Manuale d’uso / di manutenzione del prodotto EH12-2, EH17-2, EH25-2 del fabbricante Robin America
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CONTENTS Section Title 1 . 2 . 3 . 4 . 5 . 6 . 7 . 8 . Page 4-1 4-2 4-3 4-4 4-5 4-6 4-7 4-8 4-9 4-1 0 4-1 1 4-1 2 4-1 3 4-1 4 4-1 5 4-1 6 4-1 7.
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I. SPECIFICATIONS ~~ ~ ~~~ ~ ~ ~~ ~~ ~~~ ~~~~ ~~ ~~~ ~ ~ EH 12-2 EH12-2B EH12-2DS EHl2-2D EH12-2BS Model TY Pe Air-Cooled, 4-Cycle, Single-Cylinder, Horizontal P.T.O. Shaft, Gasoline Engine Bore X Stroke Piston Displacement 60 x 43 rnm (2.36 x 1.57 in.
EH17-2 EH17-2B EH17-2DS EH17-2D EH17-2BS Model TY Pe Air-Cooled, 4-Cycle, Single-Cylinder, Horizontal P.T.O. Shaft, Gasoline Engine Bore X Stroke ~~ ~~ ~~ ~~~~ ~ ~ 67 x 49 mrn (2.64 X 1.93 in.) 172 cm3 (10.50 cu.in.) . Compression Ratio 8.5 Output 2.6 (3.
~~~~~~ ~~ ~ EH25-2 EH25-2 6 EH25-2DS EH25-2D EH25-26s Model TY Pe Air-Cooled, 4-Cycle, Single-Cylinder, Horizontal P.T.O. Shaft, Gasoline Engine Bore x Stroke Piston Displacement 75 X 57 mm (2.95 X 2.24 in.) 251 cm3 (15.31 cu.in;) Compression Ratio 8.
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-in.
2-4 PERFORMANCE CURVES 8 0 EHlPD, B HP kW 4 3 + 3 l2 n + 0 3 1 0 2 1 for B type 2000 3000 (1 000) (1 500) REVOLUTION - r.p.m. 4000 (2000) -5-.
0 EH17D, 6 for B tvDe (1 000) REVOLUTION - r.p.m. N.m kgfam 3000 4000 (1 500) (2000) -6-.
EH25D, B HP 8 7 t: $4 & I- 2 1 0 r I I I I I I I I I I " "- I I 1 " MAXIMUM TORQUE AL I I I I I kW I I MAXIMUM HORSEPOWER '(NET) I -6 5 4 I RECOMMENDED I i N.m kgf-m 16.5 (33) 15.5 (31) 14.5 (29) 1.7 (3.4) 1.6 (3.2) 1.5 (3.0) 1.
3. FEATURES , , 1. The overhead valve design offers a compactness, light weight and ideal combustion characteristics 2. An optimum lubrication and better tilted operation thanks to upright cylinder design. 3. A crossflow arrangement of intake and exhaust ports ensures stable performance under high ambient temperature.
4-3 CRANKSHAFT The crankshaft is forged carbon steel, and the crank The output end of the shaft has a crankshaft gear, and balancer gear for EH25-2 which are pressed into position. W pin is induction-hardened. 44 CONNECTING ROD AND PISTON The connecting rod is an aluminum alloy diecasting, and its large and smalI ends function as bearings.
4-6 CAMSHAFT The camshaft for the D-type engine is made of special cast iron and camshaft gears are casted to- gether in one piece. Both sides of the shaft fit into the plane bearings on the crankcase and main bearing cover. The camshaft for the B-type engine is made of forged carbon steel and also functions as PTO shaft.
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 is installed on the main bearing cover.
4-13 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 easy starting, good acceleration, low fuel consumption and sufficient output.
4-16 DECOMPRESSION SYSTEM An automatic decompression mechanism which opens exhaust valve before the piston reaches com- pression top is assembled on the camshaft for easy starting.
4-1 7 SECTIONAL VIEW OF ENGINE FUEL TANK FLYWHEEL MAIN BEARING COVER - 14-.
a ROCKER ARM PUSH ROD - 15 -.
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.
5-3 DISASSEMBLY PROCEDURES Step Tool Remarks Procedures Part to remove I 1 14mm box wrench Be careful not to lose the (1) Remove oil drain plug and drain oil.
Step Tool Remarks Procedures Part to remove I 2 Fuel tank 1 (1) Close fuel valve. (2) Disconnect fuel hose between fuel strainer and carburetor. (3) Remove fuel tank from cylinder head. M6X14mm bolt *.-- 4pcs. (EH12-2,17-2) M8X20mm bolt 0- 4pcs. (EH25-2) ~ ~ ~~ ~~ Wipe off spilt fuel thoroughly.
Step I Part to remove I Procedures I Remarks I Tool Recoil starter (1) Remove recoil from blower housing. M6 X 8mm flange bolt - - 4pcs. 1 Omm box wrench I housing 5 Oil sensor (Option) I (1) Remove blower housing from crankcase. M6X i2mm flange bolt 4pcs.
)art to remove Muffler cover, Muffler and Exhaust pipe cover Procedures (1) Remove muffler cover and exhaust pipe cover. M6X lOmm flange bolt 0.. Spcs. (2) Remove muffler from crankcase and cylinder head. M8 nut 2pcs. M6 X 12mm flange bolt - 1 PC. M8X 16mm flange bolt - 1 pc.
Control box and Electric (Option) Procedures Tool Remarks (1) Disconnect wires. blue 1 (diode rectifier ) light blue 1 (diode rectifier ) black *** 1 (magnetic switch) (2) Remove black wires from electric starter. (3) Remove control box. 12mm socket wrench (4) Loosen two bolts and remove electric Fastened together with fuel tank.
Head cover L Air cleaner Procedures Tool Remarks (1) Remove head cover from crankcase. 1 Omm M6 X 12mm flange bolt 1 pc. socket wrench (1) Remove cleaner cover and cleaner lOmm Fastened together with element. M6 flange nut 2pcs. socket wrench carburetor.
Step 10 - 11 12 - 13 - Part to remove I ~ Procedures Governor lever, Governor rod and Governor spring Carburetor (1) Unhook governor spring from speed control lever. (2) Remove governor lever from governor shaft. M6X30mm bolt and washer -e lpc. (3) Detach governor lever, governor rod and rod spring from carburetor.
14 Ignition coil l- “ ” Procedures I Remarks (1) Disconnect ignition plug cap and remove ignition coil from crankcase. M6X25mm bolt and washer ...- 2pcs. (1) Remove starter pulley from flywheel. Place socket wrench on flywheel fastening nut and strike tip of the lever with hammer.
Step Too I Remarks Procedures Part to remove 16 Flywheel puller Use flywheel puller as (1) Remove flywheel from crankshaft. Flywheel (2) Remove key from crankshaft. illustrated below. (See Fig. 5-12.) (See Fig. 5-1 1.) ~ 17 (1) Remove charge coil. Charge coil I (Option) M6 X 25mm Screw 2pcs.
step 19 20 ~~~ ~ Part to remove Rocker cover Cylinder head Procedures Remarks (I) Remove rocker cover from cyIinder head. (2) Remove gasket. (rocker cover) M6X 12mm flange bolt ..-. 4pcs. (1) Remove cylinder head from crankcase. M8x65mm flange bolt ..
Step 21 - Part to remove Main bearing cover Procedures (1) Remove main bearing cover fastening bolts. M6X30mm bolt and washer - 8pcs. M8X30mm bolt and washer -.-. 8pcs. (2) Remove main bearing cover using plastic (EH 12-2, 17-2) (EH25-2) hammer. (See Fig.
I I Step 22 - - 23 Part to remove , Procedures 1 Cam shaft and Balancer shaft (Option for EH25-2) Tappet (1) Remove cam shaft from crankcase. (2) Remove balancer shaft. (Option for EH25-2) (1) Remove tappets from crankcase. Remarks Tool t To prevent tappets from getting damaged, put the crankcase upside down.
Step I Partto remove I Procedures 24 ~~~ Connecting (1) Remove connecting rod bolt after scraping rod and off carbon from cylinder and piston. Piston M6 X 34mm flange bolt 2pcs. (EHI 2-2) M7X37mm flange bolt 2pcs. (EH17-2) M8x46mm flange bolt 2pcs. (EH25-2) (2) Remove connecting rod cap.
Step Too! Remarks Procedures Part to remove 26 Be careful not to damage (1) Remove crankshaft tapping at the Crankshaft flywheel end. oil seal. c Fig. 5-20 c CRANKSHAIT (D type) c fig.
Step 27 'art to remove Intake valve and Exhaust valve Procedures (1) Loosen nut and remove bolt (pivot). (2) Remove rocker arms. (3) Press down spring retainer, take out collet valve, and then remove spring retainer and valve spring (4) Remove intake and exhaust valve.
5-4 REASSEMBLY PROCEDURES 0 PRECAUTIONS FOR REASSEMBLY 1) Clean parts throughly before reassembly. Pay most attention to cleanliness of piston, cylinde :r, crankshaft, connectin g rod and bearings. Scrape off all carbon deposits from cylinder head, piston top and piston ring grooves.
Fig. 5-28 5-4-3 PISTON AND CONNECTING, ROD (1) When installing the piston on the connecting rod, place the valve rcess of the piston crown as shown in the illustration to the "MAG" side of the connecting rod. Apply oil to the small end of the connecting rod, piston and piston pin before installation.
(2) Install the piston and connecting rod assembly into the cylinder. Use a piston ring compressor to hold the piston rings. Place “MAG” side of the connecting rod on the magneto side of the crankcase. [NOTES] (1) Apply enough oil to piston rings, connecting rod bearings and cylinder bore before assembly.
5-4-5 BALANCER SHAFT (Option for EH25) Install balancer shaft aligning the timing mark on the balancer shaft gear and the balancer gear on the crank shaft as shown in the illustration. Incorrect timing of the gears will cause matfunction of the engine and may result in damage due to interference of the parts.
5-4-7-1 CRANKSHAFT END PLAY (For D type and B type) (1) Measure the depth “Al” (From the mating surface to the inner race of the ball bearing.) (2) Measure the height “Bl” (From the mating surface to the crank gear.) (Al+ 0.3) - Bl=SIDE CLEARANCE (mm) (SIDE CLEARANCE) - 0.
MAIN Fig. 5-36 (2) Lubricate the oil seal and bearing surfaces. Add a light film of oil on the main bearing cover face to hold the gasket in place. Place spacers chosen at procedure (1) on crankshaft and camshaft. Use an oil seal guide when installing the main bearing cover to avoid damaging the seal.
5-4-8 CYLINDER HEAD (1) Clean carbon and gum deposits from the valves, seats, ports and guides. Inspect the valves, valve (2) Replace valves that are badly burned, pitted or warped. (3) When installing the valves in the cylinder head, oil the valve stems and insert them into the valve guide.
(2) Loosen the nut under the rocker arm and turn the bolt (pivot) to adjust the clearance between the rocker arm and the valve stem end. Tighten the nut under the rocker arm. I Valve clearance I I 0.08-0.1 2 mm 0.0031 -0.0047 in. I Check operation of valves by turning crankshaft.
1 Tightening torque I I 59-63 N-m I 600-650 kgocm I 43-47 ft*lb I 54-13 IGNITION COIL Install the ignition coil to the crankcase. Adjust the air gap between the ignition coil and the flywheel using a thickness gauge (filler gauge) and tighten the bolts.
(3) Connect the speed control lever and the governor lever with the governor spring. The governor spring ’ (4) Turn the speed control lever all the way toward the high speed position and make sure that the throttle (5) Turn the governor shaft clockwise all the way using a screw driver, and tighten the lock bolt and nut.
54-17 AIR CLEANER Install the air cleaner gasket and the cleaner case and tighten them with 2-M6 flange nuts. Then install the element and the cleaner cover. 5-4-1 8 HEAD COVER Install the head cover to the cylinder head. M6 X 12mm flange bolt ..a- 1 PC.
5-5 BREAK-IN OPERATION B An engine that has been completely overhauled by being fitted with a new piston, rings, valves and connecting rod should be throughly RUN- IN before being put back into service.
2) At the higher engine speed Rotation of the flywheel generates the current I1 as this current flows through the base terminal of the power transistor, it is activated and the current IZ starts of flow.
6-3 WIRING DIAGRAM STANDARD Stop switch Connector Black Black > Spark Plug Ignition Coil Flywheel ElNGlNE WITH ELECTRIC STARTER DIODE RECTIFIER I """"_"""" I L 12VOLT BATTERY MtNIMUM 24 AMP.
7. AUTOMATIC DECOMPRESSION SYSTEM EH12-2, 17-2, 25-2 engines are employing the automatic decompression system as a standard feature. This enables easy and light start of the engine. The automatic decompression system releases the compression of the engine by lifting up the exhaust valve at the cranking.
8. CARBURETOR B 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 the engine operation. The fuel flows from the fuel tank into the float chamber through the needle valve.
8-1-2 PILOT SYSTEM The pilot system feeds the fuel to the engine during idling and low-speed operation. /"l The .fuel is fed through the main jet to the pilot jet, where it is metered, and mixed with the air metered by the pilot air jet. The fuel-air mixture is fed to the engine through the pilot outlet and the by-pass.
8-2-4 MAIN SYSTEM (1) Remove the bolt(l2)and take out float chamber body(l3). B (2) From the body (14) remove the main nozzle (15), and then remove the main jet (16) and guide holder (17) from the main nozzle (15). (3) Reassembly a)Fasten the main jet securely to the body.
9. STARTING SYSTEM 9-1 RECOIL STARTER Equipments to be prepared : Driver, Pinchers (Pliers) and Protective Glasses WARNING starting the disassembly; make sure to wear the protective glasses. 9-1-1 Disassembly Steps I / (1) Setting off the spring power -1 : Hold the starter knob and extract the starter 1 rope.
WARNING Before starting the assembly, make sure to wear the protective glasses. 9-1-2 Assembly Steps GREASE PASTING (1) Setting the reel into the case. -1 :Paste grease on the case. (Fig. 9-3) -2 : Adjust the position of the inner end of the spring, which is set in the reel.
-1 i Push the latchet-guide lightly by hand so that the latchet guide won’t move and tighten the set-screw. (4) Storing the spring-power. -1 :Hold the case tight and using both hands, wind up the reel counter-clockwise 6 times. -2: Set the ree to keep the position, whereby the rope hole of the reel and the rope guide make a direct line.
(6) Test the operation of the recoil starter to see if the rope recoils satisfactorily and the ratchets project and retract properly. Mount the recoil starter to the engine. (7) If the spring escapes from the reel when disassembling the recoil, hook the outer end of the spring onto the notch of the reel and rewind the spring into the housing.
IO. TROUBLESHOOTING The following three conditionts must be fulfilled 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.
10-1-3 IGNITION SYSTEM Check the followings for lack of sparks. (1) Wires of the ignition coil, spark plug or contact breaker disconnected. B (2) Ignition coil damaged and shorted. (3) Spark plug cable wet or soaked with oil. (4) Spark plug dirty or wet.
10-5 ENGINE KNOCKS (1) Poor quality gasoline. (2) Engine operating under heavy load at low speed. (3) Carbon or lead deposits in the cylinder head. (4) Spark timing incorrect. (5) Loose connecting rod bearing due to wear. (6) Loose piston pin due to wear.
11. INSTALLATION Engine life, ease of maintenance and inspection, frequency of checks and repairs, and operating cost all I) depend on the way in which the engine is installed.
12. SERVICE DATA “STD” in the following table is the parts dimension from the brand new engine or the spare parts. Whereas, “Limit” shows the maximum allowance for the parts to be used on the engine. If the measurement exceeds beyond the “Limit”, the part needs to be replaced and/or repaired.
Unit: mm (in) EH 1 2-2 EH 1 7-2 I ITEM Lmit STD STD Lm it To be rebored when the lifference letween ma. snd min. of jiameter .cached to 0.1 :0.004). -0 be rebored vhen the lifference letween ma. nd rnin. of jiameter eached to 0.1 0.004). CYLINDER Inside dia.
Unit: mm (in) ITEM 2Y LIN DER inside dia. B Roundiness after reboring. Cyiindricity after reboring. PI STON 0 Piston size (At skirt in thrust direction) STD 1 st reboring 2nd reboring STD 1 st 01s 2nd OJS r EH25-2 STD 75.000 - 75.01 9 2.9528 - 2.9535) 75.
Uni : rnm (in) T EH17-2 ITEM STD Limit STD Limit 0 Ring groove side clearance 0.030 - 0.075 (0.001 2 - 0.0030) 0.1 5 (0.006) 0.15 (0.006) 0.035 - 0.080 :0.0014 - 0.0031) 0.030 - 0.075 (0.001 2 - 0.0030) 0.1 5 (0.006) 0.025 - 0.070 (0.0010 - 0.0028) 0.
Unit: mrn (in) 1 Ring groove side clearance I Piston pin hole ~rn Piston pin outside dia. Clearance between piston and cylinder at skirt area. I Piston ring end gap 2nd Oil ring TOP 2nd oil ring EH25-2 STD 0.050 - 0.090 1.0020 - 0.0035) ~ ~ ~ ~~~~~ 0.
Unit: mm (in) ITEM EH 1 2-2 STD Limit ZONNECTING ROD D Big end inside dia. 26.000 - 26.01 3 (1 -0236 - 1.0241) 26.1 (1.0276) Clearance between big end and crankpin 0.020 - 0.046 (0.0008 - 0.001 8) 0.2 (0.008) I 0 Small end inside dia. 13.08 (0.51 50) 13.
m- ITEM - EH 1 7-2 STD CONNECTING ROD 0 Big end inside dia. Clearance between big end and crankpin Small end inside dia. Clearance between big end and crankpin Small end inside dia. 0 Clearance between small end and piston pin Big end side clearance I CRANKSHAFT 0 Journal dia.
lTEM F EH25-2 ~ STD 0 Clearance between big end and crankpin 0 Small end inside dia. t I 0 Clearance between small end and piston pin 0 Big end side clearance I CRANKSHAFT 0 Journal dia. - I 34.000 - 34.01 6 (1.3386 - 1.3392) 0.025 - 0.057 (0.0010 - 0.
Unit : mrn (in) EH12-2 / EH17-2 ITEM STD Limit CAMSHAFT 0 Cam height 29.6 - 29.8 (1.165 - 1.173) 29.45 (1.1 59) IN.=. CAMS I Journal outside dia. "D" type 16.973 - 16.984 (0.6682 - 0.6687) 16.95 (0.6673) Dl Dl 14.973 - 14.984 (0.5895 - 0.5899) 14.
Unit: mm (in) ZAMSHAFT Cam height a Journal outside dia. 'D" type ITEM IN.=. CAMS Dl VALVE Valve stem outside dia. Clearance between valve stem dia. and valve guide "P 1 .. .. .. .. .. .. .. .. Valve clearance D2 IN. Ex. IN. EX. IN ./EX.
ITEM TAPPET 0 Stem outside dia. 0 Guide inside dia. 0 Tappet guide clearance VALVE SPRING FREE LENGTH Unit: rnrn (in) 1 STD 7.960 - 7.975 (0.31 34 - 0.
Unit: mrn (in) ITEM TAPPET Stem outside dia. Guide inside dia. 8 0 Tappet guide clearance VALVE SPRING FREE LENGTH ~~ ~ ~~~ I ITEM VALVE SEAT ANGLE(IN. EX.) 0 Valve cutter angle(a) 0 Valve contact width(b) a EH25-2 STD Limit 7.960 - 7.975 (0.31 34 - 0.
12-2 TORQUE SPECIFICATIONS EH12-2 / 17-2 type TIGHTENING TORQUE N*m ft- Ib kg cm DESCRIPTION Cylinder head bolts 5.7 - 7.2 80 - 100 7.8 - 9.8 Main bearing cover bolts 43 - 47 600 - 650 58.8 - 63.7 Flywheel nut Connecting rod cap bolts 16.6 - 19.5 230 - 270 22.
12-3 OIL GRADE CHART Specified Lubrican Quality T- Single grade Multi- grade Comparison between oil viscosity and temparature I I I I I 1 I I I - 20 - 10 0 10 20 30 40 "C -4 14 32 50 68 86 104 "F Use oil classified as SE or higher. Multi-grade oil tends to increase its consumption at high ambient temperature.
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.
13-4 EVERY 100-200 HRS. (MONTHLY) MAINTENANCE I MAINTENANCE I REMARKS I ~ 1) Clean fuel filter and fuel tank. 2) Inspect cooling system and remove dirt and Remove blower housing and clean up between fins and housing. chaff. 13-5 EVERY 500-600 HRS. MAINTENANCE I MAINTENANCE I REMARKS I I 1) Remove carbon from cylinder head.
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SU6ARU ~bin America, Inc. 940 Lively Blvd. l Wood Dale, IL 60191 l Phone: 630-350~8200 l Fax: 630-350-8212 e-mail: sale.s@robinamerica.com l www.robinamerica.
Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il Robin America EH12-2, EH17-2, EH25-2 è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del Robin America EH12-2, EH17-2, EH25-2 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Robin America EH12-2, EH17-2, EH25-2 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Robin America EH12-2, EH17-2, EH25-2 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Robin America EH12-2, EH17-2, EH25-2, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del Robin America EH12-2, EH17-2, EH25-2.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il Robin America EH12-2, EH17-2, EH25-2. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo Robin America EH12-2, EH17-2, EH25-2 insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.
