John Deere Scotts S2048, S2348, S2554 Yard & Garden Tractor Service Technical Manual TM1777 Download
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John Deere Scotts S2048, S2348, S2554 Yard & Garden Tractor Service Technical Manual TM1777 Download
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John Deere Scotts S2048, S2348, S2554 Yard & Garden Tractor Service Technical Manual TM1777 Download
This technical manual is written for an experienced technician and contains sections that are specifically for this product. It is a part of a total product support program. The manual is organized so that all the information on a particular system is kept together. The order of grouping is as follows:
• Table of Contents
• Specifications
• Component Location
• System Schematic
• Theory of Operation
• Troubleshooting Chart
• Diagnostics
• Tests & Adjustments
• Repair Note:
Depending on the particular section or system being covered, not all of the above groups may be used. Each section will be identified with a symbol rather than a number. The groups and pages within a section will be consecutively numbered. We appreciate your input on this manual. If you find any errors, or want to comment on the layout of the manual, please mail your comments back to us.
TABLE OF CONTENTS:
John Deere Scotts S2048, S2348, S2554 Yard & Garden Tractor Service Technical Manual TM1777 Download
TM1777 - Scotts Yard and Garden Tractors.................................. 1 Introduction.......................................................... 2 Section 1 - SAFETY.................................................... 3 Section 2 - SPECIFICATIONS & INFORMATION.............................. 8 SPECIFICATIONS.................................................... 10 INCH TORQUE VALUES................................................ 13 LUBRICANT SPECIFICATIONS.......................................... 15 ENGINE OIL.................................................... 15 ENGINE BREAK–IN OIL........................................... 15 HYDROSTATIC TRANSMISSION OIL.................................. 16 GREASE........................................................ 16 ALTERNATIVE LUBRICANTS........................................ 16 SYNTHETIC LUBRICANTS.......................................... 17 OIL FILTERS................................................... 17 LUBRICANT STORAGE............................................. 17 SERIAL NUMBER LOCATIONS........................................... 17 TRACTOR IDENTIFICATION NUMBER................................. 17 ENGINE SERIAL NUMBER.......................................... 17 HYDROSTATIC TRANSMISSION SERIAL NUMBER........................ 17 Section 3 - KOHLER ENGINE............................................. 18 SPECIFICATIONS.................................................... 20 GENERAL SPECIFICATIONS........................................ 20 TEST & ADJUSTMENT SPECIFICATIONS.............................. 21 REPAIR SPECIFICATIONS......................................... 21 TORQUE SPECIFICATIONS......................................... 24 THEORY OF OPERATION............................................... 25 GENERAL....................................................... 25 COOLING SYSTEM................................................ 25 CRANKCASE BREATHER SYSTEM..................................... 25 LUBRICATION SYSTEM............................................ 25 FUEL SYSTEM................................................... 25 CARBURETOR.................................................... 25 AIR INTAKE SYSTEM OPERATION................................... 25 GOVERNOR OPERATION............................................ 25 IGNITION...................................................... 26 ENGINE TROUBLESHOOTING CHART...................................... 27 CARBURETOR TROUBLESHOOTING CHART.............................. 28 ENGINE TROUBLESHOOTING GUIDE...................................... 29 ENGINE HARD TO START.......................................... 29 ENGINE MALFUNCTIONS AT LOW SPEED.............................. 30 ENGINE RUNS ERRATICALLY....................................... 31 OIL CONSUMPTION IS EXCESSIVE.................................. 31 ENGINE HAS LOW POWER.......................................... 32 FUEL CONSUMPTION IS EXCESSIVE................................. 32 IGNITION SYSTEM............................................... 32 TESTS AND ADJUSTMENTS............................................. 33 GOVERNOR ADJUSTMENT........................................... 33 CHOKE ADJUSTMENT.............................................. 34 FAST IDLE SPEED ADJUSTMENT.................................... 35 SLOW IDLE SPEED ADJUSTMENT.................................... 36 CYLINDER COMPRESSION PRESSURE TEST............................ 36 FUEL SHUTOFF SOLENOID TEST.................................... 38 CRANKCASE VACUUM TEST......................................... 38 ENGINE OIL PRESSURE TEST...................................... 40 FUEL PUMP TEST................................................ 41 SPARK TEST.................................................... 41 SPARK PLUG GAP ADJUSTMENT..................................... 42 IGNITION MODULE AIR GAP ADJUSTMENT............................ 43 FLYWHEEL MAGNETS TESTS........................................ 43 SPARK ADVANCE MODULE (SAM) TEST (25 HP)....................... 44 REPAIR............................................................ 45 ENGINE REMOVAL................................................ 45 ENGINE INSTALLATION........................................... 46 AIR CLEANER REMOVAL........................................... 47 FUEL PUMP, REMOVAL AND INSTALLATION........................... 48 CARBURETOR REMOVAL AND INSTALLATION........................... 48 ROCKER ARMS REMOVAL AND INSTALLATION.......................... 49 HYDRAULIC VALVE LIFTERS INSPECTION............................ 50 STARTING MOTOR REMOVAL AND INSTALLATION....................... 51 STARTING MOTOR REMOVAL AND INSTALLATION (CV25S)............... 51 CYLINDER HEAD REMOVAL AND INSTALLATION........................ 52 VALVES AND SPRINGS REMOVAL AND INSTALLATION................... 54 VALVE SPRING INSPECTION....................................... 55 VALVE INSPECTION.............................................. 55 VALVE GUIDES INSPECTION....................................... 56 CYLINDER HEAD INSPECTION...................................... 56 RECONDITION VALVE SEATS....................................... 56 LAP VALVES.................................................... 57 PUSH ROD INSPECTION........................................... 57 CRANKCASE REED VALVE INSPECTION............................... 57 FLYWHEEL REMOVAL AND INSTALLATION............................. 58 STATOR REMOVAL AND INSTALLATION............................... 59 CAMSHAFT REMOVAL AND INSTALLATION............................. 59 CAMSHAFT INSPECTION........................................... 60 CAMSHAFT END PLAY............................................. 61 GOVERNOR REMOVAL AND INSTALLATION............................. 61 GOVERNOR CONTROL ARM REMOVAL AND INSTALLATION................. 62 PISTON REMOVAL................................................ 62 PISTON DISASSEMBLE............................................ 63 PISTON PIN INSPECTION......................................... 63 PISTON INSPECTION............................................. 63 PISTON RING END GAP........................................... 64 PISTON RING SIDE CLEARANCE.................................... 64 PISTON TO BORE MEASUREMENT.................................... 64 CRANKSHAFT MEASUREMENT........................................ 65 PISTON ASSEMBLY............................................... 66 PISTON INSTALLATION........................................... 67 OIL PAN REMOVAL AND INSTALLATION.............................. 68 OIL PAN CRANKSHAFT SEAL REMOVAL AND INSTALLATION.............. 69 CRANKSHAFT OIL SEAL REMOVAL AND INSTALLATION.................. 69 OIL PRESSURE SWITCH, REPLACE.................................. 69 OIL PUMP REMOVAL AND INSTALLATION............................. 70 BLOCK INSPECTION.............................................. 70 CYLINDER BORE DEGLAZE......................................... 71 CONDUCTORS FOR 12 VOLT CIRCUITS............................... 76 Section 4 - ELECTRICAL................................................ 72 THEORY OF OPERATION INFORMATION................................... 74 DIAGNOSTIC INFORMATION........................................ 74 WIRE COLOR ABBREVIATION CHART................................. 74 READING ELECTRICAL SCHEMATICS................................. 75 COMMON CIRCUIT TESTS.......................................... 76 SPECIFICATIONS.................................................... 77 COMPONENT LOCATION................................................ 78 ELECTRICAL SCHEMATIC AND WIRING HARNESS LEGEND................ 79 ELECTRICAL SECTION WIRING HARNESS LEGEND...................... 79 STANDARD ELECTRICAL SCHEMATIC................................. 80 W1 MAIN WIRING HARNESS........................................ 83 W2 HEADLIGHT WIRING HARNESS................................... 86 W3 ENGINE WIRING HARNESS...................................... 86 W4 ENGINE WIRING HARNESS...................................... 86 W5 (CV20S and CV23S) ENGINE WIRING HARNESS.................... 86 W6 ENGINE WIRING HARNESS...................................... 86 W7 (CV25S) ENGINE WIRING HARNESS.............................. 87 W8 (CV25S) ENGINE WIRING HARNESS.............................. 87 TROUBLESHOOTING................................................... 88 THEORY AND DIAGNOSIS.............................................. 89 POWER CIRCUIT OPERATION....................................... 89 POWER CIRCUIT SCHEMATIC....................................... 90 POWER CIRCUIT DIAGNOSIS....................................... 91 CRANKING CIRCUIT OPERATION.................................... 95 CRANKING CIRCUIT SCHEMATIC.................................... 96 CRANKING CIRCUIT DIAGNOSIS.................................... 97 IGNITION CIRCUIT OPERATION.................................... 99 IGNITION CIRCUIT SCHEMATIC....................................100 IGNITION CIRCUIT DIAGNOSIS....................................101 ENGINE SHUTOFF CIRCUIT OPERATION..............................103 ENGINE SHUTOFF CIRCUIT SCHEMATIC..............................104 ENGINE SHUTOFF CIRCUIT DIAGNOSIS..............................105 CHARGING CIRCUIT OPERATION....................................107 CHARGING CIRCUIT SCHEMATIC....................................108 CHARGING CIRCUIT DIAGNOSIS....................................109 PTO CIRCUIT OPERATION.........................................111 PTO CIRCUIT SCHEMATIC.........................................112 PTO CIRCUIT DIAGNOSIS.........................................113 REVERSE IMPLEMENT OPTION (RIO) CIRCUIT OPERATION..............115 REVERSE IMPLEMENT OPTION (RIO) CIRCUIT SCHEMATIC..............116 REVERSE IMPLEMENT OPTION (RIO) CIRCUIT DIAGNOSIS..............117 REVERSE IMPLEMENT OPTION (RIO) CIRCUIT DIAGNOSIS..............119 HEADLIGHT CIRCUIT OPERATION...................................121 HEADLIGHT CIRCUIT SCHEMATIC...................................122 W2 HEADLIGHT WIRING HARNESS...................................122 HEADLIGHT CIRCUIT DIAGNOSIS...................................123 TESTS & ADJUSTMENTS...............................................125 GROUND CIRCUIT TESTS..........................................125 BATTERY TEST..................................................126 CHARGE BATTERY................................................126 BATTERY LOAD TEST.............................................127 STARTING SOLENOID TEST........................................128 STARTING MOTOR SOLENOID TEST (CV25S ENGINE)...................128 STARTING MOTOR LOADED AMPERAGE DRAW TEST......................129 STARTING MOTOR NO-LOAD AMPERAGE & RPM TESTS...................130 STARTING MOTOR NO-LOAD AMPERAGE & RPM TESTS...................131 SPARK TEST....................................................133 LIGHT SWITCH TEST.............................................133 KEY SWITCH TEST...............................................134 PTO/RIP SWITCH TEST...........................................134 RELAY TEST....................................................135 BRAKE or REVERSE IMPLEMENT OPTION SWITCH TEST.................135 OIL PRESSURE SWITCH TEST......................................136 SEAT SWITCH TEST..............................................137 FLYWHEEL MAGNET TEST..........................................137 STATOR OUTPUT TEST............................................138 VOLTAGE REGULATOR/RECTIFIER TEST..............................138 ARMATURE WITH COIL (CV20S and CV23S)..........................139 AIR GAP ADJUSTMENT (CV20S and CV23S)..........................139 ARMATURE TEST (CV20S and CV23S)...............................139 ARMATURE WITH COIL (CV25S)....................................140 AIR GAP ADJUSTMENT (CV25S)....................................140 ARMATURE TEST (CV25S).........................................140 REPAIR............................................................141 STARTING MOTOR REMOVAL & INSTALLATION.........................141 STARTING MOTOR DRIVE REPLACEMENT..............................142 BRUSH REPLACEMENT & ARMATURE TEST.............................142 STARTING MOTOR REMOVAL & INSTALLATION.........................144 STARTING MOTOR DISASSEMBLY & ASSEMBLY.........................145 Section 5 - POWER TRAIN—HYDROSTATIC...................................148 SPECIFICATIONS....................................................150 ADJUSTMENT SPECIFICATIONS.....................................150 REPAIR SPECIFICATIONS.........................................150 TORQUE SPECIFICATIONS.........................................150 OTHER MATERIALS...............................................151 COMPONENT LOCATION................................................152 THEORY OF OPERATION...............................................159 DRIVE SYSTEM OPERATION........................................159 HYDROSTATIC SYSTEM OPERATION..................................161 GEAR POWER FLOW...............................................163 TRANSAXLE BRAKE...............................................164 TROUBLESHOOTING...................................................165 DIAGNOSIS.........................................................167 TRACTOR WILL NOT MOVE FORWARD OR REVERSE......................167 NOISY OPERATION...............................................171 TRACTOR CREEPS................................................173 TRACTOR MOVES IN ONE DIRECTION ONLY...........................175 ERRATIC SPEED.................................................177 TRACTOR DOES NOT ACHIEVE FULL GROUND SPEED....................179 PARK BRAKE DOES NOT HOLD TRACTOR ON HILL......................183 TRACTOR IS TOO AGGRESSIVE IN FORWARD OR REVERSE...............185 FREEWHEEL VALVE WILL NOT WORK.................................186 ADJUSTMENTS.......................................................187 HYDROSTATIC TRANSAXLE BLEEDING PROCEDURE......................187 NEUTRAL CREEP ADJUSTMENT......................................187 PEDAL HEIGHT ADJUSTMENT.......................................188 BRAKE LINKAGE ADJUSTMENT......................................189 TRACTION DRIVE BELT TENSION ADJUSTMENT........................189 REPAIR............................................................191 TRANSAXLE REMOVAL AND INSTALLATION............................191 TRANSAXLE DISASSEMBLY.........................................197 TRANSAXLE ASSEMBLY............................................206 TRACTION DRIVE BELT REMOVAL AND INSTALLATION..................215 DRIVE BELT TENSIONER ASSEMBLY.................................216 Section 6 - STEERING..................................................218 SPECIFICATIONS....................................................220 THEORY OF OPERATION...............................................221 STEERING SYSTEM...............................................221 TROUBLESHOOTING...................................................222 STEERING SYSTEM TROUBLESHOOTING CHART.........................222 STEERING SYSTEM DIAGNOSIS.....................................223 DRAG LINK ADJUSTMENT..........................................224 REPAIR............................................................224 STEERING WHEEL REMOVAL AND INSTALLATION.......................224 STEERING SHAFT................................................224 STEERING SECTOR REMOVAL & INSTALLATION........................226 LEFT TURN STOP MODIFICATION...................................227 Section 7 - BRAKES....................................................228 SPECIFICATIONS....................................................230 ADJUSTMENT SPECIFICATIONS.....................................230 REPAIR SPECIFICATIONS.........................................230 OTHER MATERIALS...............................................230 COMPONENT LOCATION AND OPERATION..................................231 BRAKE SYSTEM OPERATION........................................231 HYDROSTATIC INTERNAL BRAKE LINKAGE OPERATION..................232 TROUBLESHOOTING...................................................233 DIAGNOSIS.........................................................234 BRAKES DO NOT ENGAGE WHEN PEDAL DEPRESSED.....................234 PARK BRAKE DOES NOT HOLD MACHINE ON HILL......................234 NOISY OPERATION...............................................235 MACHINE WILL NOT MOVE, OR IS SLOW IN FORWARD..................235 MACHINE WILL NOT MOVE, OR IS SLOW REVERSE.....................236 BRAKE SWITCH DOES NOT ENGAGE WHEN BRAKE PEDAL IS DEPRESSED....236 ADJUSTMENTS.......................................................237 BRAKE ADJUSTMENT..............................................237 REPAIR............................................................237 BRAKE LINKAGE.................................................237 BRAKE PEDAL ASSEMBLY..........................................237 BRAKE REMOVAL AND INSTALLATION................................238 PARK BRAKE LEVER AND LINKAGE................................239 Section 8 - ATTACHMENTS...............................................242 SPECIFICATIONS....................................................242 ADJUSTMENT SPECIFICATIONS.....................................242 REPAIR SPECIFICATIONS.........................................242 SPECIAL OR ESSENTIAL TOOLS....................................242 SERVICE PARTS KITS............................................242 COMPONENT LOCATION................................................243 MOWER DECK COMPONENTS 48/54 INCH..............................243 DRAFT ARMS COMPONENT LOCATION.................................244 GAUGE WHEELS COMPONENT LOCATION...............................244 IDLERS AND SHEAVES 48/54 INCH.................................245 TROUBLESHOOTING...................................................246 MOWER DECK TROUBLESHOOTING CHART..............................246 DIAGNOSIS.........................................................246 MOWER DRIVE CHECKS............................................247 MOWER DECK WILL NOT RUN.......................................249 MOWER DECK VIBRATES...........................................250 CUTS UNEVENLY.................................................251 ADJUSTMENTS.......................................................252 MOWER LEVEL SIDE-TO-SIDE......................................252 MOWER LEVEL FRONT-TO-REAR.....................................253 MOWER GAGE WHEELS ADJUST......................................254 REPAIR............................................................254 MOWER BLADES REMOVAL AND INSTALLATION.........................254 SHARPEN MOWER BLADES..........................................254 BALANCING MOWER BLADES........................................255 MOWER DECK REMOVAL AND INSTALLATION...........................255 SPINDLES 48/54 INCH REMOVAL AND INSTALLATION..................257 SPINDLES 48/54 INCH DISASSEMBLY AND INSPECTION................257 Section 9 - MISCELLANEOUS.............................................262 SPECIFICATIONS....................................................262 OTHER MATERIALS...............................................262 COMPONENT LOCATION................................................263 FRONT AXLE AND TIRES COMPONENT LOCATION.......................263 REPAIR............................................................265 FRONT AXLE REMOVAL AND INSTALLATION...........................265 FRONT WHEEL REMOVAL AND INSTALLATION..........................267 FRONT WHEEL BUSHING REMOVAL...................................267 HOOD REMOVAL AND INSTALLATION.................................267 SEAT AND SUPPORT REMOVAL AND INSTALLATION.....................268 FENDER DECK REMOVAL AND INSTALLATION..........................268 MOWER DECK LIFT LINKAGE.......................................269 HEIGHT ADJUSTER...............................................269 LIFT ASSIST AND DEPTH STOP OPERATION..........................264 A.........................................................270 B.........................................................270 C.........................................................270 D.........................................................271 E.........................................................271 F.........................................................272 G.........................................................272 H.........................................................272 K.........................................................272 L.........................................................273 M.........................................................273 N.........................................................273 O.........................................................273 P.........................................................273 R.........................................................273 S.........................................................274 T.........................................................274 INDEX.................................................................270 A.................................................................270 B.................................................................270 C.................................................................270 D.................................................................271 E.................................................................271 F.................................................................272 G.................................................................272 H.................................................................272 K.................................................................272 L.................................................................273 M.................................................................273 N.................................................................273 O.................................................................273 P.................................................................273 R.................................................................273 S.................................................................274 T.................................................................274
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⦁ This is the SAME manual used by the dealers to troubleshoot any faults in your vehicle. This can be yours in 2 minutes after the payment is made.
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