john deer LA125 - User Manual

Questions and Answers

M
Michael GonzalezAug 21, 2025
Why is my john deer LA125 engine hard to start?
- R
  Rebecca YuAug 21, 2025
  Your John Deer Tractor engine might be hard to start due to several reasons. The carburetor may need adjustment or cleaning, the choke cable might not be properly adjusted, or the fuel filter could be clogged. Other potential causes include a faulty spark plug, stale or improper fuel, loose or corroded electrical connections, or using the incorrect engine oil viscosity. Consider adjusting or cleaning the carburetor, adjusting the choke cable, cleaning or replacing the fuel filter, replacing the spark plug, using fresh, proper fuel, inspecting and securing electrical connections, and using the correct engine oil viscosity.
J
Joshua BergSep 4, 2025
Why john deer LA125 battery will not charge?
- D
  Douglas WallaceSep 4, 2025
  If your John Deer Tractor battery won't charge, it could be due to a dead cell in the battery, in which case you should replace the battery. Dirty battery cables and terminals can also prevent charging, so clean them. Low engine speed or excessive idling can also affect battery charging, so increase the engine speed.
C
Christopher RamirezSep 2, 2025
Why does my john deer LA125 Tractor engine run unevenly?
- J
  James WilliamsSep 2, 2025
  An uneven running engine in your John Deer Tractor can be caused by several factors. The cooling fins could be plugged, electrical connections might be loose, or the choke or throttle cable could be sticking. Additionally, the fuel line or fuel filter might be plugged, the fuel could be stale or dirty, or the improper fuel type could be in use. A plugged air cleaner element can also cause this issue. Try cleaning the cooling fins, tightening electrical connections, inspecting and freeing sticking cables, clearing the plugged fuel line or filter, replacing with fresh fuel, using the proper fuel type, and cleaning or replacing the air cleaner element.
R
Ricardo EdwardsSep 1, 2025
Why john deer LA125 vibrates too much?
- M
  Matthew Scott MDSep 1, 2025
  Excessive vibration or rattling in your John Deer Tractor can be attributed to several factors. The attachment drive belts may be worn or damaged, or the traction drive belt could be damaged or worn. Dirt on the drive sheaves or blades that are bent or out of balance can also cause these issues. Consider replacing the worn or damaged attachment drive belts, replacing the damaged or worn traction drive belt, cleaning the drive sheaves, and repairing or balancing the blades.
M
mooreshannonAug 30, 2025
What causes poor engine performance in john deer LA125?
- D
  Dale WalkerAug 30, 2025
  Poor engine performance in your John Deer Tractor can be caused by dirt in the fuel system or old fuel. Replace the fuel with fresh stabilized fuel. It is also recommended to obtain fuel from another supplier before suspecting machine problems. Suppliers blend fuels differently, and changing suppliers will generally solve any performance problems. Fuel blended with alcohol or ether may contribute to performance problems by causing gum and varnish deposits, especially if fuel is stored for several weeks or more. Obtain fresh fuel.
J
Juan YoungAug 29, 2025
Why does my John Deer Tractor engine backfires?
- S
  sarah33Aug 29, 2025
  Your John Deer Tractor engine might backfire due to a faulty spark plug, so replace it. Also, ensure the operator is seated, as raising off the seat can cause backfiring.
M
Marcus BarkerAug 27, 2025
Why john deer LA125 Tractor starter does not work?
- A
  Alexandria WatsonAug 28, 2025
  If the starter on your John Deer Tractor isn't working or turning the engine, the brake pedal may not be depressed, or the mower might be engaged. Ensure the brake pedal is depressed and the mower is disengaged. Corroded battery terminals or a discharged battery could also be the cause, so clean the battery terminals and charge the battery. A blown fuse can also prevent the starter from working, so replace the blown fuse. If the fusible link in the starting circuit is blown, consult your authorized dealer.
R
Raymond MartinezAug 26, 2025
What to do if john deer LA125 engine overheats?
- C
  Christopher ClarkAug 27, 2025
  If your John Deer Tractor engine is overheating, check the engine air intake screen and clean it if it's plugged. Also, clean the cooling fins. Ensure the engine oil level is correct, adjusting if it's too low or too high. Avoid operating the engine for extended periods at a slow idle speed.
B
Brianna MccormickAug 25, 2025
Why does my john deer LA125 engine lose power?
- J
  John CaseAug 25, 2025
  Your John Deer Tractor engine may be losing power due to several reasons: the engine might be overheating, there could be too much oil in the engine, the air cleaner might be dirty, or the spark plug could be faulty. Also, the travel speed might be too fast for the conditions, or you might be using the improper fuel. In order to solve this problem you should check the engine cooling system, check and adjust oil level, clean or replace air cleaner, replace the faulty spark plug, reduce travel speed, and use proper fuel type.
W
wayne74Aug 23, 2025
What to do if John Deer Tractor engine will not start?
- M
  Matthew MurrayAug 23, 2025
  If your John Deer Tractor engine won't start, make sure the brake pedal is depressed and the mower is disengaged. Check that the spark plug wire is securely connected and that you're using the correct fuel type. Also, inspect the fuel filter and clean or replace it if it's plugged. Finally, check the safety switch and replace it if it's defective. If these steps don't resolve the issue, refer to the Electrical Troubleshooting Section.

Summary

Introduction

Thank You for Purchasing a John Deere Product

Expresses appreciation and wishes for safe, satisfied use of the machine.

Using Your Operators Manual

Explains the importance of the manual for safe and effective machine use and training.

Special Messages

Highlights important messages for safety concerns, machine damage, and operating/servicing information.

Product Identification

Record Identification Numbers

Instructions to record machine and engine identification numbers for service.

Register Your Product and Warranty Online

Guides users to register their product online for post-sales service and information.

Safety Labels

Refers to safety label locations and understanding their meaning.

Safety Labels

Understanding The Machine Safety Labels

Explains the use of DANGER, WARNING, and CAUTION symbols to highlight hazards.

Safety

Operating Safely

Provides essential safety instructions for operating the cutting machine to prevent injury or death.

Using a Spark Arrestor

Details the requirement and availability of a spark arrestor for fire prevention.

Checking Mowing Area

Advises on checking the mowing area for objects and obstacles before operation.

Parking Safely

Outlines the steps for safely parking the machine.

Protect Children

Warns about the dangers of children around mowing machines and how to protect them.

Avoid Tipping

Provides crucial advice on operating safely on slopes to prevent tipping accidents.

Keep Riders Off

Instructs to allow only the operator on the machine to prevent injury.

Towing Loads Safely

Gives guidelines for safely towing loads, emphasizing speed and distance.

Wear Appropriate Clothing

Advises on wearing suitable clothing, footwear, and eye protection for safe operation.

Driving Safely on Public Roads

Offers safety tips for driving the machine on public roads.

Practice Safe Maintenance

Details safe practices for performing maintenance on the machine.

Avoid High Pressure Fluids

Warns about hazards associated with high-pressure fluids and how to handle them.

Prevent Fires

Provides precautions to prevent fires related to machine operation and storage.

ASSEMBLY

Handling Fuel Safely

Provides detailed safety instructions for handling fuel due to its flammability.

Tire Safety

Explains the dangers of explosive tire separation and safe practices.

Checking Wheel Hardware

Emphasizes the importance of checking wheel hardware tightness.

Handling Waste Product and Chemicals

Advises on safe disposal of waste products and chemicals.

Charge and Connect Battery

Provides instructions and cautions for charging and connecting the battery.

OPERATING CONTROLS

Operator Station Controls (LA105)

Identifies and explains the various controls on the operator station for LA105 models.

Operator Station Controls (LA115, LA125, LA135)

Identifies and explains the various controls on the operator station for LA115, LA125, LA135 models.

Operator Station Controls (LA145, LA155, LA165, LA175)

Identifies and explains the various controls on the operator station for LA145, LA155, LA165, LA175 models.

OPERATING

Daily Operating Checklist

Lists essential checks to perform before operating the machine daily.

Adjusting Seat

Provides instructions on how to adjust the operator's seat for comfort and control.

Lumbar Seat Adjustment (LA165, LA175)

Explains how to adjust the lumbar support on specific models.

Adjusting Cutting Height

Details how to adjust the mower deck cutting height.

Adjusting Mower Deck Level

Guides on adjusting the mower deck level for optimal cutting performance.

Checking Mower Deck Level

Explains how to check the mower deck for proper leveling.

Adjusting Mower Deck Wheels

Details how to adjust the mower deck wheels for proper ground support.

Testing Safety Systems

Outlines procedures for testing critical safety systems before operation.

Testing Park Brake Switch

Describes how to test the park brake switch for proper function.

Testing Park Brake

Explains how to test the park brake to ensure it prevents machine movement.

Testing Attachment Engagement Switch or Lever

Details how to test the attachment engagement controls for proper stopping.

Testing Seat Switch

Provides tests for the seat switch to ensure engine/mower stops when operator leaves seat.

Testing Reverse Implement Option (RIO)

Explains how to test the RIO feature to ensure attachment stops when reversing.

Using the Park Brake

Instructs on how to lock and unlock the park brake.

Using the Hour Meter and Service Reminder

Explains the function of the hour meter and service reminder indicators.

Using Key Switch and Headlights

Describes the operation of the key switch and headlights.

Starting the Engine

Provides step-by-step instructions for safely starting the engine.

Idling the Engine

Offers guidance on proper engine idling procedures to avoid damage.

Stopping the Engine

Details the correct procedure for stopping the engine to prevent damage.

Using Travel Controls on Gear Transmission

Explains how to use the travel controls for gear transmission models.

Using Travel Controls on Automatic Transmission

Explains how to use the travel controls for automatic transmission models.

Using The Reverse Implement Option (RIO)

Details how to use the RIO feature when backing up.

Using Cruise Control (LA125, LA135, LA145, LA155, LA165, LA175)

Explains how to engage and disengage cruise control on specific models.

Engaging and Disengaging Mower

Provides instructions for engaging and disengaging the mower deck.

Using Mulch Cover (107 cm (42 in.) and 122 cm (48 in.) Mower Decks (If Equipped))

Guides on installing and using the mulch cover.

Unplugging Mower, Bagger, or Material Collection System

Explains how to safely unplug attachments like mowers or baggers.

Checking For Plugging While Driving

Describes how to check for plugged chutes or bags during operation.

Removing Debris From Inspection Points

Provides instructions for safely removing debris from inspection points.

Moving Machine by Hand

Details how to safely move the machine by hand.

Using Weights

Advises on the use of weights to improve stability and prevent damage.

Using Tire Chains

Provides recommendations for using tire chains.

Using Accessories

Briefly mentions using accessories.

SERVICE INTERVALS

Using the Power Port (If Equipped)

Explains the use of the power port for accessories.

Using Cargo Mount System

Describes the use of cargo mount brackets for attachments.

Using Storage Accessories

Mentions using storage accessories like the pocket.

Choosing Mower Blades

Discusses different types of mower blades and their uses.

Mowing Tips

Offers recommendations for achieving the best lawn cut quality.

Service Intervals

Lists recommended maintenance intervals for servicing the machine.

SERVICE LUBRICATION

Lubricating Front Axle

Details the lubrication points for the front axle.

Wheel Spindles and Bushings

Explains how to lubricate wheel spindles and bushings.

Front Axle Pivot

Describes how to lubricate the front axle pivot.

Lubricating Pivot Points (107 cm (42 in.) Mower Deck)

Details lubrication for pivot points on the 107 cm mower deck.

Grease

Provides recommendations for John Deere greases.

SERVICE ENGINE

Engine Warranty Maintenance Statement

Outlines warranty statements related to engine maintenance.

Avoid Fumes

Warns about the dangers of engine exhaust fumes and safe operating environments.

Engine Oil

Discusses engine oil viscosity based on temperature.

Checking Engine Oil Level

Provides instructions for checking the engine oil level.

Changing Engine Oil and Filter

Details the procedure for changing the engine oil and filter.

Cleaning Air Intake Screen and Engine Fins

Explains how to clean the air intake screen and engine fins.

SERVICE TRANSMISSION

Checking Transmission

States that the transmission is sealed and requires dealer service for problems.

Service Mower

Refers to procedures for servicing the mower.

Removing or Installing Mower Drive Belt at Engine Drive Sheave (122 cm (48 in.) and 137 cm (54 in.) Mower Deck)

Instructions for removing/installing mower drive belts on specific deck sizes.

SERVICE MOWER

Removing Mower Deck

Detailed steps for safely removing the mower deck from the machine.

Installing Mower Deck

Detailed steps for safely installing the mower deck onto the machine.

Replacing Mower Drive Belt (122 cm (48 in.) and 137 cm (54 in.) Mower Decks)

Instructions for replacing the mower drive belt on specific deck sizes.

Replacing Mower Drive Belt (107 cm (42 in.) Mower Deck)

Instructions for replacing the mower drive belt on the 107 cm mower deck.

Adjusting Mower Belt Tension (107 cm (42 in.) Mower Deck)

Guides on adjusting the mower belt tension for the 107 cm deck.

Adjusting Spindle Brakes (107 cm (42 in.) Mower Deck)

Details how to adjust spindle brakes on the 107 cm mower deck.

Checking for Bent Mower Blades

Explains how to check mower blades for damage and balance.

SERVICE ELECTRICAL

Servicing Mower Blades

Instructions for servicing mower blades, including removal, installation, and sharpening.

Balancing Blades

Provides steps for balancing mower blades for proper operation.

Service the Battery Safely

Offers crucial safety precautions for servicing the battery.

Cleaning Battery and Terminals

Details the process for cleaning battery terminals.

Using Booster Battery

Provides instructions and safety warnings for using a booster battery.

SERVICE MISCELLANEOUS

Using Proper Fuel

Advises on the correct type and handling of fuel for the machine.

Filling Fuel Tank

Provides instructions and cautions for filling the fuel tank.

Checking Tire Pressure

Details how to check tire pressure for proper inflation.

Removing and Installing Hood

Instructions for removing and installing the machine hood.

Cleaning Plastic Surfaces

Offers guidance on cleaning plastic surfaces without causing damage.

Cleaning and Repairing Metal Surfaces

Provides instructions for cleaning and repairing metal surfaces.

Repairing Minor Scratches (surface scratch)

Details how to repair minor surface scratches.

Removing and Installing Front Wheel Assembly

Instructions for removing and installing the front wheel assembly.

Removing and Installing Rear Wheel Assembly

Instructions for removing and installing the rear wheel assembly.

TROUBLESHOOTING

Using Troubleshooting Chart

Introduces the chart for diagnosing and resolving machine problems.

Engine

Section for troubleshooting engine-related issues.

Engine (continued)

Continues troubleshooting engine-related issues.

Electrical

Section for troubleshooting electrical issues.

Tractor

Section for troubleshooting tractor-related issues.

Mower

Section for troubleshooting mower-related issues.

STORAGE

Storing Safety

Provides safety precautions for storing the machine, focusing on fuel and fire risks.

Preparing Machine for Storage

Details steps to prepare the machine for storage to prevent damage.

Preparing Fuel and Engine For Storage

Explains how to prepare the fuel and engine for long-term storage.

SPECIFICATIONS

Engine

Lists engine specifications including clearances, torque, and filter types.

Gear Model LA105

Provides detailed specifications for the LA105 gear model.

Automatic Model LA115

Provides detailed specifications for the LA115 automatic model.

Automatic Model LA125

Provides detailed specifications for the LA125 automatic model.

Automatic Models LA135 and LA145

Provides detailed specifications for LA135 and LA145 automatic models.

Automatic Model LA155

Provides detailed specifications for the LA155 automatic model.

Automatic Models LA165 and LA175

Provides detailed specifications for LA165 and LA175 automatic models.

Electrical System

Lists specifications for the electrical system, including charging and battery.

Capacities

Lists capacities for engine oil, fuel tank, etc.

Fuel System (All Models)

Details recommended fuel types.

Recommended Lubricants (All Models)

Lists recommended engine oil and grease.

Dimensions

Provides dimensional data for various machine models.

Weight

Lists the weight of various machine models.

Tires

Provides tire sizes and pressure information for different models.

Mower Deck - 107 cm (42 in.)

Lists specifications for the 107 cm mower deck.

Mower Deck - 122 cm (48 in.)

Lists specifications for the 122 cm mower deck.

Mower Deck - 137 cm (54 in.)

Lists specifications for the 137 cm mower deck.

WARRANTY

Product Warranty

Describes the product warranty provided by John Deere.

California and U.S. EPA Emissions Control System Warranty Statement (Small Off-Road Gas Engines)

Explains emissions control system warranty rights and obligations.

Manufacturers Warranty Coverage

Details the warranty coverage for emissions-related parts.

Owners Warranty Responsibilities

Outlines the owner's responsibilities for maintaining warranty coverage.

General Emissions Warranty Coverage

Covers the duration and scope of the general emissions warranty.

Emissions Warranty Interpretation

Clarifies how the emissions warranty applies to parts.

Emissions Warranty Parts List

Lists parts covered under the emissions warranty.

GETTING QUALITY SERVICE

Service Literature

Provides information on obtaining service literature like manuals and catalogs.

Parts

Recommends John Deere quality parts and how to order them.

Order Service Parts Online

Directs users to a website for ordering service parts.

Part Numbers

Lists part numbers for various components like blades and belts.

Filters

Lists part numbers for various filters.

Spark Plug

Lists the part number for the spark plug.

Battery

Lists the part number for the battery.

Home Maintenance Kit (HMK)

Lists the contents and part numbers for home maintenance kits.

John Deere Quality Continues with Quality Service

Emphasizes John Deere's commitment to quality service.

SERVICE RECORD

Record Service Dates

Provides a table to record service dates for maintenance tasks.

john deer LA125 Specifications

General

Brand	john deer
Model	LA125
Category	Tractor
Language	English

Related product manuals

john deer LA125 - User Manual

Table of Contents

Questions and Answers

Summary

Introduction

Thank You for Purchasing a John Deere Product

Using Your Operators Manual

Special Messages

Product Identification

Record Identification Numbers

Register Your Product and Warranty Online

Safety Labels

Safety Labels

Understanding The Machine Safety Labels

Safety

Operating Safely

Using a Spark Arrestor

Checking Mowing Area

Parking Safely

Protect Children

Avoid Tipping

Keep Riders Off

Towing Loads Safely

Wear Appropriate Clothing

Driving Safely on Public Roads

Practice Safe Maintenance

Avoid High Pressure Fluids

Prevent Fires

ASSEMBLY

Handling Fuel Safely

Tire Safety

Checking Wheel Hardware

Handling Waste Product and Chemicals

Charge and Connect Battery

OPERATING CONTROLS

Operator Station Controls (LA105)

Operator Station Controls (LA115, LA125, LA135)

Operator Station Controls (LA145, LA155, LA165, LA175)

OPERATING

Daily Operating Checklist

Adjusting Seat

Lumbar Seat Adjustment (LA165, LA175)

Adjusting Cutting Height

Adjusting Mower Deck Level

Checking Mower Deck Level

Adjusting Mower Deck Wheels

Testing Safety Systems

Testing Park Brake Switch

Testing Park Brake

Testing Attachment Engagement Switch or Lever

Testing Seat Switch

Testing Reverse Implement Option (RIO)

Using the Park Brake

Using the Hour Meter and Service Reminder

Using Key Switch and Headlights

Starting the Engine

Idling the Engine

Stopping the Engine

Using Travel Controls on Gear Transmission

Using Travel Controls on Automatic Transmission

Using The Reverse Implement Option (RIO)

Using Cruise Control (LA125, LA135, LA145, LA155, LA165, LA175)

Engaging and Disengaging Mower

Using Mulch Cover (107 cm (42 in.) and 122 cm (48 in.) Mower Decks (If Equipped))

Unplugging Mower, Bagger, or Material Collection System

Checking For Plugging While Driving

Removing Debris From Inspection Points

Moving Machine by Hand

Using Weights

Using Tire Chains

Using Accessories

SERVICE INTERVALS

Using the Power Port (If Equipped)

Using Cargo Mount System

Using Storage Accessories

Choosing Mower Blades

Mowing Tips

Service Intervals

SERVICE LUBRICATION

Lubricating Front Axle