satoh s650g hydraulic pump free sample

SATOH TRACTOR f L s-65()G REnAIR MANML SATOH AGRICUTTURAL MACHINE MFG. CO*LTD,

1. Lubrication System - General 39 2. Disassembling the Oil Pump .. .. 40 2-1 . Removing the Oil Pump 40 2-2. Disasembling the Oil Pump 40 3. Checking, Maintenance and Limit of Adiustment 40 3-1 . Checking and Adjusting the Oil Pump 40 3-2. Oil Filter Replacement 41 3-3. Checking and Adjusting the Oil Pump Driven Gear Shaft 41 34. Adjusting the End Play of Oil Pump Driven Gear Shaft 42 4 tT"I?"ruili,ff": : 42 42 : 42 5, Specif ications .42 51. Oil Pump Specifications .42 j 5-2. Oil F ilter Specif ications .42

1. Cooling System - General - . 43 2. Disasembling Order . . 43 2-1 . Removing the Water PumP 43 2-2. the Water PumP Disassembling 43 3. Checking Maintenance ?nd Limit of Adiustment 4 31 . lnspection of Water PumP . . M 3l2. Checking the Thermostat 4 *4. AssemblingtheWaterPumP .... .. 4 5. Mounting thg Water Pump . . . . . . . . . . 45 6. lrstalling the Thermostat . . . . . . . . . . 45 7. Specifications .. .. 45 7-1 . WaterPump r. . . . . . . . . . . . . 45 7-2. ThgrmosEt.. ,o....o. 45

1. Fuel System - .Generct 47 2. AirCleaner oo. . . 47 2-1 . Rennving the Air Cleaner Element 47 2-2. Checking the Air Cleaner . . . . 47 2-3. Air Specifications . Cleaner . 47 Fugl Pump...,..... 47 31 " Removing the Fuel Pump . . 47 3-2. Disasembling the Fuel Pump . . 48 3-3. Checking the Fuel Pump 48 34. Assembling the Fuel Pump . . 48 35. lnsUlling the Fuel Pump 49 36. .. Fuel Pump Specifications . . 49 4. Fugl Filtgr . . . . . . ... . , . . . . 49 5. Carburetor .. .. 50 51 . C"onstruction . . 50 5-2. the Carburetor Disassembling 50 $3. Checking, Maintenance and Limit of gOiustment 54 5.4. Assembling the Carburetor . . 55 t5. MountingtheCarburetor .... . 55 $6. Specif ications . . 55 6. Governor .55 6-1. Governor System - General 55 6-2. Governor - Operation and Construction .56 6-3. Purpose of Governor Adjustments .58 &4. Maintenance .58 6-5. lnterlock Adjustment between C;rburetor and Governor .58

6. GoYernor2. Cylinder Block The Governor is of f ly weight type and controlled by The cylinder block is precisioncast from a light alloy means of all speed governor system. meEl by means of pressure die casting. To support the crankshaft, f ive bearings of the deep skirt type are employed. The cylinder liners are made of special 7. Cooling System cast iron and replaceable. They are directly cooled by water and sealed with two "4" rings. Cooling system is the type of forcedcirculation, and the pressure in the radiator is 9.954 lbs/sq. in. by which the high efficiency of heat radiation is secur-3. Pistons and Crankshaft ed. Their qystem is incorporated with the Wax type thermostat and the water pump is of the centrifugal The pistons are of a conical ellipse type manufacturd type. The miterial of cooling fan is the synthetic by LO-EX. The crankslraft is made of ductile cast resin, consisting of 4 wings, iron supsior in durability and wear-resistance, and supported by five main bearings. The main bearings are made of an aluminum alloyed with tin, which is 8. Lubricating Mechanism also excellent in durability and wear-resistance. Total pressure lubrication is carried out by a trochoid gpar oil -pump, which is driven by the cam shaft drive4. UalYe Meclnnism gear. A cartridge type oil f ilter is employed.

Figr" 7 end I 10. Removing the hydraulic oil pipe a. Remove the hydraulic oil pipe clamp (A).Fis. 5

b. Remove the magnet plug (B), and drain off the hydraulic oil case. When reusing the oil, put it in a clean container while taking care not to allow dust to enter the oil.

Fig. l3 11. Removing the hydraulic pump and pump bracket. Remove the four bolts setting the pump joint (A), and remove the pump joint. Remove the four nutsFig. l0 (B) from the pump (C). Remove the two screw (M8 x 25l, and three bolts (MB x 45) from the c. Remove the banjo bolt (Cl" pump bracket, and remove the bracket (D). Note: As alignment of the center line betureen crankshaft and the hydraulic oil pump had been correctly fixed at 0.001 181 in. (0.03 mm) during factory assembly, do not attempt to remove the pump unless otherwise it is definitely necsary to work out its remowt.

e. Remove the pump flange mounting bolt (E) from both inlet and outlet sides. Cover the ends of the pipe so that no dust will enter the pipe. EN G INE

"Removing the water pump Pull the inake rnanifold water hose (A) out of the water pump by loosening the clip. b. Unscrew four nuts, and remove the alternator stay (C) and water pump (B) from the cylinder head.

8. Removing the cooling fan and cooling fan oom- plete a. Unscrew four bolts, and remove the cboting fan (A) , fan spacer, pump pulley (B) from the cooling fan complete. b. Unscrew three nuts, and remove the cooling fan complete (C) and alternator strap from the rylin- der head.

13. Removing the intake manifold Unscrew eight nuts and remove the engine hanger (A). Then remove the intake manifold (B) fromFig. 42 the cyl inder head, together with the governor cover stay and the a ir cleaner stay mounted I 1. Removing the fuel filter thereon. a. Unscrew the carburetor connecting bolt, and remove the f uel hose (Al connected to the carbu retor. b. Unscrew two nuts, and remove the fuel pump (B) from the cylinder block. Then remove the in- su lator. c. Remove the oil pressure switeh (C) and the breather pipe (D).

15. Removing the rocker arm cover 18. Removing the oil pump drive gear shaft. Unscrew two bolts and remove the rocker arm a. Unscrew two nutS and remove the oil pump drive cover from the cYlinder head- gear cover (A). b. Unscrew three nuts and remove the blind cover (B). c. Lift off the oil pump drive gear shaft (D) together with the shim (E) and the thrust washer (C)"

n. Removing the oil pump. a. Loosen the conn€tion nuts and detach the oil pipe (A) from the cylinder block. b. Unscrew two nuts and remove the oil strainer (B) from the oil pump (C). c. Unscrew four nuts and lift up the oil pump.Fis. 53

1 . Check the camshaft distributor drive gear and oil ,- pump drive gear (A) for damagp and wear, and the , t ,

9. lnstalling the oil pump and oil strainer a. lnsert the oil pump from above the cylinder block and secure it with four nutS. Then, f it the oir pipe to the cylinder block and oil pump.

b. Secure the oil strainer to the oil pump with two nuts. Note: lnsert the "Oo" ring (A) into the oil strainer as shown in Fig. 1 16-

18. lnstalling the oil pump driven gear assembly 19" lnsert eight tappet floors into the cylinder block. a. lnsert the oil pump driven gear asembly (B) , shim (C) and thrust washer (A) into the cylinder block as shown in Fig. 125,and fit them to the oil pump drive shaft and fre camshaft drive gear. Tighten the oil pump drive g€r cover (D) to 6.6 ft-lb (0.9 m-kg). Note: Be sure to fit the c"O" ring to the drive gpd oover.

b. Check the end play of the oil pump driven gpar assembly, and if the measured value is in the range of 0.002 ^.,0.004 in. (0.05,-" 0.1 mm), it is good. lf it is not satisfactory, check the shim and/or thrust washer. Note: For the kind of the shim and the thrust , refer to Para. "Checking and Adjusting washer the Oil Pump Driven Gear Shaft" on page 41. c. Secure the blind cover together with the packings to the cylinder block with three nuts.

b. Secure the fuel pump to the cylinder block with two nuts. Fig. 137 Fig. l g8 c. connect the fuel hose to the carburetor and the fuel pump outlet. b. Align the marks on the distributor drive gear and housing as shown in Fig. 138. c" lnstall the distributor in the timing chain cover. Note: When meshed with the drive gear on the camshaft, the mark on the distributor drive gear moves by 49o counterclockwise due to the gear twist. d. Connect the vacuum advance hose to the carbu- retor and the distributor.

a. Connect the water hose to the intake manifold and and cooling fan (D) to the pulley boss of the the water pump. cooling fan complete in that order as shown in F ig. b. Secure the water pump (A) together with the 142 with four holding bolts. packings to the cylinder head with two nuts. c. Secure the altemator stay (B) to the water pump f" with two nuts.

Fig. l6 c. Fit the V-belt (C) to the idle pulley, governor pulley, and pump pulley. Fig.r4 d. Tighten the adjusting bolt (D) to adjust the tension of the V-belt so that the governor lock nut (E) may be tightened to the specified torque of 30. lnstalling and adjusting the idler assembly, governor pulley and V-bett 36.2 ft-lb (5 kg-m). a. e. Floute the adjusting bolt as shown in Fig. 147 so Secure the idler assembly to the timing chain cover and cover bracket with turo nuts and one bolt. that the V-belt f lexes 0.55 - 0.78 in. ( 14 "> n mm) tin case of tension of sorne 22.05 lb (10 fg)) by depressing with fingers midvray between the pulleys. lf the belt new one, adjust the f lexion is a of the belt to 0.55 - 0.67 in. ( 14 - 17 mm). f. Secure the governor cover to the governor stay and governor bracket with three bolts.

cartridge type. Lubricant circulates as shown in Fig. 1. After filtered through the oil pan strainer, it is drawn into the oil pump. ln theoil pump, the pressure of lubricant is maintained at a constant level of 53.9 lb/inz (3.8 kg/cmz ) by means of the oil pump pressure control mechanism" The oil returns to the oil pan after lubricating every necessary part of the engine as indicated by the arrow.

2" Disassembling the [Iil Pump STD clearance between | 0.00$ "^" 0.01 1 in. pump booy and outer rotor | (0.20 - 0.27 mm)

2. Remove the pump cover (B), outer rotor {C) and pump drive shaft assembly (D) from the pump body (A). Fig. 156 3. Remove the split pin (H). Pull out the spring seat (E), pressure control spring (F) and pressure 2. Clearance between the oil pump cover and outer @ntrol plunger (G) from the pump body. rotor: Measure the clearance between the oil pump cover Note: Take c;rre of that the spring seat and pressure control spring will not spring out wtren and outer rotor with a straight scale and a the split pin is remored. special tool (No. N026 STANDARD F EE LE R GAUGE). Replace both parts if the measurernent exceeds the maximum limit.

STD clearance Max. allow Clear. between clear oil pump cover and outer rotor 0.001g ,v 0.0039 in. 0.OO59 in. (0.04 a,Q.1O mml (0.15 mm) (D)-

3. Checking, Maintenance and Limit 0f Adjustment 3-l . Checking and Adiusting the Oil Pump Fig. 157 o Wash and clean the parts removed from the oil pump. 3. Oil pump cover C lnspect the parts for cranking, heavy damage and Check the oil pump cover bottom (contacting breakage. If any of these parts is found faulty, surface with oil pump body, inner rotor and outer replace it. rotor) . lf stepped wear is found, replace the cover. lf the wear is slight, smooth it out. J. Clearance between the oil pump body and outer rotor: oil pump body Measure the clearance benrueen the and outer rotor with a special tool (No. N026 STANDARD FEELER GAUGE). Replace both if " t"re measurement exceeds 0.0118 in. (0.30 mm). LUBRICATION SYSTEM 41

4. Clearance between the oil pump drive shaft as" sembly and pump body/pump cover bearing 3-2. Oil Filter Replacement Measure the clearance between the oil pump drive shaft assembly (1 ) and the pump body l2l and 1. Replace the oil f ilter (cartridge type) after 300 pump cover (3) bearings (A) and (B) . lf the hours of operation (First replacement: after 30 measurement exceeds the specif ied maximum hours of operation). Replacement must be made limit, replace the parts. asan asemblY.

Clear. between STD clearance Max. allow clear 2. Oil filter - removal and installation drive shaft ass"y a. Use the special tool (No. 0490130 OIL FILTER and pump body 0.0003 (0.007 - 0.0018 in. 0.0O39 in. (0.1 mm) WRENCH) (A) as shown in Fig. 161 to remove the cover bearings - O.O47 mm) oil filter. b. Apply engine oil to the oil filter gnsket, and bolt it to the cylinder block with a specified tightening torque "7 .2 - 10.8 ftob (1 .0 - 1 .5 m-kg). Note: After the insullation, make sure that no oil leks.

5. Pressure control sPring Check the pressure control spring for any defects lf it fails to meet the specifications given in the table below, rePlace it. Fig. l6l Pressure control spring specif ications 3-3. Checking and Adiusting the Oil Pump Driven Gear Free length 2.16U in. (55 mm) Shaft Length - when installed. 1.6929 in. (43 mml Load - when installed 5.91 lbs. t2.68 kg) 1. Remove the blind cover (A) .

2. Check the oil pump driven gear shaft (B) for damage and breakap of teeth. -t 42 LUBRICATION SYSTEM

Oil pump can be mounted by means of the reverse order for assembling the engine. (See 3-1 Assembl- ing the Engine of Chapter Engine)Fig. 162 Note: The following-listed engine oils are com- mendable. 3. Measure the oil pump driven gpar shaft"s end play by use of a special tool (No. N026 STANDARD FEELER GAUGE}. 5. Specifications Driven gear shaft"s end play I 0.002 - 0.O04 iffi|trre.l mml in. 5-1. Oil Pump Specificatiom

The forcedcirculation cooling system is imployed with a centrifugal water pump, four"blade cooling fan, and wax"type thermometer. Fig" when the temperature of the cooling water is low, it circulates in the direction of thearrowwith a dotted line in l O4. When the temperature is high, the cooling raater flows in the direction of the arrow with a solid line.

1. Loosen the scr€nil and bolt, and remo\re tte end plat (B). 165 2. Pull out the water pump impeller (A) by using the ., speial tool (No. 04901 10 WATER PUMP 3. Take out the floating seat and cu$rion rubber IMPE LLER PU LL}. from the water pump impeller. J COOLING SYSTEM

4. Pull out the water pump pulley boss (G) by using a Whenever the water pump is disassembled, the press. water seal should be replaced with a new one.

8. Disassemble tlre ball bearing and water pump shaft into three parts: pump straft (El, ball bearing (K) and spacer (J). For this operation, use a prs.

1, Follow the disassembling procedures in reverse order.Fig. 166 2. Notes on water pump rsslrUling a. Be sure that the two ball bearings are placed with3. Checking Maintenance and Limit 0f the unsealed side facing toward the spacer. Adiustment b. Feed Albania Grease Nos. 2 and 3 so that one-third of the space between the dust seal plate 3-l . lnspection of Water Pump c. and the ball bearing is f illed with the grease. Slightly apply grease to the contacting surfaces between the floating seat and water seal. 1. Check the disasembled parts for the following- listed defects. lf any of them is found faulty, d. After assembling the water pump, rnake sure that replace it. the ball bearing turns smoothly without excessive play and noise. a. Cracks and damage of the water pump body. b. Cracks and damage of the water pump impeller. c. Play and noise of the ball bearing. " d. Damage of the water seal. COOLING SYSTEM 45

- in reverse order. For details, refer to "3-1. Assembling the Engine of Chapter. Engine. Type: Centrifugal Notes: Water PumP Pulley ratio: 1 : 0.8 1) Replace all packings with new ones. Water seal: Mechanical sealr 2", Adjust the V-belt so that it will have an up and down movement of 0.55 - 0.79 in. (14

The carburetor is Nihon Kikaki-made. Stronberg type, 210028-061, double-venturi, single carburetor. The fuel pump is of mechanical type (PU56U), made by Nihon Kikaki, and the pump rocker arms are operated by cams attached to the cam shaft. The gasoline filter is of cartridge type, which provides easy access to seryie, while the air cleaner is of oil bath type.

Fig. t 68 Type: Oil-bath type Rated air flow rate (max.): 4,731 .2 gal/min 2-2. Ghecking the Air Cleaner (1,250 [/min) Cleaning efficiency: 95o/o 1 . check the air cleaner element (A) for dirt ac- (lnitial stage - full tife) cumulation and clogging. lf necessary, wash and clean it. 3. Fuel Pump 2. Check the oil pan assembly for diny oil. lf the oil is found dirty, replace it. $1 . Removing the Fuel Pump 3. Check whether the oil level in the air cleaner oil pan assembly is between the upper and lower level 1. Remove the clip, and disconnect the fuel hoses (A) I ines. lf necessa ry , refill with oil . An incorrect oil from the fuel pump (B) at the both inlet and level will reduce engine performance, and there- intake sides. ffi FUEL SYSTEM

2. Renrove the two nuts, and remo\€ the fuel pump. 3. Remove the diaphragm (D) and diaphragm spring (E) from the body.

2. Remove the two screws, and remove the valve (C) 3-3. Checking $e Fuel Pump from the hotsing 1. Checking the fuel pump a. Check the valve spring for breakage and fatigue. lf the spring is found faulty, replace it. lf the valve is found open, . even though slightly, it should be replaced. b. Check the diaphragm for breakqe, damage and aging. lf it is found faulty, replace it. c. check the diaphragm spring for breakage and fatigue. lf found faulty, replace it. d. Check the rock arm bearings for excessive pray. (Fis. 171)

$4. Asembling the Fuel PumpFig. In follow the disassembling procedures in r€verse order. FU EL SYSTEM 49

3-5. lnstalling the Fuel Pump found faulty, replace it as a unit assembly. When replacing the f uel f ilter, make sure that it is Follow the removal procedures in reverse order. installed correctly in direction and no fuel leaks. After installation, make sure that no fuel leaks.

Link --Strainer pump Rod Float Valve Sea Float Valve SPring Damper Spring Float Pin Piston Shaft Float / .--/ Piston Leather Float Room Pump Piston lnlet Check Valve

Outlet Check Valve Slow Economizer \*inJet Pump Nozzle Large Venturi ldle Adiusting Scrwv Small Venturi Slow Port Throttle Valve ldle Port Fis. 176

in. (0.42 mm) in diameter, and therefore, it is ceftain position. Overflowing caused by the ex- with f ine dust. The slow jet is easily clogged cessive vibration can be protected by means of the designed to be removed with a screw driver, hole on the f loat. providing great convenience to service- 4. Acceleration"pump c ircu it 3. Float circuit The acceleration-pump circuit includes a vacuum The f loat system consists of the f loat valve and the piston linked to a throttle valve, and consists of a float, and its purpose is to maintain constant the pump piston, inlet check valve, outlet check valve level of fuel in the float chamber. The fuel which and pump nozzle. is fed from an mechanical fuel pump at a pressure The .1.mp piston is separated into two sections, of 1.42 A, 2.13 lb/inz (0.t - 0.15 kg/cmz ) is which is connected by a pin fitted in holes in the filtered by the strainer located at the carburetor piston shaft, and is provided with a damper spring. inlet, and flows into the float chamber through the Accordingly, when the pump piston comes to clearance between the float ralve and the valve contact the cylinder bottom, the pump rod is seat. pushed by the pump arm. Then the damper spring As the f uel level rises, the float also rises, and the contracts, and as a result, the pump arm and f loat valve moves upward accord ingly. ln this throttle rnlve operate so that the valve becomes way, the float valve is finally forced tightly against fully opened. the rnalve sat, thus stopping the fuel flow to the When the throttle valve quickly opens from the float chamber. Then, if the fuel level drops, the fully-closed position, the pump piston is pushed float moves down and releases the float valve so downward by means of the pump arm, connecting that the fuel inlet is opened. ln this manner, in rod, and pump arm link connected to the throttle actual operation, the f uel is maintained at a valve rod. The fuel under the piston causes the practically constant level. The float level of this inlet check valve to close, thereby stopping the carburetor is 0.616 t 0.039 in. (15.5 mm t 1) reverse flow of fuel to the t loat chamber. above the bodytop. Therefore, the carburetor can As a result, the outlet check-valve opens and the be tilted 14o at maximum so that it provides fuel is sprayed into the air stream through the smooth engine start and idling on a slope. pump jet. The acceleration fuel is sprayed to the narrowest area of the large venturi, where the air flow speed is highest, and accordingly, the atomization of f uel .9; is made easy oF sltr When the throttle valve closes from the fully- Se opened position, the piston moves up and the dg pressure under the piston becomes negative. This rnakes the inlet check valve (in the float chamber) open, and the .fuel in the float chamber is drawn out. Then, the outlet check valve closes and prevents the reverse flor of air from the pump jet. 6.669 in. (17 mm) 1.OO4 in. (25.5 mml ln this way, the acceleration pump correctly operates. A spring is inserted between the pump rod and theFig. 177 upper body, and prevents the excesive play of the pump rod link and pump arm. lt also prevents The float chamber vent is provided immediately Two holes are provided on the side opposit to the before the choke valve; that is, it employs the pump piston, and the fuel spray amount can be inner vent system. This prevents the air-fuel chagned by inserting the connecting rod into the mixture from becoming rich due to the clogging of inner hole or the outer hole. the paper filter element. ln general, the acceleration spray amount of f uel The f loat is made of oil-resistant foamed rubber. varies according to the operating conditions of the " Unlike a conventional type f loat, it is not hollow- engine as well as to the conditions of climate. FUEL SYSTEM

Normally, the amount of fuel spray is less in closing the choke valve. The choke valve is summer than in winter. attached to the choke valve shaft with two screws, With the connecting rod in the outer hole, the which is positioned eccentrically in relation to the pump spray rate is 0.000528 pt (0.3 cc) per stroke a ir horn.

throughout the v@r, but when the rate has The choke valve shaft is coupled with the choke decreased due to the wear of the pump leather and lever by means of the choke valve spring. other defects, the inner hole should Oe used for The choke lever is fitted with a link. When the optimum spray q uantity. choke lever is pulled, the link makes the throttle As mentioned earlier, this carlruretor"s pump lenrer open so that the opening is suitable for nozzle also serves as auxiliary fuel sr/stem. When starting. Then, if the starter is turned, a rich the engine runs at high speed or with high load, a mixture is obtained, and ea$/ starting is assured. large amount of air is required and the neptive When the engine is started, the vacuum in the inlet pressure affmting the pump nozzle raises the pipe increases and the choke valve, being affected outlet ctreck valve weight. The fuel is drawn out by negative pressure, overcones the spring ten- through the purnp nozzle and mixed with air. The sion. ln this stage, the choke valve opens properly pump weight overcomes the negative pressure until so that the over choke is prwented and the engine the amount of air drawn in reaches a certain level, continues sunning. and causes the chgck valve to close. Thus stops its As the engine is rmarmed up, the choke button is rrrork as auxiliary fuel system. depressed to open the choke valve properly. After the engine is fully vrarmed up, the choke rralve 5. Surting system fully opens and the thronle valve opens to a The starting system of this carburetor includes the specified idl ing opening. choke valve linked with the choke button on the The use of the choke valve in the position closer to dash board and the fast idle system coupled with the closed position will result in greater fuel the choke valve. consumption. when you stop your tractor wh ile When the choke button is pulled, the choke lever, travelling, depress the choke button as far as the which is linked by a cable, is also pulled, thereby engine will not stall.

2. Removing the link mechanism a. Remove the throttle return spring (A). b Remove the split pin, and remove the choke connecting rod (B) from the throttle lever. c. Remove the split pin , a nd remove the pump connecting rod from the pump lever (C).

Fig. l8l 5. Removing the accelerating pump Pull out the aaelerating pump piston assembly i

3. Removing the air horn a. Remove the pump return spring. b. Remove the five screws, and remove the air horn from the body, together with the float and needle valve"

Fig. 187 $6. Specificatiom 7. ldle speed adiustments For idle sped adjustments, a tachometer should be used. Adjustments are made by using the Model 21AO28 - 061 Construction Stronberg type throttle adjust screw (A) and idle adjust screw (B). Draft direction Downward draft Outlet diameter 1.O24 in. (28 mn$) Venturi 0.732 x 0.256 in0 (18.6 x 7 mmOl Ma n let #77 Ma n air bleed #50 Slow iet #11 Pr 124 Slow air bleed Pz 17O Power jet #45 Pump injector 0.0236 in@ (0.6 mmO) Needle valve 0.059 inO (1.5 mmo) Float level 0.61m.mg in. (15.5t1 mm) Throttle valve 10o, 0.059 in. (1 .5 mm) tn ict

1 | Carbilretor clogpd. Disassemble and clean carburetor. 2 | Fuel pipe clogged. Clean pipe. 3 | Fuel system oDntains air. Check joints and retighten. 4 | Fuel pump in poor condition. Correct or replace pump. 5 | Fuel filter clogged. Replace fuel filter.

1 | Cooling water insufficient. Add water 2 I V-belt loose or slipery. Adjust or replace belt. 3 I broken. V-belt worn or broken. I Replace V-b€lt. q I Thermostat inoperative. I nepuce thermostat. 5 |I inoperative. Water pump inoperative. I Disasemble and correct pump. 0| Radiator clogged or leaky. I Ctean and correct or replace radiator. 7 | lgnition timing incorrect. Adjust timing.

C.arburetor accelsation pump circuit clogged. D isassemble carburetor and correct. Disassemble carburetor and correct.

1| incorrectly. Valve seized up or adjusted I Readjust or replace. 2 | insufficient. Compression insufficient. I Disassemble engine and adjust. 3 | Cylinder head gpsketleaky. I Replace gasket. SATOH TRACTOR

Clutch disc material Wire-reinforced woven fabric Disc dimensions 7 .26 x 5.00 x 0.3 in. (outer diameter x inner diameter x depth) (184.2 x 127 x 7.5 mm) Static transrn ission torque 100.9 ft-lb. (1 5.0 kg-m) Release bering Non-l ubrication system Operation Foot operating sYstem Pressure spring pressure (when checking) 146.67 lb" 67.5 kg) Pressure spring length (when checking) 1.583 in. 40.6 mm) Pressure spring total pressure 826.50 lb. 375 kg) Number of pressure springs 6 Pressure spring collar Light blue JAPAN paint n7 Release lever maximum operating length 0.39 in. (10 mm) Release lever height 1.81 in. (46 mm) Reamer bolt reamer diameter and number 0.35 in. t9 mml,2 SATOH TRACTOR

The transmission on the S-650G is a six forward, and the hydraulic dwice is mounted on the differ- two reverse and two P T.O. gear type transmision. ential gear and the P.T.O. transmission. The transmission case is divided into three partsi the Wellchosen casting wrought by a machine for its power transmission in the front the differential gear exclusive use is used for the €se, thus offering and the d ifferentia I lock in the center, and the enough strength and accuracy. PT.O transmission in the rear. The transmission has enough strength and accuracy Ahead the case there is a clutch housing where so that the power may be surely transmitted andI power from the engine is transmitted to the trans- that smooth transmission may be operated. > mission counter shaft by means of the spline of the The gears, axles and bearings have also sufficient main shaft. accuracy to ensure quiet operation. The axle gear cases are provided at both sides, and Various kinds of bearings are used according to the the upper cover in which the main transmission load, featuring high strength andr long durability. lever is installed is f itted to the power transmision,

1 . Remove the drain plugs under the hydraulic case, lf it is necessary to disasemble the transmission due the transmission case, and the axle gear case, and to a trouble inside, some methods of disasembly drain out the oil in each component (Fig. 4). are provided accord ing to its condition of the Note: lt is advisable to drain out oil when the trouble, however, the complete disassembly is oil temperature is high after running the engine. discussed here.

2 Remove the battery cord from each terminal and 1 3 . Unscrew the screws (M 1 0 ) and remove the lift off the battery case. hydraulic case assembly and the upper cover

7 . Remove the hydraulic control lever knob, uo- Fig. 6 Removing Circlip screw four (M12) and four (M8) scrsrus. IG "

11 Place a screw iack or a hydraulic jack under the transmission case (do not iack up the tractor). Place a garage iack under the clutch housing (in this case the tractor should not be lifted ) , un- screw ten clutch housing and transmission case Fig. 7 Pulling On*way Clueh Slratt securing bolts (M 1 2), and gently separate the engine from the transmission. b. Straighten the stopper washers and unscrew six Replace the iack under the transmission case bearing holder securing scra^rs tM 1 0) and remove with a rigid rack. the bearing holders at both srdes. Note: lf the removal is difficult, use a tap. 12 Clean the transmission so that dust may not get c. The complete differential grear unrt can be taken into the transmission during disasembly. out by gently tapping it wrth a too I such as a TRANSMISSION SYSTEM

2. Construction 2 2-1 . Height Contro I System 2 2-2. Neutral Position 2 2-3. Lifting Position 3 24. Lowering Position 4 2-5. F loating Position 5 2-6. Control Lever and Link System 5 3. Disassembling Order 6 3-1. Hydraulic System - Removal and Disassembly 6 3-2. Control Valve - Removal and Disasembly 8 3-3. Lock Valve - Disassembly 11

4. Assembling (Adiustingl Order 12 4-1 . Lock Valve Assembly 12 4-2. Control Valve (Whole Pan) - Asembly 12 4-3. Hydraulic System - Assembly . . 13 44. Adjustrnents 14 5. Oil Pump 15 5-1 . Oil Pump - Construction 15 *2" Oil Pump Disasembling Order 16 5-3. Oil Pump - Disassembly 16 il. Checking During Disasembling 17 $5. Oil Pump Asembly Order 18 56. Oil Pump - lnstallation and Trial Run 19 6. Sub-Control Valve - Description 19 6-1 . lnsullation 19 6-2. Neutral Position 20 6-3. Lifting Position 21

Th is hydrau lic mechan ism is developed by SATO H, is constantly delivered. and eguipped with a height control (position con" The oil pressure is regulated by the control lever. trol), flow control and lift control. The hydraulic When the control lever is moved, the spool valye pump is of the gear type (Kayaba-Dowty, GPl ), and operates, and then the spool valve causes the unload driven directly by the engine crankshaft main valve to move, threby moving the ram piston pulley. Accordingly, while the engine runs, the oil located in the ram cylinder.

A Ram Arm B Plug c Hydraulic Lift Case Cover D Suction Pipe E Con necting R od F Breather Ass"y G Adi ust ing Lever o H Oil Pres$rre Gauge Adaptor I Delivery P ipe J Crankshaft Pu lley K Joint (A & B), Pump L Pump Bracket M Pump N Join t o Contro I A rm P Feed Back Link o Control Valve Ass"y R Larer Stopper S Quadrant T Contro I Larer U Cover V Arm Boss

Most conventional Wpe small-size tractors employ the standard control system (ON-OFF system) which is capable of @ntrolling lifting, neutral and lowering, and, as a result, it is difficult to precisely regulate the height of the implement. The height is usually set by the depth wheel on the implement side. (SATOH"s 5-350 and 5-500 tractors employ such system.) The S-650G adopts the position control system, instead of the standard control system. The position contro I system is a lso called "the height control system". ln this manual, the latter is used. Fig. 2 Sandard Control System

The oil, which is delivered from the pump, flovlc the chck valve (4) , spool (6) and slesre (7]r, and in the direction of the arrow to push up the therefore, hc no connection with the implement unload valve (21 , and then flovra to the tank port side. (3). Pushing up the unload valve requires a very Note: The unload valve is pushed to open for the small amount of pressure, and, as a result, the following reason. That is, the passage between the pump is almost under no-load. spool (6) and the unload valve port fi4) is open, The ram cylinder oil passage is shut from the and therefore, the presure from the pump is passage on the tank and pump side by the lap of highr, thus forcing the unload valve l2l to open.

When the control valve (8) is movbd to the lifting arrow (indicated by dotted line). When the link position, the link (9) tums around the pin (10) in (9) is moved by the return spring (19) around the the direction of the arow (indicaed by full line) , pin (20) in the direction of the arrow (indicated and pushes the spool (6) to shut the unload valve by dotted linel , the spool is forced out. When the passage (14). This causes the pump oil passage to spool moves in proportion to the amount of the open to tre unload valve"s rear chamber (1 1 l, rnovement of the control lever, the implement also thereby al