Bolens BL110 User Manual: A Comprehensive Guide
This comprehensive guide provides detailed instructions for the Bolens BL110 trimmer, covering assembly, operation, maintenance, and troubleshooting – downloadable resources are readily available online!
The Bolens BL110 is a 25-cc 2-Cycle 16-in Curved Shaft Gas String Trimmer designed for efficient and reliable yard maintenance. This user manual serves as a vital resource, guiding you through every aspect of owning and operating your new trimmer. Whether you’re a seasoned homeowner or new to landscaping, understanding your BL110 is crucial for optimal performance and longevity.
This manual details the trimmer’s components, safe operating procedures, assembly steps, and routine maintenance tasks. You’ll find clear instructions on starting the engine, effective trimming techniques, and how to adjust the cutting height for various terrains. Furthermore, it provides valuable troubleshooting advice to address common issues you might encounter.
Accessing online resources, such as those found on the Internet Archive and Manualzz, can supplement this guide with downloadable PDFs and additional support. Proper use and care, as outlined within, will ensure years of dependable service from your Bolens BL110.
Safety Precautions
Prioritizing safety is paramount when operating the Bolens BL110. Always wear appropriate personal protective equipment (PPE), including eye protection, hearing protection, long pants, and sturdy footwear. Never operate the trimmer with missing or damaged guards. Before each use, inspect the trimmer for loose parts or damage.
Ensure the work area is clear of obstacles and bystanders, maintaining a safe operating distance. Be mindful of potential hazards like hidden objects or uneven terrain. Never operate the trimmer while fatigued or under the influence of drugs or alcohol.
Fuel handling requires extreme caution; refuel only when the engine is cool and in a well-ventilated area. Avoid smoking or open flames near fuel. Disconnect the spark plug wire before performing any maintenance. Always refer to the complete user manual for a comprehensive list of safety guidelines and warnings to prevent injury.
Unboxing and Parts Identification
Upon receiving your Bolens BL110, carefully inspect the packaging for any signs of damage during shipping. Once opened, verify that all components are present. Key parts include the trimmer shaft, handle (upper and lower), cutting head assembly, guard, and fuel tank.
Familiarize yourself with each component before assembly. The manual provides a detailed parts diagram illustrating the location and function of each item. Identify the engine housing, starter assembly, and throttle control.
Check for any missing hardware, such as screws, bolts, or nuts. Retain all packaging materials and the user manual for future reference. Proper identification of parts is crucial for correct assembly and safe operation of your new Bolens BL110 trimmer.

Assembly Instructions
Follow these steps to correctly assemble your Bolens BL110 trimmer, ensuring secure connections for optimal performance and safe operation – refer to diagrams!
Attaching the Handle
Begin by carefully unpacking the handle components and identifying the upper and lower handle pieces. Align the lower handle with the trimmer shaft, ensuring the mounting holes are correctly positioned. Secure the lower handle using the provided bolts and washers, tightening them firmly with the appropriate tools – do not overtighten.
Next, attach the upper handle to the lower handle, again aligning the mounting points. Use the remaining bolts and washers to fasten the upper handle securely. Ensure a comfortable grip and ergonomic positioning for optimal control during operation. Double-check all connections to guarantee stability and prevent loosening during use. A properly attached handle is crucial for safe and efficient trimming.
Refer to the parts diagram if you encounter any difficulties during this process.
Connecting the Shaft
Carefully align the curved shaft with the engine housing, ensuring the drive cable is routed correctly through the designated channel. Insert the shaft into the engine housing until it clicks securely into place – a proper connection is vital for power transfer. Verify the shaft’s stability by gently attempting to rotate it; it should be firmly fixed.
Inspect the drive cable for any kinks or obstructions that might impede its movement. Secure the shaft with the provided clamp or locking mechanism, tightening it according to the manufacturer’s specifications. A loose connection can lead to operational issues and potential damage. Ensure the shaft rotates freely without binding or resistance.
Consult the parts diagram for visual guidance if needed, and double-check all connections before proceeding.
Installing the Cutting Head
Begin by ensuring the engine is switched off and the spark plug is disconnected for safety. Locate the cutting head attachment point on the end of the trimmer shaft. Align the cutting head with the shaft, carefully matching any designated notches or grooves.
Push the cutting head firmly onto the shaft until it clicks or locks into position – a secure attachment is crucial for safe operation. Check for proper alignment and ensure the head rotates freely. Install the spool and line according to the trimmer’s specific instructions, ensuring correct line feeding.
Tighten any retaining knobs or screws to further secure the cutting head. Always test the line feed mechanism before starting the engine.
Fueling the Trimmer
Before fueling, always ensure the engine is completely cool and switched off, and work in a well-ventilated area, away from open flames or sparks. Identify the fuel tank, typically located on the side of the engine. Use a fuel mixture of regular unleaded gasoline and a high-quality 2-cycle engine oil, adhering to the ratio specified in the manual – usually 50:1.
Carefully pour the fuel mixture into the tank, using a funnel to avoid spills. Do not overfill; leave some space for expansion. Securely tighten the fuel cap to prevent leaks during operation. Wipe up any spilled fuel immediately with a clean cloth.
Always check fuel levels before each use and replenish as needed.

Operation Instructions
Proper operation of your Bolens BL110 involves starting the engine, employing effective trimming techniques, and adjusting the cutting height for optimal results.
Starting the Engine
Before attempting to start your Bolens BL110, ensure the trimmer is placed on a flat, stable surface, clear of any obstructions. Prime the engine by pressing the primer bulb several times until fuel is visible within it – typically 6-10 pumps are sufficient.
Set the choke to the ‘start’ position; this enriches the fuel mixture for easier ignition, especially in colder conditions. Grip the starter handle firmly and pull the cord with a smooth, controlled motion. Avoid jerking the cord, as this can damage the starter mechanism.

Repeat the pulling motion until the engine sputters and attempts to start. Once it fires, gradually release the choke, allowing the engine to warm up. If the engine fails to start after several attempts, consult the troubleshooting section of this manual for further assistance.
Trimming Techniques
For optimal trimming, maintain a slight angle when approaching stems and thicker vegetation. Avoid forcing the trimmer line into dense growth, as this can cause it to break or bog down the engine. Utilize a sweeping, side-to-side motion for efficient cutting, overlapping each pass slightly to prevent uncut patches.
When trimming around obstacles like trees or fences, exercise caution to prevent damage to both the trimmer and the surrounding objects. Keep the cutting head at a safe distance and adjust your technique accordingly. For edging along sidewalks or driveways, rotate the trimmer head to a vertical position and carefully follow the edge.
Regularly inspect the trimmer line and replace it as needed to maintain peak performance. Always wear appropriate safety gear, including eye protection, during operation.

Adjusting the Cutting Height
The Bolens BL110 typically doesn’t feature adjustable cutting heights in the traditional sense, relying instead on operator technique and trimming angle. However, line length significantly impacts the effective cutting radius. Extending the trimmer line increases the reach and allows for cutting taller grass or weeds, while a shorter line is better suited for precise edging.
To effectively “adjust” height, vary your stance and the angle at which you present the cutting head to the vegetation. A lower angle cuts closer to the ground, while a higher angle is ideal for reaching further. Regularly feeding new line ensures consistent cutting performance and maintains the desired reach.
Always prioritize safety and avoid overextending the line, as this can reduce control and increase the risk of breakage.

Maintenance and Care
Regular maintenance ensures optimal performance and extends the life of your Bolens BL110 trimmer; focus on air filter cleaning, spark plug checks, and fuel system upkeep!
Air Filter Cleaning
Maintaining a clean air filter is crucial for ensuring optimal engine performance and preventing damage. A dirty air filter restricts airflow, leading to reduced power and increased fuel consumption. Inspect the air filter regularly, ideally after every five hours of use, or more frequently in dusty conditions.
To clean the air filter, carefully remove it from the air filter housing. Gently tap the filter to remove loose debris. If the filter is particularly dirty, wash it in warm, soapy water. Rinse thoroughly and allow it to dry completely before reinstalling.
For foam filters, apply a small amount of air filter oil after washing and drying to improve filtration. Replace the air filter if it is damaged or cannot be adequately cleaned. A clean air filter contributes significantly to the longevity and efficiency of your Bolens BL110 trimmer.
Spark Plug Replacement
Regular spark plug replacement is essential for maintaining consistent engine ignition and performance. A worn or fouled spark plug can cause starting difficulties, misfires, and reduced power. Inspect the spark plug periodically, typically after every 100 hours of operation, or annually.
To replace the spark plug, disconnect the spark plug wire and carefully remove the old plug using a spark plug wrench. Check the gap of the new spark plug against the specification in your owner’s manual – typically around 0.030 inches. Adjust the gap if necessary using a spark plug gapping tool.
Install the new spark plug, tightening it to the specified torque. Reconnect the spark plug wire securely. Replacing the spark plug proactively ensures reliable starting and optimal engine function for your Bolens BL110 trimmer.
Fuel System Maintenance
Maintaining a clean fuel system is crucial for the reliable operation of your Bolens BL110 trimmer. Use fresh fuel, ideally mixed with a high-quality 2-cycle oil, and avoid fuel containing ethanol, which can damage components. Always drain the fuel tank before extended storage periods to prevent fuel degradation and carburetor issues.
Periodically inspect the fuel lines for cracks or leaks, replacing them as needed. Clean or replace the fuel filter regularly to prevent debris from clogging the carburetor. Consider using a fuel stabilizer to extend the life of the fuel and prevent varnish buildup.
Proper fuel system maintenance ensures consistent fuel delivery, easy starting, and optimal engine performance, extending the life of your Bolens BL110 trimmer.
Gear Case Lubrication
Proper lubrication of the gear case is vital for smooth operation and longevity of your Bolens BL110’s drive system. Use only a high-quality, specifically formulated gear oil – do not substitute with automotive or other types of oil. Check the gear case oil level periodically, typically after every 25 hours of use, or annually.
To check the level, locate the fill plug and remove it. If the oil level is low, carefully add oil until it reaches the bottom of the fill hole. Avoid overfilling, as this can cause leaks and damage. Inspect the gear case for any signs of leaks or damage during lubrication.
Regular gear case lubrication minimizes friction, reduces wear, and ensures efficient power transfer, keeping your Bolens BL110 running smoothly.

Troubleshooting Common Issues
This section details solutions for typical problems with the Bolens BL110, including engine starting failures, trimmer line difficulties, and excessive vibration concerns.
Engine Won’t Start
If your Bolens BL110 engine fails to start, several factors could be at play. First, ensure the fuel tank contains a fresh fuel mixture, properly blended with the correct oil ratio for a 2-cycle engine. A stale or improperly mixed fuel can prevent ignition.
Next, check the spark plug. Remove it and inspect for fouling – carbon buildup or wetness. Clean or replace the spark plug as needed. Verify the spark plug wire is securely connected. Also, confirm the choke is engaged during cold starts and disengaged once the engine attempts to run.
Inspect the air filter; a clogged air filter restricts airflow, hindering starting. Ensure the fuel line isn’t kinked or blocked, preventing fuel delivery. Finally, verify the ignition switch is functioning correctly. If issues persist, consult a qualified technician.
Trimmer Line Issues
Experiencing problems with the trimmer line on your Bolens BL110? Several common issues can occur. Line breakage is frequent, often due to hitting hard surfaces. Use the correct diameter line specified in the manual to minimize this. Ensure the line is loaded correctly into the spool, winding it neatly and evenly.
If the line won’t advance, check for tangled line within the spool. Disassemble the spool and rewind the line, ensuring it feeds smoothly through the eyelets. Inspect the eyelets for wear or damage; replace them if necessary. Verify the bump feed mechanism is functioning correctly.
A jammed spool can also prevent line advancement. Carefully remove the spool and clear any obstructions. Regularly inspect and replace the trimmer head components as needed for optimal performance.

Vibration Problems
Excessive vibration during operation of your Bolens BL110 can indicate several potential issues. First, ensure all components are securely fastened – check the handle, shaft connections, and cutting head. Loose parts are a primary cause of unwanted vibration. Inspect the trimmer head for damage; a bent or unbalanced head will transmit vibrations.
Worn engine mounts can also contribute to vibration. Examine the mounts for cracks or deterioration and replace them if necessary. Ensure the spark plug is properly tightened, as a loose spark plug can cause engine imbalance. Check the blade or cutting head for damage; an unevenly worn head will cause vibration.
If vibration persists, discontinue use and consult a qualified service technician. Ignoring excessive vibration can lead to further damage and potential injury.

Parts Diagram & Replacement
Locate specific components using detailed diagrams and easily order replacements online or through authorized Bolens dealers, ensuring your BL110’s longevity and performance.
Locating Parts
Identifying the correct part for your Bolens BL110 trimmer is crucial for successful repairs and maintenance. Begin by consulting the detailed parts diagram included within this manual, or accessible through online resources like the Internet Archive and Manualzz. These diagrams visually break down the trimmer into its individual components, labeled with specific part numbers.
Carefully compare the part you need to replace with the illustrations in the diagram. Pay close attention to the shape, size, and any unique features. Once you’ve identified the correct part number, you can use it to search for replacements. Online retailers specializing in outdoor power equipment parts often have searchable databases. Alternatively, your local Bolens dealer can assist you in locating the necessary components. Remember to have your trimmer’s model number (BL110) readily available when ordering to ensure compatibility.
Utilizing the manual and available online resources will streamline the process of finding the right parts, minimizing downtime and maximizing the lifespan of your Bolens BL110.
Ordering Replacement Parts
Once you’ve identified the necessary part number from the parts diagram, several avenues exist for ordering replacements for your Bolens BL110 trimmer. Authorized Bolens dealers are a reliable source, offering genuine parts and expert advice. They can often assist with locating hard-to-find items and ensuring compatibility.
Numerous online retailers specialize in outdoor power equipment parts, providing a convenient alternative. Websites like Manualzz and the Internet Archive often link to suppliers. When ordering online, verify the retailer’s reputation and return policy. Always double-check the part number before finalizing your purchase to avoid errors.
Provide your trimmer’s model number (BL110) during the ordering process. Shipping costs and delivery times will vary depending on the retailer and your location. Keep your proof of purchase for warranty purposes and potential returns.

Warranty Information
Bolens provides a warranty on the BL110 trimmer, protecting against defects in materials and workmanship. The warranty period typically begins on the date of original purchase. Carefully review the warranty statement included with your trimmer for specific details regarding coverage duration and limitations.
Generally, the warranty covers defects that arise during normal use. It does not cover damage resulting from misuse, abuse, improper maintenance, or unauthorized repairs. Keep your original purchase receipt as proof of purchase, as it is required for all warranty claims.
To initiate a warranty claim, contact an authorized Bolens service center. They will assess the issue and determine if it is covered under warranty. Transportation costs to and from the service center are typically the responsibility of the owner.