10 Common John Deere D105 Problems (+ Quick Fixes)

Imagine a beautiful summer day, with a neatly trimmed lawn as the backdrop for your outdoor activities.

But what happens when your trusted John Deere D105 lawn tractor starts acting up, throwing a wrench into your plans?

Don’t worry, you’re not alone. Many D105 owners have encountered common issues with their machines.

In this article, we’ll delve into the top 10 problems reported by users and provide practical solutions to get you back on track.

Table Chart of Common John Deere D105 Problems

ProblemCausesSolutionsFrequency & Importance
Starting ProblemsCheck fluid levels, and inspect and replace worn parts.Check and replace faulty components.Occasional, Important
Transmission IssuesLow transmission fluid, worn-out drive belt, mechanical issuesReplace the filter, clean or repair the carburetor, and ensure proper airflow.Occasional, Important
Belt SlippageDamaged or worn-out belt, improper tension, misalignmentReplace the damaged belt, and adjust tension and alignment.Common, Moderate
Poor Cutting QualityDull blades, improper deck adjustment, uneven tire pressureSharpen or replace blades, adjust deck and tire pressure.Common, Moderate
Faulty battery, alternator, and wiring connectionsClogged fuel filter, carburetor problems, insufficient airflowReplace the filter, clean or repair the carburetor, ensure proper airflow.Occasional, Important
Replace gear, and lubricate components properly.Faulty battery, alternator, wiring connectionsCheck battery charge, inspect and replace faulty components.Occasional, Important
Straighten or replace blades, replace worn bearings, and level the deck.Worn-out steering gear, lack of lubricationReplace gear, lubricate components properly.Occasional, Moderate
Fuel System TroublesFix leaks, replace damaged parts, and clean or replace the filter and pump.Fuel leaks, damaged fuel line, clogged filter, a malfunctioning pumpOccasional, Important
Deck VibrationBent or unbalanced blades, worn-out spindle bearings, unlevel deckStraighten or replace blades, replace worn bearings, level the deck.Common, Moderate
10. Build Quality & DurabilityPlastic component breakage, premature wearContact John Deere for repairs or replacements.Occasional, Moderate

John Deere D105 Lawn Tractor Problems (+ Quick Fixes)

Here are the top 10 problems frequently reported by John Deere D105 owners and possible fixes to them:

1). Starting Problems

There’s nothing more frustrating than a stubborn engine that refuses to start.

Starting problems with the John Deere D105 can stem from a faulty ignition switch, worn-out spark plug, or fuel system issues.

A loose connection in the ignition switch can disrupt the electrical current flow, while a dirty or worn spark plug hinders combustion.

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Fuel pump problems, clogged filters, or fuel line blockages can also cause starting issues.

One sunny morning, I eagerly prepared to tackle my lawn but was greeted with an unresponsive engine.

Determined to get it running, I discovered a loose connection in the ignition switch. After securing it, my John Deere D105 roared to life, and I was back on track.

Quick Fix: Check for secure connections in the ignition switch and clean or replace the spark plug. Also, ensure the fuel system is free of clogs and blockages.

2). Transmission Issues

Difficulty shifting gears or experiencing jerky movements can indicate transmission issues.

Low transmission fluid levels, a worn-out drive belt, or mechanical problems can be the culprits.

Regularly check fluid levels and top up if needed. Inspect the drive belt for wear or damage and replace it if necessary.

For persistent issues, seek professional inspection.

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Quick Fix: Regularly check transmission fluid levels and visually inspect the drive belt for wear or damage.

3). Belt Slippage

When your mower deck belt keeps slipping off or becomes loose during operation, it affects cutting performance.

Damaged or worn-out belts, improper tension, or misalignment can lead to belt slippage.

Inspect the belt for wear, replace it if necessary, and ensure proper tension and alignment for smooth deck operation.

Quick Fix: Regularly check the belt condition and adjust tension and alignment as needed.

4). Poor Cutting Quality

An unevenly cut lawn or untrimmed patches can spoil the aesthetics of your yard.

Poor cutting quality can result from dull blades, improper deck adjustment, or uneven tire pressure.

Sharpen or replace the blades regularly, adjust the deck height properly, and ensure consistent tire pressure for an even and uniform cut.

Quick Fix: Sharpen or replace the blades, adjust the deck height, and check tire pressure regularly.

5). Engine Stalling

Experiencing engine stalling during operation can be frustrating.

Clogged fuel filters, carburetor issues, or insufficient airflow can contribute to this problem.

Replace the fuel filter, clean or repair the carburetor, and ensure proper airflow to the engine for smooth operation.

Quick Fix: Replace the fuel filter and clean or repair the carburetor if needed. Ensure there are no obstructions to proper airflow.

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6. Battery and Electrical Problems

If you’re facing battery-related issues or electrical malfunctions, it can disrupt the overall performance of your D105.

Faulty batteries, alternators, or wiring connections can be the underlying causes.

Regularly check the battery charge, inspect connections, and replace faulty components to maintain a reliable electrical system.

Quick Fix: Regularly check the battery charge level and inspect wiring connections for any loose or damaged components.

7). Steering Difficulties

A stiff or unresponsive steering wheel can make maneuvering your John Deere D105 a challenging task.

Worn-out steering gear or a lack of lubrication in the system can contribute to steering difficulties.

Replacing the worn gear and properly lubricating the components can restore smooth and effortless steering.

Quick Fix: Inspect the steering gear for signs of wear and replace it if necessary. Lubricate the steering components regularly for smooth operation.

8). Fuel System Troubles

Fuel system issues such as leaks, damaged fuel lines, clogged filters, or malfunctioning pumps can disrupt the fuel flow and affect the performance of your D105.

Address any fuel leaks, replace damaged components, and clean or replace clogged filters and malfunctioning pumps to ensure a steady fuel supply to the engine.

Quick Fix: Fix any fuel leaks promptly, replace damaged fuel lines, and clean or replace clogged filters to maintain the proper fuel flow.

9). Deck Vibration

Excessive deck vibration during mowing can affect the quality of the cut and put unnecessary strain on your John Deere D105.

Bent or unbalanced blades, worn-out spindle bearings, or an unlevel deck can be the causes of deck vibration.

Straighten or replace any bent blades, replace worn bearings, and ensure the deck is properly leveled for a smooth mowing experience.

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Quick Fix: Inspect the blades for damage or imbalance and straighten or replace them as needed.

Replace worn-out spindle bearings and adjust the deck to ensure proper leveling.

10). Build Quality and Durability

Some owners have reported concerns about plastic component breakage and premature wear on their D105.

If you encounter such issues, it is recommended to contact John Deere for repairs or replacements, as they can provide the appropriate solutions for maintaining the build quality and durability of your machine.

Step-by-Step Guide: Diagnosing Common Problems with Lawn Tractors

In this step-by-step guide, we will walk you through the process of diagnosing common problems that may arise with your lawn tractor.

Step 1: Observation and Identification

Start by observing the symptoms your lawn tractor is exhibiting. Is it refusing to start, making unusual noises, or experiencing performance issues?

Take note of any specific patterns or behaviors. This initial observation will help you narrow down the potential causes.

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Step 2: Check Fluid Levels

Check the fluid levels of essential components such as the engine oil, transmission fluid, and hydraulic fluid.

Low fluid levels can cause various problems, including overheating or improper functioning.

Ensure that the fluid levels are at the recommended levels and top up if necessary.

Step 3: Visual Inspection

Perform a thorough visual inspection of your lawn tractor. Look for any signs of wear, damage, or loose connections.

Pay attention to belts, hoses, wiring, and mechanical components.

Identifying any visible issues can provide valuable clues to the underlying problems.

Step 4: Test the Battery

A weak or discharged battery can lead to starting issues or electrical malfunctions.

Use a multimeter to check the battery voltage. If the voltage is below the recommended range, recharge or replace the battery as needed.

Step 5: Fuel System

Inspect the fuel system for any problems. Check for fuel leaks, clogged fuel filters, or damaged fuel lines.

Ensure that the fuel tank is adequately filled and that the fuel is clean and free from contaminants.

Address any fuel system issues promptly to prevent engine performance problems.

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Step 6: Spark Plug Examination

Remove the spark plug and inspect its condition. A fouled or damaged spark plug can cause starting issues and poor engine performance.

Clean or replace the spark plug if necessary, following the manufacturer’s recommendations.

Step 7: Air Filter Inspection

Examine the air filter for dirt, debris, or damage. A clogged or dirty air filter can restrict airflow to the engine, affecting its performance.

Clean or replace the air filter as recommended by the manufacturer.

Step 8: Test the Ignition System

Check the ignition system components, including the ignition switch, ignition coil, and spark plug wires.

Ensure proper connections and look for signs of damage. Use a spark tester to verify if the ignition system is generating a strong spark.

Step 9: Evaluate the Drive Belt

Inspect the drive belt that transfers power from the engine to the cutting blades or transmission.

Look for signs of wear, cracks, or looseness. A worn or damaged drive belt can cause slipping or inefficient operation. Replace the belt if needed.

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Step 10: Consult the User Manual and Seek Professional Help

Refer to your lawn tractor’s user manual for specific troubleshooting steps and recommended maintenance procedures.

If you are unable to identify or resolve the issue on your own, it’s advisable to seek professional assistance.

Lawn tractor technicians have the expertise to diagnose and repair complex problems effectively.


Discover common John Deere D105 problems and troubleshooting solutions to keep your lawn mower running smoothly. Explore key issues such as engine starting problems, transmission issues, and maintenance tips for optimal performance. Gain insights into diagnosing and fixing problems to ensure your lawn remains well-maintained throughout the mowing season.


Maintaining your John Deere D105 lawn tractor’s optimal performance involves addressing common problems that may arise during its use.

Remember to perform regular maintenance, inspections, and prompt repairs to address any issues promptly.

That way, you’d ensure that your John Deere D105 lawn tractor remains in top shape, enabling you to enjoy a beautifully maintained lawn with ease and efficiency.

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