John Deere LA105 LA115 LA125 LA135 LA145 LA165 and LA175 Lawn and Garden Tractor Technical Manual TM103419 01DEC09

TM103419 LA Series John Deere Tractors
Introduction
Manual Description
Safety
Recognize Safety Information
Understand Signal Words
Special Messages
Replace Safety Signs
Handle Fluids Safely – Avoid Fires
Use Care In Handling and Servicing Batteries
Wear Protective Clothing
Parking Safely
Service Machines Safely
Use Proper Tools
Work in Clean Area
Support Machine Properly and Use Proper Lifting Equipment
Using High Pressure Washers
Illuminate Work Area Safely
Work In Ventilated Area
Warning: California Proposition 65 Warning
Remove Paint Before Welding or Heating
Avoid Harmful Asbestos Dust
Service Tires Safely
Avoid Injury From Rotating Blades, Augers and Shafts
Handle Chemical Products Safely
Dispose of Waste Properly
Live with Safety
Specifications and Information
Table of Contents
Fastener Torques
Metric Fastener Torque Values
Inch Fastener Torque Values
Metric Fastener Torque Value – Grade 7
General Information
Gasoline
Gasoline Storage
4 – Cycle Gasoline Engine Oil
Break-In Engine Oil – 4-Cycle Gasoline
Alternative Lubricants
Synthetic Lubricants
Lubricant Storage
Mixing of Lubricants
Grease
Hydrostatic Transmission Oil
Serial Number Locations
Machine Product Identification Number
Engine Serial Number
Transaxle Serial Number
Engine – Gas
Table of Contents
Specifications
General Specifications
Tests and Adjustments Specifications
Repair Specifications
Torque Specifications (Alphabetical)
Special or Essential Tools
Other Materials
Diagnostics
Starting Problems
Tests and Adjustments
Throttle/Choke Cable Adjustment
Fuel Shutoff Solenoid Test
Governor Adjustment – Static
Governor Adjustment – Dynamic
Governed Idle Adjustment
Slow Idle Carburetor Adjustment
Valve Clearance Adjustment
Armature Air Gap Adjustment
Crankcase Vacuum Test
Cylinder Leakdown Test
Repair
Upper Blower Housing Removal and Installation
Air Cleaner Service
Carburetor Removal and Installation
Carburetor Disassembly
Carburetor Inspection
Carburetor Assembly
Breather Valve Service
Engine Removal
Engine Installation
Cylinder Head Removal and Installation
Cylinder Head Inspection and Repair
Valve Removal
Valves Reface
Valves Installation
Governor Removal and Installation
Piston, Rings and Rod
Piston Inspection
Connecting Rod Inspection
Cylinder Bore Inspection
Cylinder Bore Honing
Cylinder Bore Cleaning
Resizing Cylinder Bore
Flywheel Removal and Installation
Crankshaft and Cam Gear Removal
Balance System Removal and Installation
Crankshaft/Cam Gear Installation
Magneto Bearing Inspection
Cam Gear Bearing Inspection
PTO Journal Inspection and Seal Replacement
Starting Motor Removal and Installation
Starting Motor Disassembly
Starting Motor Assembly
Starting Motor Pinion Gear Replacement
Engine – V-Twin
Table of Contents
Specifications
Engine Specifications
Tests and Adjustments Specifications
Repair Specifications
Torque Specifications (Alphabetical)
Special or Essential Tools
Other Materials
Diagnostics
Engine Will Not Start
Test and Adjustments
Throttle Cable Adjustment
Choke Cable Adjustment
Throttle/Choke Cable Adjustment – All Models
Fuel Shutoff Solenoid Test
Governor Static Adjustment
Governor Dynamic Adjustment
Crankcase Vacuum Test
Cylinder Leakdown Test
Cylinder Balance Test
Ignition Armature Air Gap Adjustment
Valve Clearance Adjustment
Engine Oil Pressure Test
Repair
Upper Blower Housing Removal and Installation
Air Cleaner Removal and Installation
Two Barrel Carburetor
Two Barrel Carburetor Repair
Engine Removal
Engine Installation
Cylinder Air Guides Removal and Installation
Cylinder Head Removal and Installation
Cylinder Head Inspection and Repair
Valve Removal
Valve Inspection and Repair
Valves Lap
Valve Installation
Pistons, Rings and Rods Removal and Installation
Piston Inspection
Connecting Rod Inspection
Assemble Piston and Connecting Rod
Cylinder Bore Inspection
Cylinder Bore Honing
Cylinder Bore Cleaning
Resizing Cylinder Bore
Flywheel Removal and Installation
Crankshaft and Camshaft Removal, Inspection and Installation
Magneto Bearing Inspection
PTO and Cam Bearing Inspection
Breather Valve Service
Oil Pump Removal and Installation
Starting Motor Removal and Installation
Starting Motor Disassembly
Starting Motor Assembly
Starting Motor Pinion Gear Replacement
Electrical
Table of Contents
General Information
Reading Electrical Schematics
Theory Of Operation Information
Diagnostic Information
Wire Color Abbreviation Chart
Common Circuit Tests
Conductors For 12 Volt Circuits
Specifications
Electrical
Component Location
Component Location – LA105/115/125/135
Component Location – LA145/155/165/175
Schematics and Harnesses
Main Wiring Schematic LA105/115/125/135
Schematic and Wiring Harness Legend – LA105/115/125/135
W1 and W2 Main Wiring Harnesses LA105/115/125/135
W1 Front Main Wire Harness Color Codes – LA105/115/125/135
W2 Rear Main Wire Harness Color Codes – LA105/115/125/135
Schematic And Wiring Harness Legend – LA145/155/165/175
Main Wiring Schematic – LA145/155/165/175
W1 and W2 Wiring Harness LA145/155/165/175
W1 Front Main Wire Harness Color Codes – LA145/155/165/175
W2 Rear Main Wire Harness Color Codes – LA145/155/165/175
W3 and W4 Jumper Wiring Harnesses – All Models
W5 Headlight Wiring Harness – All Models
W6 Engine Wiring Harness – LA105/115/125/
W6 Engine Wiring Harness – LA135/145/155/165/175
Stator and Voltage Regulator/Rectifier – LA105/115
Stator and Voltage Regulator/Rectifier – LA145/155/165/175
N1 Voltage Regulator/Rectifier
Y2 Fuel Shutoff Solenoid
Y3 PTO Clutch – LA145/155/165/175
Operation and Diagnostics
Power Circuit Operation – LA105/115/125/135
Power Circuit Electrical Schematic – LA105/115/125/135
Power Circuit Diagnosis – LA105/115/125/135
Power Circuit Operation – LA145/155/165/175
Power Circuit Electrical Schematic – LA145/155/165/175
Power Circuit Diagnosis – LA145/155/165/175
Cranking Circuit Operation – All Models
Cranking Circuit Electrical Schematic – All Models
Cranking Circuit Diagnosis – All Models
Ignition and Shutoff Circuit Operation – All Models
Ignition and Shutoff Circuit Electrical Schematic – LA105/115/125/135
Ignition and Shutoff Circuit Electrical Schematic – LA145/155/165/175
Ignition and Shutoff Circuit Diagnosis – All Models
Charging Circuit Operation
Charging Circuit Electrical Schematic – All Models
Charging Circuit Diagnosis – All Models
PTO Clutch Circuit Operation – LA145/155/ 165/175
PTO Clutch Circuit Electrical Schematic – LA145/155/165/175
PTO Clutch Circuit Diagnosis – LA145/155/ 165/175
PTO with RIO Circuit Operation – LA105/115/ 125/135
PTO with RIO Circuit Schematic – LA105/115/125/135
PTO with RIO Circuit Diagnosis – LA105/115/ 125/135
PTO with RIO Circuit Operation – LA145/155/ 165/175
PTO with RIO Circuit Schematic – LA145/155/165/175
PTO with RIO Circuit Diagnosis – LA145/155/ 165/175
Headlight Circuit Operation – All Models
Headlight Circuit Electrical Schematic – All Models
Headlight Circuit Diagnosis – All Models
Hour Meter/Service Indicator Circuit Operation
Hour Meter/Service Indicator Circuit Schematic – LA105/115/125/135
Hour Meter/Service Indicator Circuit Schematic – LA145/155/165/175
Hour Meter/Service Indicator Circuit Diagnosis
Tests and Adjustments
Ground Circuit Tests
Battery Voltage and Specific Gravity Tests
Charge Battery
Battery – Load Test
Starting Solenoid Test – All Models
Starting Motor Amperage Draw Test – Loaded
Starting Motor Amperage Draw Test – No-Load
Flywheel Ignition Magnet Test
Flywheel Stator Magnets Test
Regulated Voltage Test
Stator Output Test
Regulated Amperage Test
Relay Test
Key Switch Test
PTO/Brake Switch Test
PTO Switch Test – LA145/155/165/175
Electric PTO Clutch Test – LA145/155/165/175
RIO Switch Test
RIS Switch Test
Seat Switch Test
Diode Test – Ignition Coils
Spark Test
Fuel Shutoff Solenoid Test
Hour Meter/Service Indicator Test
Armature Air Gap Adjustment
Power Train – Gear
Table of Contents
Specifications
General Specifications
Torque Specifications
Other Materials
Component Location
Drive Components
Forward and Reverse Drive and Linkage
Transaxle Components
Theory of Operation
Clutch Pedal And Belt Traction Drive Operation
Transaxle Operation
Brake System Operation
Diagnostics
Gear Transmission Check
Troubleshooting
Tests and Adjustments
Shift Linkage Adjustment
Repair
Traction Drive Belt Removal and Installation
Shift Linkage Removal and Installation
Transaxle Removal and Installation
Transaxle Disassembly
Transaxle Assembly
Power Train – Hydrostatic
Table of Contents
Specifications
Specifications
Adjustment Specifications
Torque Specifications
Other Materials
Components
Transaxle Components
Drive Components – LA115, 125, 135, 145, and 155
Drive Components – LA165 and 175
Forward/Reverse Pedals and Linkage
Theory of Operation
Traction Drive Belt System
Transaxle
Forward and Reverse Pedals
Freewheel System
Brake System
Cruise Control
Internal Dampening System (IDS)
Hydrostatic System Operation
Diagnostics
Hydrostatic Transmission Check
Hydrostatic Transmission Diagnosis
Low Power When Hot
Will Not Move Forward or Reverse
Machine Moves In One Direction Only
Machine Does Not Achieve Full Speed
Noisy Operation
Machine Creeps
Erratic Speed
Brake Switch Will Not Engage
Park Brake Does Not Hold Machine
Transaxle Whines When Brake Is Used
Tests and Adjustments
Traction Drive System Test
Neutral Creep Adjustment
Transport (Freewheel) Test
Transaxle Bleeding
Repair
Traction Drive Belt Removal and Installation – LA115, 125, 135 and 145
Traction Drive Belt Removal and Installation – LA155, 165 and 175
Traction Drive Belt Tensioner Removal and Installation
Transaxle Removal and Installation
Control Pedal Removal and Installation
Steering
Table of Contents
Specifications
General Specifications
Torque Specifications
Component Location
Steering System Components
Steering System Components – Explode
Tests and Adjustments
Toe-In Adjustment
Repair
Steering Shaft and Pedestal Removal and Installation
Steering Sector Gear Removal and Installation
Front Axle Spindle Replacement
Front Axle Removal and Installation
Brakes
Table of Contents
Specifications
General Specifications
Torque Specifications
Component Location
Brake System – Gear Transaxle
Brake System – Hydro Transaxle
Tests and Adjustments
Park Brake Test
Test Drive
Brake Adjustment – Gear
Brake Adjustment – Hydro
Repair
Brake Linkage Removal and Installation – Gear
Brake Pedal Assembly Removal and Installation – Gear
Brake Removal and Installation – Gear
Park Brake Lever and Linkage
Brake Linkage Removal and Installation – Hydro
Brake Pedal Assembly Removal and Installation – Hydro
Attachments
Table of Contents
Specifications
Repair Specifications
Component Location
Deck Lift Assembly
Deck Lift Components
42-Inch Mower Deck
Idlers and Sheaves – 42-Inch Deck
Spindle Cross Section – 42-Inch Deck
Engagement – 42-Inch Deck
48-Inch Mower Deck
Idlers and Sheaves – 48-Inch Deck
Spindle Cross Section – 48-Inch Deck
54-Inch Mower Deck
Idlers and Sheaves – 54-Inch Deck
Spindle Cross Section – 54-Inch Deck
Diagnostics
Mower Drive Checks
Mower Deck Troubleshooting
Tests and Adjustments
Checking Mower Level
Adjusting Mower Level
Spindle Brake Adjustment – 42-Inch
Mower Belt Tension Adjustment – 42-Inch
Adjusting Mower Deck Wheels
Repair
Blade Brake Removal and Installation – 42- Inch
Mower Blade Removal and Installation
Sharpen and Balance Blades
Removing and Installing Machine Shields
Removing Mower Deck
Installing Mower Deck
Primary Drive Belt Removal and Installation
Spindle Removal and Installation
Spindle Disassembly and Assembly – 54-Inch Deck
Mower Deck Lift Linkage Removal and Installation
Miscellaneous
Table of Contents
Specifications
Repair Specifications
Tests and Adjustments
Tire Pressure Adjustment
Repair
Front Wheel Removal and Installation
Front Wheel Bushing Removal and Installation
Rear Wheel Removal and Installation
Hood Removal and Installation
Seat and Support Removal and Installation
Fenderdeck Removal and Installation
Fuel Tank Removal and Installation
Index
A
B
C
D
E
F
G
H
I
L
M
N
P
R
S
T
U
V
W