Husqvarna 137 Chainsaw Repair (5 Pro Fixes For Chain Lockup)

The Husqvarna 137 Chainsaw Repair (5 Pro Fixes for Chain Lockup)

Isn’t it ironic? The very tool designed to liberate wood, to set it free from the trunk, can itself become a prisoner, bound by its own chain. A locked-up chainsaw chain can turn a productive day into a frustrating standstill. I’ve been there, staring at a seemingly lifeless saw, wondering what gremlin has taken up residence within its workings. That’s why I’m here to share my insights into the Husqvarna 137, a workhorse of a chainsaw, and how to tackle one of its most common issues: chain lockup. It’s a problem that plagues both seasoned pros and weekend warriors alike, and understanding the root causes is the first step to getting back to cutting.

I remember one particularly frustrating afternoon in the Oregon woods. I was felling a sizable Douglas fir, the kind that makes your back ache just looking at it. My trusty Husqvarna 137, usually a reliable partner, suddenly seized up mid-cut. The chain was locked solid. The initial wave of frustration was quickly followed by the sinking realization that I was miles from my truck, with a rapidly approaching sunset. After a bit of on-the-spot troubleshooting (and a few choice words), I managed to diagnose the issue – a combination of improper chain tension and sawdust buildup. That experience, and many others like it, has taught me the importance of understanding the mechanics of these machines and how to properly maintain them.

This article isn’t just about fixing a problem; it’s about preventing it in the first place. It’s about understanding your Husqvarna 137, its quirks, and its needs. It’s about empowering you to troubleshoot and repair common issues, saving you time, money, and a whole lot of frustration. So, let’s dive into the five pro fixes for chain lockup on the Husqvarna 137 chainsaw.

Understanding the Husqvarna 137 Chainsaw

The Husqvarna 137 is a popular choice for homeowners and light-duty users due to its affordability, ease of use, and reliability. However, like any machine, it requires regular maintenance to perform optimally. Chain lockup is a common issue, and understanding the causes can save you time and frustration.

Anatomy of the Chain and Bar System

The chain and bar system is the heart of any chainsaw. Here’s a breakdown of the key components:

Chain: The cutting element, consisting of cutters, tie straps, and drive links.
Guide Bar: The metal blade that supports and guides the chain.
Sprocket: The toothed wheel that drives the chain around the bar.
Tensioning Mechanism: Allows you to adjust the chain tension.

Common Causes of Chain Lockup

Several factors can contribute to chain lockup on the Husqvarna 137:

Improper Chain Tension: Too tight, and the chain binds; too loose, and it can derail.
Insufficient Lubrication: Lack of bar and chain oil leads to friction and overheating.
Sawdust Buildup: Sawdust accumulation in the bar groove and around the sprocket can impede chain movement.
Damaged Chain or Bar: Bent or damaged components can cause binding.
Clutch Issues: A faulty clutch can prevent the chain from turning freely.

Pro Fix #1: Master the Art of Chain Tensioning

Proper chain tension is paramount for smooth operation and preventing lockup. Think of it like a guitar string – too tight, and it’ll snap; too loose, and it won’t play. The same principle applies to your chainsaw chain.

The Correct Tension: A Balancing Act

The ideal chain tension allows the chain to be pulled freely around the bar by hand, but it should not sag excessively. A good rule of thumb is to pull the chain away from the bar at the midpoint. You should be able to pull the drive links out approximately 1/8 inch (3mm) to 1/4 inch (6mm).

Step-by-Step Chain Tensioning Guide

Loosen the Bar Nuts: Use the wrench to loosen the bar nuts that secure the side cover. Don’t remove them completely; just loosen them enough to allow the bar to move.
Locate the Tensioning Screw: The Husqvarna 137 typically has a side-mounted tensioning screw.
Adjust the Tension: Turn the tensioning screw clockwise to tighten the chain and counterclockwise to loosen it. Make small adjustments and check the tension frequently.
Tighten the Bar Nuts: Once you’ve achieved the correct tension, tighten the bar nuts securely.
Check Again: After tightening the bar nuts, double-check the chain tension to ensure it hasn’t changed.

Pro Tips for Chain Tensioning

Tension When Cold: Always tension the chain when it’s cold. As the chain heats up during use, it will expand, and a chain tensioned when hot may become too tight when it cools down.
New Chain Adjustment: A new chain will stretch more than an older chain. Check and adjust the tension frequently during the first few uses.
Consider Wood Type: Softer woods like pine tend to produce more sawdust, which can affect chain tension. Check and adjust more frequently when cutting softwoods.

Pro Fix #2: Oil is Your Chainsaw’s Lifeblood

Adequate lubrication is crucial for reducing friction, preventing overheating, and extending the life of your chain and bar. Without proper lubrication, the chain and bar will overheat, leading to premature wear and, you guessed it, chain lockup.

The Importance of Bar and Chain Oil

Bar and chain oil is specifically formulated to adhere to the chain and bar, providing continuous lubrication even at high speeds. It reduces friction between the chain and bar, minimizing heat buildup and wear.

Choosing the Right Oil

Viscosity: Use a bar and chain oil with the correct viscosity for your climate. Thicker oils are better for warmer temperatures, while thinner oils are suitable for colder temperatures.
Tackiness: Look for oils with good “tackiness,” meaning they cling well to the chain and bar, reducing oil splatter.
Biodegradable Options: Consider using biodegradable bar and chain oil, especially if you’re working in environmentally sensitive areas.

Maintaining the Oil System

Check the Oil Level: Regularly check the oil level in the reservoir and refill as needed.
Inspect the Oiler: Ensure the oiler is functioning correctly. You should see oil being thrown off the chain when the saw is running.
Clean the Oiler: Periodically clean the oiler to remove any debris that may be clogging it.

Diagnosing Oiling Issues

No Oil Flow: If you’re not seeing any oil being thrown off the chain, check the oil reservoir, oil filter, and oiler pump.
Insufficient Oil Flow: If the oil flow is weak, the oil filter may be clogged, or the oiler pump may be worn.
Excessive Oil Flow: While less common, excessive oil flow can indicate a problem with the oiler pump or a leak in the oil system.

Pro Tip for Oiling

I’ve found that a simple way to check if my chainsaw is oiling properly is to hold the running saw (with the chain brake engaged!) over a piece of cardboard. After a few seconds, you should see a line of oil being thrown off the chain. If not, it’s time to investigate.

Pro Fix #3: Combatting the Sawdust Menace

Sawdust is the inevitable byproduct of cutting wood, but it can quickly become a major headache if not managed properly. Sawdust buildup can clog the bar groove, impede chain movement, and contribute to chain lockup.

Understanding Sawdust’s Impact

Sawdust acts like an abrasive paste, increasing friction between the chain and bar. It also prevents the oil from reaching the cutting surfaces, further exacerbating the problem.

Cleaning the Bar Groove

Regular Cleaning: Clean the bar groove regularly, especially when cutting softwoods, which tend to produce more sawdust.
Tools for Cleaning: Use a bar groove cleaner, a screwdriver, or a piece of stiff wire to remove sawdust from the groove.
Compressed Air: Compressed air can be used to blow out sawdust from hard-to-reach areas.

Cleaning the Sprocket Area

Remove the Side Cover: Remove the side cover to access the sprocket area.
Brush Away Debris: Use a brush to remove sawdust and debris from around the sprocket.
Inspect the Sprocket: Check the sprocket for wear or damage. A worn sprocket can contribute to chain lockup.

Pro Tip for Sawdust Management

I always carry a small wire brush with me when I’m working in the woods. A quick brush of the bar groove and sprocket area every few hours can make a big difference in preventing sawdust buildup and ensuring smooth operation. I also make sure to blow out the area with compressed air after each day’s work.

Pro Fix #4: Inspecting and Maintaining the Chain and Bar

A damaged chain or bar can cause all sorts of problems, including chain lockup. Regular inspection and maintenance are essential for keeping your chainsaw running smoothly and safely.

Chain Inspection

Sharpness: Ensure the chain is sharp. A dull chain requires more force to cut, increasing the risk of kickback and chain lockup.
Damage: Inspect the chain for any signs of damage, such as broken or bent cutters, loose tie straps, or cracked drive links.
Wear: Check the chain for excessive wear. A worn chain will not cut efficiently and may be more prone to breakage.

Bar Inspection

Straightness: Ensure the bar is straight. A bent bar can cause the chain to bind.
Wear: Check the bar for wear, especially along the rails. Worn rails can cause the chain to derail and lock up.
Burrs: Remove any burrs or sharp edges from the bar rails using a file or a bar rail dresser.
Lubrication Holes: Ensure the lubrication holes in the bar are clear.

Chain Sharpening

File Size and Angle: Use the correct file size and angle for your chain type.
Consistent Strokes: Use consistent strokes when sharpening each cutter.
Depth Gauges: Check and adjust the depth gauges as needed.

Bar Maintenance

Bar Rail Dressing: Use a bar rail dresser to restore the rails to their original shape and remove any burrs or sharp edges.
Bar Rotation: Rotate the bar regularly to distribute wear evenly.

Pro Tip for Chain and Bar Care

I’ve found that investing in a good quality chain sharpener is well worth the money. It allows you to quickly and easily sharpen your chain in the field, ensuring that you’re always cutting with a sharp blade. I also make sure to rotate my bar every time I sharpen my chain to promote even wear.

Pro Fix #5: Troubleshooting Clutch Issues

The clutch is a critical component that connects the engine to the chain. A faulty clutch can prevent the chain from turning freely, leading to chain lockup.

Understanding the Clutch Mechanism

The clutch engages and disengages the chain based on engine speed. When the engine is idling, the clutch disengages, allowing the chain to remain stationary. As the engine speed increases, the clutch engages, transferring power to the chain.

Common Clutch Problems

Worn Clutch Shoes: Worn clutch shoes can slip, preventing the chain from engaging properly.
Broken Clutch Springs: Broken clutch springs can cause the clutch to engage prematurely or not at all.
Contamination: Oil, grease, or sawdust can contaminate the clutch, causing it to slip or bind.

Diagnosing Clutch Problems

Chain Creep: If the chain is moving when the engine is idling, the clutch may be engaging prematurely.
Slipping Clutch: If the chain is not turning at full speed when the engine is revving, the clutch may be slipping.
Chain Lockup: A seized or damaged clutch can prevent the chain from turning at all.

Repairing the Clutch

Cleaning: Clean the clutch with a solvent to remove any contamination.
Replacing Worn Parts: Replace worn clutch shoes or broken clutch springs.
Professional Repair: If you’re not comfortable working on the clutch, take the chainsaw to a qualified repair technician.

Pro Tip for Clutch Maintenance

I always make sure to keep the clutch area clean and free of debris. I also inspect the clutch shoes and springs regularly for wear or damage. If I notice any problems, I address them immediately to prevent further damage.

Deep Dive: Wood Anatomy and Chainsaw Performance

Understanding wood anatomy is surprisingly relevant to chainsaw performance and preventing chain lockup. The density, grain, and moisture content of the wood all impact how the chain cuts and how much stress is placed on the saw.

Hardwood vs. Softwood

Hardwoods: Generally denser and more difficult to cut than softwoods. They require a sharper chain and more power. Examples include oak, maple, and hickory.
Softwoods: Easier to cut but tend to produce more sawdust. Examples include pine, fir, and spruce.

Grain Direction

Cutting with the grain is generally easier than cutting against the grain. Cutting against the grain can cause the chain to bind and increase the risk of kickback.

Moisture Content

Green Wood: Wood with high moisture content is heavier and more difficult to cut. It also tends to clog the chain with wet sawdust.
Dry Wood: Dry wood is easier to cut but can be more brittle and prone to splintering.

Data Point: Moisture Content and Cutting Efficiency

Research shows that cutting green wood can reduce chainsaw efficiency by as much as 20% due to increased friction and sawdust buildup. Seasoning wood to a moisture content of 20% or less significantly improves cutting performance.

Logging Tool Selection and Maintenance Best Practices

Beyond the chainsaw itself, other logging tools play a crucial role in safe and efficient wood processing. Proper selection and maintenance of these tools are essential for preventing accidents and maximizing productivity.

Felling Axes and Wedges

Felling Axe: Used for felling trees. Choose an axe with the correct weight and handle length for your height and strength.
Felling Wedges: Used to prevent the tree from pinching the saw bar during felling.

Log Splitters

Manual Log Splitters: Suitable for splitting small to medium-sized logs.
Hydraulic Log Splitters: More powerful and efficient for splitting larger logs.

Measuring Tools

Measuring Tape: Used to measure log lengths.
Diameter Tape: Used to measure log diameters.

Safety Gear

Chainsaw Chaps: Protect your legs from chainsaw cuts.
Safety Glasses: Protect your eyes from flying debris.
Hearing Protection: Protect your ears from loud noise.
Gloves: Provide a secure grip and protect your hands.
Helmet: Protect your head from falling branches.

Maintenance Best Practices

Sharpening: Keep all cutting tools sharp. A dull tool requires more force and increases the risk of accidents.
Cleaning: Clean tools after each use to remove dirt, sawdust, and sap.
Lubrication: Lubricate moving parts to prevent rust and corrosion.
Storage: Store tools in a dry place to prevent rust and damage.

Firewood Seasoning Techniques and Safety Considerations

Properly seasoned firewood burns hotter, cleaner, and more efficiently. Understanding the principles of firewood seasoning is essential for maximizing its fuel value and minimizing smoke emissions.

The Seasoning Process

Seasoning involves reducing the moisture content of the wood to around 20% or less. This can be achieved through natural air drying or kiln drying.

Air Drying

Stacking: Stack the firewood in a single row, off the ground, with good air circulation.
Location: Choose a sunny, windy location for stacking the firewood.
Covering: Cover the top of the stack to protect it from rain and snow.
Time: Air drying typically takes 6-12 months, depending on the climate and wood species.

Kiln Drying

Faster Drying: Kiln drying is a faster process that can reduce the moisture content of the wood in a matter of days.
Higher Cost: Kiln drying is more expensive than air drying.
Consistency: Kiln-dried firewood has a more consistent moisture content than air-dried firewood.

Safety Considerations

Stacking Stability: Stack firewood in a stable manner to prevent it from collapsing.
Pest Control: Take measures to prevent pests from infesting the firewood.
Fire Safety: Store firewood away from buildings and flammable materials.

Data Point: Fuel Value Ratings

Research indicates that properly seasoned hardwood can have a fuel value rating of up to 20 million BTUs per cord, compared to only 10-12 million BTUs per cord for green wood.

Project Planning and Execution

Effective project planning is crucial for successful wood processing and firewood preparation. A well-defined plan can help you stay organized, efficient, and safe.

Define Your Goals

What are you trying to achieve? Are you clearing land, preparing firewood for the winter, or building a log cabin?
What is your budget? How much money are you willing to spend on equipment, materials, and labor?
What is your timeline? How long will the project take to complete?

Assess Your Resources

Equipment: Do you have the necessary tools and equipment?
Materials: Do you have enough wood, oil, and other supplies?
Labor: Do you have enough help?
Skills: Do you have the necessary skills and experience?

Develop a Plan

Break down the project into smaller tasks.
Assign tasks to individuals.
Set deadlines for each task.
Create a budget for each task.
Identify potential risks and develop mitigation strategies.

Execute the Plan

Follow the plan closely.
Monitor progress regularly.
Make adjustments as needed.
Communicate effectively with team members.
Prioritize safety at all times.

Case Study: Firewood Preparation Project

I once undertook a project to prepare 10 cords of firewood for the winter. I started by defining my goals, assessing my resources, and developing a detailed plan. I broke the project down into smaller tasks, such as felling trees, bucking logs, splitting wood, and stacking firewood. I assigned tasks to myself and a few helpers, set deadlines for each task, and created a budget. I followed the plan closely, monitored progress regularly, and made adjustments as needed. By prioritizing safety and working efficiently, I was able to complete the project on time and within budget.

Conclusion: Mastering the Chainsaw and the Wood

Chain lockup on a Husqvarna 137 chainsaw is a common issue, but it’s one that can be easily prevented with proper maintenance and troubleshooting. By mastering the art of chain tensioning, ensuring adequate lubrication, combating sawdust buildup, inspecting and maintaining the chain and bar, and troubleshooting clutch issues, you can keep your chainsaw running smoothly and efficiently.

Remember, understanding wood anatomy, selecting and maintaining logging tools, and practicing safe firewood seasoning techniques are all essential for successful wood processing. Plan your projects carefully, prioritize safety, and always be prepared to adapt to changing conditions.

So, the next time your Husqvarna 137 chain locks up, don’t despair. Take a deep breath, follow these pro fixes, and get back to cutting. And remember, the journey of a thousand cords begins with a single saw, properly maintained and ready to work. Now, go out there and make some firewood!