ARM 1 1.986-1 1.994 1 1.92 (0.4693) (0.471 9-0.4722) Rocker arm hole dia.
  • Page 74 Unit mm (in) EH30/EH34 ITEM Limit VALVE SEAT ANGLE (IN. EX.) Valve cutter angle (a) Valve contact width 90" 0.7-1.0 (0.028-0.039) (0.079) TORQUE SPECIFICATIONS TIGHTENING TORQUE DESCRIPTION Cylinder head bolts 340-420 24.6-30.4 33.3-4 Connecting rod cap bolts 22.1 -27.0 16.3- 19.9 225-275 Flywheel nut 83.4-93.2...
  • Page 75 12-3 OIL GRADE CHART Comparison between viscosity and temparature Single grade Specified Lubricant aualitv Multi- grade - 20 104°F SC or higher. oil classified Multi-grade oil tends to increase its consumption at high ambient temperature.
  • Page 76 13. MAINTENANCE AND STORAGE The following maintenance jobs apply when the engine is operated correctly under normal conditions. The indicated maintenance intervals are by no means guarantees for maintenance free operations during these intervals. For example, if the engine is operated in extremely dusty conditions, the air cleaner should be cleaned every day instead of every 50 hours.
  • Page 77 13-4 EVERY 1 O Q " 2 8 0 HRS. (MONTHLY) MAINTENANCE REMARKS 1) Clean fuel filter and fuel tank. 2) Inspect cooling system and remove Remove blower housing and clean up between fins and dirt and chaff. housing. 43-5 EVERY 500-600 HRS.
  • Page 83 Industrial Engines...

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