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POWER TRAIN
CONTENTS
Page
CONTENTS
3/20/97
5 - 1
POWER TRAIN
SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
GENERAL SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
REPAIR SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
TORQUE SPECIFICATIONS (ALPHABETICAL ORDER) . . . . . . . . . . . . . . . . . . . . . 6
ENGINE OUTPUT SHAFT LUBRICATION SPECIFICATIONS . . . . . . . . . . . . . . . . . 6
OTHER MATERIALS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
SERVICE PART KITS (ALPHABETICAL ORDER) . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
COMPONENT LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
TRANSAXLE—PEERLESS MODEL 920-017
STX30 (SN —135158) (SN 160759— )
STX38 (SN —139614) (SN 185587—210000) . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
TRANSAXLE—PEERLESS MODEL 930-004 & 930-004A
STX30 (SN —135158) (SN 160759— )
STX38 (SN —139614) (SN 185587—210000) . . . . . . . . . . . . . . . . . . . . . . . . . . 10
TRANSAXLE—PEERLESS MODEL 915-012A & 915-012B
STX30 (SN 135159—160758)
STX38 (SN 139615—185586) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
TRANSAXLE—DANA 5-SPEED
STX38 (SN 210001—301382) & STX46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
TRANSAXLE—DANA 5-SPEED
STX38 (SN 301383— ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
TRACTION DRIVE SYSTEM
STX30 & STX38 (SN —210000) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
CLUTCH AND BRAKE PEDAL
STX30 & STX38 (SN —210000) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
TRACTION DRIVE SYSTEM
STX38 (SN 210001— ) & STX46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
THEORY OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
CLUTCH PEDAL AND BELT TRACTION DRIVE
SYSTEM OPERATION STX30 & STX38 (SN —210000) . . . . . . . . . . . . . . . . . . 20
CLUTCH PEDAL AND BELT TRACTION DRIVE
SYSTEM OPERATION STX38 (SN 210001— ) & STX46 . . . . . . . . . . . . . . . . . . 21
TRANSAXLE OPERATION
PEERLESS MODELS 920-017, 930-004 & 930-004A
STX30 (SN —135158) (SN 160759— ) &
STX38 (SN —139614) (SN 185587—210000) . . . . . . . . . . . . . . . . . . . . . . . . . . 22
TRANSAXLE OPERATION
PEERLESS MODELS 915-012A/915-012B
STX30 (SN 135159—160758) &
STX38 (SN 139615—185586) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
TRANSAXLE OPERATION
STX38 (SN 210001— ) & STX46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
BRAKE SYSTEM COMPONENT LOCATION AND OPERATION . . . . . . . . . . . . . . 26
- TECHNICAL 1
- STX30, STX38, and STX46 1
- Lawn Tractors 1
- STX38 Gear Drive 2
- STX38 Hydrostatic Drive 2
- STX38 Motorsport Edition 2
- METRIC FASTENER TORQUE VALUES 14
- METRIC FASTENER TORQUE 15
- VALUE - GRADE 7 15
- INCH FASTENER TORQUE VALUES 16
- O-RING SEAL 17
- SERVICE RECOMMENDATIONS 17
- O-RING FACE SEAL FITTINGS 19
- O-RING BOSS FITTINGS 19
- GASOLINE SPECIFICATIONS 20
- GASOLINE STORAGE 20
- 4–CYCLE ENGINES - EUROPE 21
- 4–CYCLE GASOLINE ENGINE OIL 22
- NORTH AMERICA 22
- BREAK–IN 4-CYCLE GASOLINE 24
- ENGINE OIL - NORTH AMERICA 24
- ENGINE OIL - EUROPE 25
- HYDROSTATIC TRANSMISSION OIL 26
- - NORTH AMERICA 26
- - EUROPE 27
- ALTERNATIVE LUBRICANTS 28
- SYNTHETIC LUBRICANTS 28
- LUBRICANT STORAGE 28
- MIXING OF LUBRICANTS 28
- OIL FILTERS 28
- GEAR TRANSMISSION GREASE 29
- ANTI-CORROSION GREASE 30
- GREASE SPECIFICATIONS 31
- GREASE - NORTH AMERICA 31
- GREASE - EUROPE 31
- SERIAL NUMBER LOCATIONS 32
- TORQUE SPECIFICATIONS 40
- (Alphabetical Order) 40
- ESSENTIAL TOOLS 41
- SERVICE PARTS KITS 41
- MAIN COMPONENTS 46
- ENGINE HARD TO START AND/OR 48
- ENGINE STARTER KICKS OUT 48
- THROTTLE CABLE ADJUSTMENT 50
- CHOKE ADJUSTMENT 50
- GOVERNOR ADJUSTMENT 51
- FAST IDLE SPEED ADJUSTMENT 51
- SLOW IDLE SPEED ADJUSTMENT 52
- NON CARB/EPA (EARLY MODELS) 52
- ATTENTION 53
- CYLINDER COMPRESSION TEST 54
- AUTOMATIC COMPRESSION 54
- RELEASE (ACR) TEST 54
- CRANKCASE VACUUM TEST 55
- FUEL FLOW TEST 56
- OIL PRESSURE TEST 56
- FUEL AND AIR SYSTEM REPAIR 57
- REMOVE AND INSTALL FUEL TANK 58
- AND DASH PANEL ASSEMBLY 58
- REPLACE FUEL FILTER 60
- AIR INTAKE SYSTEM COMPONENTS 61
- CARBURETOR 61
- INSPECT CARBURETOR 62
- REMOVE AND INSTALL ENGINE 63
- REMOVE AND INSTALL ROCKER 64
- INSPECT PUSH ROD 64
- REMOVE AND INSTALL CYLINDER 64
- REMOVE AND INSTALL VALVES 65
- AND SPRINGS 65
- INSPECT CYLINDER HEAD 65
- INSPECT VALVES 65
- ANALYZE VALVES 66
- INSPECT VALVE GUIDES 67
- RECONDITION VALVE SEATS 67
- LAP VALVES 68
- INSPECT BREATHER 68
- REMOVE AND INSTALL FLYWHEEL 68
- REMOVE AND INSTALL CAMSHAFT 69
- INSPECT CAMSHAFT 69
- MEASURE CAMSHAFT END PLAY 70
- HYDRAULIC VALVE LIFTERS— 70
- INSPECTION 70
- BALANCER SHAFT REMOVAL & 71
- BALANCER SHAFT INSPECTION 72
- GOVERNOR REMOVAL & 72
- GOVERNOR INSPECTION 73
- REMOVE PISTON ASSEMBLY 73
- ANALYZE PISTON RING WEAR 74
- ANALYZE PISTON WEAR 74
- PISTON ASSEMBLY 77
- MEASUREMENT 77
- INSTALL PISTON ASSEMBLY 78
- INSTALL CONNECTING ROD 79
- CRANKSHAFT REMOVAL & 79
- CRANKSHAFT ALIGNMENT 80
- REMOVE AND INSTALL OIL PAN 80
- CRANKCASE OIL SEAL 81
- INSPECT OIL PICKUP 82
- OIL PUMP RELIEF VALVE 82
- INSPECT ION 82
- OIL PUMP INSTALLATION 82
- CYLINDER BLOCK REMOVE & 83
- INSTALL 83
- CYLINDER BLOCK INSPECT 83
- CYLINDER BORE DEGLAZING 83
- REBORE CYLINDER BLOCK 84
- READING ELECTRICAL 89
- SCHEMATICS 89
- COMMON CIRCUIT TESTS 90
- STX38 (SN 210001— ) 100
- STX46 (SN 240001— ) 100
- WIRING HARNESS DIAGRAMS 101
- WIRING SCHEMATICS 102
- STX30 (SN 135160—160000) 104
- STX38 (SN 139616—160000) 104
- STX38 (SN 160001—210000) 106
- CIRCUIT OPERATION AND 110
- DIAGNOSIS 110
- CRANKING CIRCUIT OPERATION 110
- ELECTRICAL 111
- CRANKING CIRCUIT DIAGNOSIS 112
- IGNITION CIRCUIT OPERATION 118
- CHARGING CIRCUIT OPERATION 128
- PTO CIRCUIT OPERATION 136
- PTO CIRCUIT DIAGNOSIS POINTS 138
- PTO AND HEADLIGHTS CIRCUITS 140
- OPERATION 140
- TESTS AND ADJUSTMENTS 146
- GROUND CIRCUIT TESTS 146
- BATTERY TEST 147
- CHARGE BATTERY 147
- BATTERY LOAD TEST 148
- REGULATED VOLTAGE OUTPUT 149
- UNREGULATED VOLTAGE OUTPUT 149
- STARTER SOLENOID TEST 150
- STARTER AMP DRAW TEST 150
- IGNITION SPARK TEST 151
- IGNITION MODULE AIR GAP 151
- ADJUSTMENT 151
- IGNITION MODULE TEST 152
- SEAT SWITCH TEST 152
- BRAKE PEDAL/PARK BRAKE 153
- SWITCH TESTS 153
- BRAKE SWITCH ADJUSTMENT 153
- HEADLIGHT SWITCH TEST 154
- (OPTIONAL) 154
- KEY SWITCH TESTS 154
- PTO SWITCH TESTS 155
- PTO CLUTCH TEST 155
- PTO CLUTCH AIR GAP 156
- FLYWHEEL MAGNETS 156
- TRANSMISSION NEUTRAL SWITCH 157
- REMOVE AND INSTALL KEY 158
- SWITCH AND PTO SWITCH 158
- REMOVE AND INSTALL SEAT 158
- REMOVE AND INSTALL STARTER 159
- SOLENOID 159
- REMOVE AND INSTALL STATOR 159
- AND IGNITION MODULE 159
- REPAIR PTO CLUTCH 160
- REPLACE BENDIX DRIVE 161
- REPAIR STARTER AND REPLACE 161
- REPAIR STARTER ARMATURE 162
- REMOVE AND INSTALL 163
- CONTENTS 165
- SPECIFICATIONS 167
- GENERAL SPECIFICATIONS 167
- REPAIR SPECIFICATIONS 169
- OTHER MATERIALS 171
- COMPONENT LOCATION 173
- STX30 (SN 135159—160758) 175
- STX38 (SN 139615—185586) 175
- TRANSAXLE—DANA 5-SPEED 176
- STX38 (SN 210001—301382) 176
- STX38 (SN 301383— ) 178
- TRACTION DRIVE SYSTEM 182
- THEORY OF OPERATION 184
- CLUTCH PEDAL AND BELT 184
- OPERATION STX30 & STX38 184
- (SN —210000) 184
- TRANSAXLE OPERATION 187
- PEERLESS MODELS 187
- 915-012A/915-012B 187
- BRAKE SYSTEM COMPONENT 190
- LOCATION AND OPERATION 190
- TROUBLESHOOTING 192
- CLUTCH/BRAKE PEDAL LINKAGE 198
- AND TRACTION DRIVE SYSTEM 198
- BRAKE SPRING ADJUSTMENT 198
- BRAKE PAD ADJUSTMENT 199
- CLUTCH SPRING ADJUSTMENT 200
- SHIFT LINKAGE ADJUSTMENT 201
- BRAKES STX30 & STX38 202
- (SN —210000) REMOVAL/ 202
- INSTALLATION 202
- TRACTION DRIVE BELT REMOVAL/ 203
- INSPECTION/INSTALLATION— 203
- TRANSAXLE CASE—DISASSEMBLY 213
- TRANSAXLE CASE—ASSEMBLY 216
- STX38 & STX46 LATE MODEL 217
- REMOVAL/INSPECTION/ 219
- INSTALLATION— 219
- TRANSAXLE—REMOVAL/ 221
- TRANSAXLE—DISASSEMBLY 221
- TRANSAXLE ASSEMBLY— 228
- BRAKES—ASSEMBLY 232
- HYDROSTATIC POWER TRAIN 234
- HYDROSTATIC TRANSAXLE 239
- BELT TRACTION DRIVE SYSTEM 242
- TRANSAXLE AND SHIFT LINKAGE 242
- SYSTEM OPERATION 242
- BRAKE/NEUTRAL RETURN 244
- SYSTEM COMPONENT LOCATION 244
- AND OPERATION 244
- TRANSPORT (FREE-WHEEL) 247
- DIAGNOSIS CONTINUED 252
- DRIVE BELT ADJUSTMENT 255
- TRANSPORT (FREE-WHEEL) VALVE 255
- BELLCRANK SPRING TENSION 256
- REPEAT TEST DRIVE 258
- INSPECTION/INSTALLATION 259
- TRACTION DRIVE BELT 260
- TENSIONING SYSTEM REMOVAL/ 260
- POWER TRAIN LINKAGE SYSTEM 261
- TRANSAXLE REMOVAL AND 262
- TRANSAXLE DISASSEMBLY 263
- DIFFERENTIAL AXLE— 268
- DISASSEMBLY 268
- PUMP, MOTOR, AND CENTER 270
- BLOCK—DISASSEMBLY 270
- TRANSAXLE ASSEMBLY 273
- TRANSAXLE CASE HALVES— 278
- ASSEMBLY 278
- BRAKE ASSEMBLY— 278
- RESERVOIR COVER AND 279
- BREATHER VALVE—ASSEMBLY 279
- FAN AND DRIVE SHEAVE— 279
- TRANSAXLE BLEED PROCEDURE 280
- STEERING 282
- SERVICE EQUIPMENT AND TOOLS 283
- STEERING BACKLASH 284
- STEERING GEAR ASSEMBLY— 285
- REMOVAL 285
- PEDESTAL BUSHINGS— 286
- REPLACEMENT 286
- SERVICE EQUIPMENT & TOOLS 289
- OTHER MATERIAL 289
- FRONT WHEELS— 291
- TOE-IN & CAMBER 291
- FRONT AXLE 292
- REMOVAL & INSTALLATION 292
- MOWER DECKS 293
- LIFT SYSTEM 293
- STX38 (M00STXB595001—750000) 293
- STX38 (M00STXB010001—139615) 293
- STX38 (M00STXB139616—210000) 294
- LIFT LINKAGE REPAIR— 295
- STX30 & 295
- STX38 (SN —210000) 295
- STX38 (SN 210001— ) & 296
- 30-INCH MOWER DECK 297
- SPINDLES— 303
- STX38 (SN 210001— ) & 303
- STX46 (SN 240001— ) 303
- MOWER BLADE ADJUSTMENT 305
- MOWER DECK BLOWOUT—STX46 307
- MOUNTING PLATE 308
- MOWER FRAME 308
- INDEX - 6 314
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