John Deere SST15, SST16, SST18 Spin-Steer Lawn Tractor Technical Manual TM1908 01JUL04

Numerics
42AP Mower Deck
Belt Tensioner Assembly Remove and Install 307
Blades Removal and Installation 309
Mower Drive Belt Remove and Install 307
Specifications 275
Spindles Removal and Installation 308
Wheels Adjusting 284
42M Mower Deck
Belt Tensioner Assembly Remove and Install 303
Blade Timing 289
Blades Removal and Installation 306
Mower Deck Wheels Adjusting 285
Secondary Drive Belt Remove and Install 299
Specifications 275
Spindles Removal and Installation 304
Timing Belt Remove and Install 299
Timing Belt Tensioning 289
48C Mower Deck
Belt Tensioner Assembly Remove and Install 310
Blades Removal and Installation 312
Lift Assist Spring Adjustment 284
Mower Drive Belt Remove and Install 310
Specifications 275
Spindles Removal and Installation 311
Wheels Adjusting 285
A
Adjustments, Identify Necessary Steering 249
Attachments Specifications 275
Avoid Harmful Asbestos Dust 3
Avoid Injury
Rotating Blades, Augers And PTO Shafts 2
Axle, Front
Removal and Installation 318
B
Balancing Blades 299
Be Prepared For Emergencies 1
Belts
Traction Drive Operation 199
Traction Drive Removal and Installation 211
Blades
Balancing 299
Blade Timing – 42M 289
Sharpening 298
Bleeding Transaxle 210
Brakes
Adjustment 268
Lever and Linkage 271
Park Brake Lever and Linkage 271
Park Brake Test 268
Pedal Assembly Removal and Installation 269
Specifications 265
System Components 266
Theory of Operation 267
Break-in engine oil
4-cycle gasoline .10
Briggs & Stratton Engine
Air Cleaner Removal and Installation .33
Blower Housing Removal and Installation .33
Blower Housing Removal/Installation .34
Breather Valve Service .59
Carburetor
Adjustment .28
Assembly .39
Disassembly .36
Inspection .38
Removal and Installation .35
Choke Cable Adjustment .26
Compression Test .30
Connecting Rod & Camshaft Specifications .16
Connecting Rod Inspection .50
Crankshaft Removal and Installation .55
Cylinder Air Guides Removal/Installation .41
Cylinder Bore
Cleaning .53
Honing .52
Inspection .52
Resizing .53
Cylinder Bore & Piston Specifications .16
Cylinder Head Inspection and Repair .46
Cylinder Head Removal and Installation .44
Flywheel Removal and Installation .54
Fuel Shutoff Solenoid Test .29
Governor Adjustment .27
Ignition Armature Air Gap Adjustment .32
Intake Manifold Removal/Installation .44
Magneto Bearing Inspection .57
Oil Pressure Test .31
Oil Pump Removal .60
PTO Clutch Removal .42
PTO and Cam Bearing Inspection .58
Piston Inspection .50
Piston, Rings, & Rod Removal and Installation .48
Removal and Installation .42
Repair .33
Repair Specifications .16
Specifications .15
Starting Motor
Assembly .64
Disassembly .62
Pinion Gear Replacement .65
Removal and Installation .61
Tests and Adjustments .26
Tests and Adjustments Specifications .15
Throttle Cable Adjustment .26
Torque Specifications .18
Valve Guide Ream .48
Valve Inspection and Repair .47
Valve Removal .47
Valves
Clearance Adjustment 29
Installation 48
Valves Specifications 16
C
California Proposition 65 Warning 3
Carburetor
Briggs & Stratton Engine
Adjustment 28
Assembly 39
Disassembly 36
Inspection 38
Removal and Installation 35
Case Seal Replacement, Transaxle 229
Common Circuit Tests 115
Component Location
42 AP Mower Deck 278
42M Mower Deck 277
48C Mower Deck 279
Brakes 266
Electrical 117
Forward/Reverse Linkage 196
Mower Lift Linkage 276
Propel Pump, Motor, and Gears 195
Steering Pump and Motor 197
Steering System 240
Transaxle 194
Creep, Steering Adjustment 246
Cutting Height Adjusting 283
D
Deck Removal and Installation 293
Diagnostics
Briggs & Stratton Engine 19
Mower Deck 280
Blades Will Not Rotate 280
Drive Belt Slips 280
Drive Belt Will Not Stay On Pulleys 281
Uneven Cutting Or Striping 282
Vibration 281
Steering 245
Transaxle 205
Dispose of Waste Properly 4
Drive Train Specifications 193
E
Electric PTO Clutch Removal
Briggs & Stratton Engine 42
Electrical
Charging Circuit Diagnosis – SST15 159
Charging Circuit Diagnosis – SST16 and SST18 161
Charging Circuit Electrical Schematic 158
Charging Circuit Operation 157
Common Circuit Tests 115
Component Location 117
Conductors for 12 Volt Circuits .115
Cranking Circuit Diagnosis .140
Cranking Circuit Electrical Schematic .139
Cranking Circuit Operation .138
Diagnostic Information .113
Diode Test .186
Forward/Reverse Circuit Diagnosis .165
Forward/Reverse Circuit Electrical Schematic .164
Forward/Reverse Circuit Operation .163
General Information .113
Headlight Circuit Diagnosis .173
Headlight Circuit Electrical Schematic .172
Headlight Circuit Operation .172
Ignition Circuit Diagnosis .145
Ignition Circuit Electrical Schematic – SST15 .143
Ignition Circuit Operation .142
Ignition Circuit Schematic – SST16 and SST18 .144
Instrument Panel Circuit Diagnosis – SST18 .176
Instrument Panel Circuit Operation – SST18 .174
Instrument Panel Circuit Schematic – SST18 .175
Main Schematic – SST15 .119
Main Schematic – SST16 and SST18 .121
Main Wiring Harness – SST15 .123
Main Wiring Harness – SST16 and SST18 .126
N1 Voltage Regulator/Rectifier .130
PTO Circuit Diagnosis .168
PTO Circuit Electrical Schematic .167
PTO Circuit Operation .167
PTO with RIO Circuit Diagnosis .171
PTO with RIO Circuit Electrical Schematic .170
PTO with RIO Circuit Operation .169
Power Circuit Diagnosis .135
Power Circuit Electrical Schematic – SST15 .132
Power Circuit Operation – SST15 .131
Power Circuit Operation – SST16 and SST18 .133
Power Circuit Schematic – SST16 and SST18 .134
Reading Electrical Schematics .114
Schematic and Wiring Harness Legend .118
Shunt Circuit Operation – SST15 .138
Shutoff Circuit Diagnosis .153
Shutoff Circuit Electrical Schematic – SST15 .148
Shutoff Circuit Operation .147
Shutoff Circuit Schematic – SST16 and SST18 .148
Specifications .116
Starting Motor
Briggs & Stratton Engine
Assembly .64
Disassembly .62
Pinion Gear Replacement .65
Removal and Installation .61
Kohler Engine
Assembly .108
Removal and Installation .108
Theory of Operation Information .113
Vacuum Solenoid Test .190
W1 Main Wiring Harness
Wire Color Codes – SST15 125
Wire Color Codes – SST16 & SST18 128
W2 Instrument Wiring Harness
Wire Color Codes – SST18 129
W2 Instrument Wiring Harness – SST18 129
W4 Headlight Wiring Harness 130
Wire Color Abbreviation Chart 113
Y1 PTO Clutch 129
Y2 Fuel Shutoff Solenoid 130
Engine
Oil Specifications 9
F
Fender Deck, Removal and Installation 317
Fender, Front Removal and Installation 318
Filters, Replacing Steering 257
Forward/Reverse Linkage
Component Location 196
Front Steering Rod Adjustment
Early Models 251
Later Models 253
Front Wheel Bearing Repair 318
Front Wheel Removal and Installation 318
Fuel/Oil Tank Removal and Installation 319
G
Gasoline specifications
4-cycle engines 9
Gasoline storage 9
General Information
Electrical 113
H
Handle Chemical Products Safely 4
Handling And Servicing Batteries 1
Height, Adjusting Cutting 283
Hood, Removal and Installation 316
I
Idlers Disassembly and Assembly 298
Ignition Air Gap Adjustment
Briggs & Stratton Engine 32
Illuminate Work Area Safely 2
Inch Fastener Torque Values 8
J
Jack Sheave Disassembly and Assembly 298
K
Kohler Engine
Air Intake System Components 84
Automatic Compression Release (ACR) 82
Balancer Shaft
Inspection 96
Removal/Installation 96
Repair Specifications 71
Breather Inspection .89
Camshaft
End Play Measurement .93
Inspection .94
Removal/Installation .93
Repair Specifications .71
Carburetor Inspection .85
Carburetor Removal/Installation .84
Choke Adjustment .77
Connecting Rod Measurement .100
Connecting Rod Repair Specifications .72
Crankcase Oil Seal Removal/Installation .105
Crankcase Vacuum Test .80
Crankshaft
Alignment .102
Removal/Installation .102
Repair Specifications .70
Crankshaft & Main Bearing Inspection .102
Cylinder Block Inspection .106
Cylinder Bore Deglazing .106
Cylinder Bore, Piston & Rings
Repair Specifications .71
Cylinder Head Assembly
Repair Specifications .70
Cylinder Head Inspection .90
Cylinder Head Removal/Installation .89
Cylinder Leakdown Test .79
Engine Removal/Installation .86
Fast Idle Speed Adjustment .78
Flywheel Removal/Installation .92
Fuel Flow Test .82
Fuel Pump Remove & Install .86
Governor
Inspection .97
Removal/Installation .97
Repair Specifications .72
Governor Adjustment .78
Hydraulic Valve Lifters Inspection .95
Hydraulic Valve Lifters Removal/Installation .95
Oil Pan Removal/Installation .103
Oil Pan Seal Removal/Installation .105
Oil Pickup Inspection .105
Oil Pressure Test .83
Oil Pump Installation .103
Oil Pump Relief Valve Inspection .104
Piston Assembly
Disassemble .98
Inspection .98
Measurement .100
Removal .98
Piston Installation .101
Piston Measurement .99
Piston Ring
End Gap Measurement .99
Side Clearance Measurement .99
Repair .84
Repair Specifications 70
Rocker Arms Removal/Installation 88
Rocker Arms Repair Specifications 70
Rocker Shaft Repair Specifications 70
Slow Idle Speed Adjustment 79
Special Tools 73
Specifications 69
Starting Motor
Assembly 108
Brush Replacement/Armature Test 108
Removal and Installation 108
Stator And Ignition Module
Remove/Install 107
Test & Adjustments Specifications 69
Tests and Adjustments 77
Throttle Cable Adjustment 77
Torque Specifications 72
Troubleshooting 74
Engine Cranks But Will Not Start 75
Engine Erratic/Loss of Power 76
Engine Will Not Crank 74
Valve Guides Inspection 91
Valve Seats Recondition 91
Valves & Valve Lifter Repair Specifications 70
Valves And Springs Removal/Installation 90
Valves Inspection 90
Valves Lap 92
L
Level Mower Front-to-Rear 288
Level Mower Side-to-Side 286
Lift Assist Spring Adjustment
48C Mower Deck 284
Lift Linkage Removal and Installation 296
Live With Safety 4
Lubricant
Mixing 12
Storage 12
Synthetic 11
Lubrication
Alternative Lubricants 11
Grease 11
Hydrostatic Transmission Oil 11
Oil Specifications, Engine 9
M
Machine Identification Number 12
Main Electrical Schematic – SST15 119
Main Electrical Schematic – SST16 and SST18 121
Main Wiring Harness – SST15 123
Main Wiring Harness – SST16 and SST18 126
Metric fastener torque values
Standard 7
Mixing of lubricants 12
Mower Deck
Balancing Blades .299
Diagnostics .280
Idlers Repair .298
Jack Sheave Repair .298
Lift Linkage Removal and Installation .296
Primary Belt Tensioner Assembly .293
Primary Drive Belt Removal and Installation .291
Removal and Installation .293
Sharpening Blades .298
Wheels Adjusting
42AP .284
42M .285
48C .285
Mower Deck, 42AP
Belt Tensioner Assembly Remove and Install .307
Blades Removal and Installation .309
Mower Drive Belt Remove and Install .307
Spindles Removal and Installation .308
Mower Deck, 42M
Belt Tensioner Assembly Remove and Install .303
Blades Removal and Installation .306
Secondary Drive Belt Remove and Install .299
Spindles Removal and Installation .304
Timing Belt Remove and Install .299
Mower Deck, 48C
Belt Tensioner Assembly Remove and Install .310
Blades Removal and Installation .312
Mower Drive Belt Removal and Installation .310
Spindles Removal and Installation .311
Mower Level Adjusting
Front-to-Rear .288
Side-to-Side .286
N
Neutral Creep Adjustment .250
Neutral Creep Adjustment, Steering .250
Neutral Position Adjustment, Steering Logic .255
O
Oil Drain and Fill Transaxle .209
Oil Tank Removal and Installation .319
Operational Checkout Procedure
Steering .246
P
Park Machine Safely .3
Parking Brake Test .268
Pedals
Brake .269
Forward and Reverse .212
Power Train
Specifications .193
Torque Specifications .193
Prevent Acid Burns .2
Prevent Battery Explosions .1
Primary Belt Tensioner Assembly Repair 293
Primary Drive Belt Removal and Installation 291
Propel Pump, Motor, and Gears
Component Location 195
Propel Unit Disassembly and Assembly 220
R
Reading Electrical Schematics 114
Rear Wheel Removal and Installation 317
Recognize Safety Information 1
Remove Paint Before Welding Or Heating 3
Repair
Brakes 269
Briggs & Stratton Engine 33
Kohler Engine 84
Miscellaneous 316
Miscellaneous Specifications 315
Steering 256
Transaxle 211
Replace Safety Signs 1
Rod, Adjusting Front Steering 251
S
Schematic and Wiring Harness Legend
Electrical 118
Sector Gear, Steering Wheel 241
Serial Number Location 12
Engine 12
Transaxle 12
Service Machines Safely 2
Service Tires Safely 4
Sharpening Blades 298
Shift Pedal Linkage System 199
Specifications
42AP Mower Deck 275
42M Mower Deck 275
48C Mower Deck 275
Attachments 275
Brakes 265
Drive Train 193
Electrical 116
Power Train 193
Steering 239
General 239
Torque 239
Starting Motor
Briggs & Stratton Engine
Assembly 64
Disassembly 62
Pinion Gear Replacement 65
Removal and Installation 61
Kohler Engine
Assembly 108
Removal and Installation 108
Steering
Adjusting Tires for Difference in Circumference .255
Adjustments, Identify .249
Control, Test and Adjustment .249
Creep Adjustment .246
Creep and Tracking Adjustments .250
Diagnostics .245
Front Rod Adjustments .251
Microswitch Clearance Test and Adjustment .249
Neutral Creep Adjustment .250
Operational Checkout Procedure .246
Pump and Motor
Component Location .197
Disassembly and Assembly .225
Repair .256
Replacing Steering Filters .257
Replacing Vacuum Actuators .256
Sector Assembly Removal and Installation .259
Shaft Removal and Installation .258
Specifications .239
Steering Logic System .241
Switch Bracket Removal and Installation .261
System Operation .241
Tracking .246
Tracking Adjustment .251
Troubleshooting .245
Understanding Creep and Tracking .246
Vacuum Test .248
Wheel and Sector Gear .241
Steering Logic
Front Steering Rod Adjustment
Early Models .251
Later Models .253
Neutral Position Adjustment .255
Support Machine Properly .3
Synthetic lubricants .11
T
Tests and Adjustments
Alternator Output Test .182
Battery Charge .179
Battery Load .180
Battery Voltage & Specific Gravity .178
Brake Switch Test .189
Brakes .268
Adjustment .268
Test Drive .268
Briggs & Stratton Engine .26
Diode Test .186
Flywheel Magnet Test .183
Fuel Shutoff Solenoid Test .188
Ground Circuit .178
Ignition Coil Test – SST15 .187
Ignition Coil Test – SST16 and SST18 .188
Key Switch Test .185
Light Switch Test .184
Loaded Starter Amperage Draw 181
Miscellaneous 316
No-Load Starter Amperage Draw 181
Oil Pressure Switch Test- SST16 and SST18 190
PTO/RIS Switch Test 185
Propel Switch Test 189
Regulated Amperage Test 182
Regulated Voltage Test 182
Relay Test 184
Seat Switch Test 186
Spark Test 187
Starter Loaded Amperage Draw 181
Starter No-Load Amperage Draw 181
Starter Solenoid Test 180
Steering Vacuum Test 248
Tire Pressure 316
Transaxle 206
Drive Belt De-Clutch Adjustment 206
Fluid Level Adjustment 209
Neutral Adjustment 208
Propel Pedal Adjustment 207
Traction Drive System 206
Transport (Free Wheel) Test 208
Transaxle Bleeding 210
Vacuum Solenoid Test 190
Timing Belt Tensioning, 42M Deck 289
Tires
Adjusting for Difference in Circumference 255
Pressure 316
Removing and Installing Front Wheel 318
Removing and Installing Rear Wheel 317
Wheel (Front Bearing Repair) 318
Torque values
Inch Fastener 8
Metric fasteners, standard 7
Torques, Miscellaneous Specifications 315
Tracking
Adjustment 250
Adjustment, Steering 251
Steering Adjustment 246
Traction Drive Belt 199
Transaxle
Assembly 232
Brake Pedal and Linkage 269
Case Seal Replacement 229
Component Location 194
De-Clutch Mechanism Removal and Installation 212
Disassembly 217
Drive Belt De-Clutch Adjustment 206
Fluid Level 209
Forward/Reverse Pedals and Linkage 212
Linkage System 199
Neutral Adjustment 208
Oil Drain and Fill 209
Operation 201
Propel Pedal Adjustment 207
Propel Unit Disassembly and Assembly .220
Removal and Installation .214
Shift Pedal Linkage System .199
Steering Pump and Motor
Disassembly and Assembly .225
Tests and Adjustments .206
Traction Drive Belt Removal and Installation .211
Traction Drive Belt System .199
Transport System .204
Transport (Free Wheel) System .204
Troubleshooting
Power Train .205
Steering .245
U
Understand Signal Words .1
Use Proper Lifting Equipment .3
Use Proper Tools .2
Using High Pressure Washers .3
V
Vacuum Actuator Removal and Installation .256
Vacuum Solenoid Test .190
Vacuum Test, Steering .248
Valves
Briggs & Stratton Engine
Guide Ream .48
Inspection and Repair .47
Removal .47
W
Wear Protective Clothing .2
Wheel (Front Bearing Repair) .318
Wheel, Removing and Installing Front .318
Wheel, Removing and Installing Rear .317
Wire Color Abbreviation Chart .113
Work In Clean Area .3
Work In Ventilated Area .3