The Troy-Bilt TB51BP string trimmer is known for its curved shaft and reliable performance. If you own one, you know it’s a workhorse for lawn edges and tough weeds. This guide covers everything you need to operate, maintain, and troubleshoot your trimmer effectively.
We will walk you through its key features, starting procedures, and essential maintenance. You’ll also find tips for common problems and accessory recommendations. Let’s get your trimmer working its best.
Troy Bilt Tb51bp
The TB51BP is a gas-powered curved-shaft trimmer designed for residential use. Its design reduces fatigue, making it easier to handle for longer periods. It balances power and maneuverability well for typical yard tasks.
Understanding its core components helps with operation and care. Here’s a breakdown of what makes this model tick.
Key Features And Specifications
This trimmer comes with a set of features that define its capability. Knowing these specs helps you compare and use it correctly.
Engine And Power Source
At its heart is a 51cc 2-cycle gasoline engine. This engine requires a fuel mix of gasoline and 2-cycle oil. The exact ratio is crucial, typically 40:1, so always check your manual.
- Engine Displacement: 51 cubic centimeters (cc)
- Engine Type: 2-cycle, air-cooled
- Fuel: Gasoline and 2-cycle oil mix
- Starting System: Spring-assisted pull start
Shaft And Handle Design
The curved shaft is a signature feature. It provides better balance and reach under obstacles like fences. The handle is adjustable to suit different user heights and preferences.
- Shaft Type: Curved, steel
- Drive System: Flexible drive shaft
- Handle: D-loop, adjustable
- Weight: Approximately 13.5 pounds (without fuel)
Cutting System And Swath
It uses a dual-line bump-feed head for cutting. The cutting swath, or width, is 17 inches. This allows you to cover more area with each pass.
- Cutting Swath: 17 inches
- Line Feed: Bump-and-feed head
- Line Diameter: Uses .095 inch trimmer line
Unboxing And Initial Setup
When you first get your TB51BP, some assembly is required. Follow these steps carefully to ensure a safe and proper setup.
- Open the box and remove all parts. Lay them on a clear, flat surface.
- Attach the shaft to the engine housing. This usually involves aligning and tightening a couple of bolts securely.
- Install the handle onto the shaft. Adjust it to a comfortable position before tightening all clamps.
- Mount the cutting head guard. This safty feature is essential for deflecting debris.
- Fill the fuel tank with the correct gasoline and oil mixture. Do not use straight gasoline.
Remember to read the included manual for any model-specific instructions. Double-check all connections before starting the engine for the first time.
How To Start Your Troy Bilt TB51BP
Starting a gas trimmer has a specific sequence. Doing it correctly prevents flooding and makes starting easier.
- Place the trimmer on a flat, clear surface. Ensure the cutting head is not touching anything.
- Press the primer bulb 5 to 7 times. This draws fuel into the carburetor.
- Set the engine choke to the “Full” or “Start” position. This is usally a lever near the primer.
- Hold the throttle trigger lockout and the throttle trigger together. Keep them held.
- Pull the starter rope briskly until the engine attempts to start. This may take 2-4 pulls.
- Once it sputters, move the choke lever to the “Half” or “Run” position.
- Pull the starter rope again. The engine should now start and run.
- Allow the engine to warm up for about 30 seconds before beginning to trim.
If the engine does not start, wait a minute and repeat from step 2. Avoid over-priming, as this floods the engine.
Operating Techniques For Best Results
Using the right technique improves cut quality and reduces strain. It also extends the life of your trimmer line and engine.
Basic Trimming Motion
Hold the trimmer so the cutting head is parallel to the ground. Use a smooth, sweeping motion from side to side. Let the tip of the line do the cutting for maximum efficiency.
- Keep the head level for an even cut.
- Move slowly, allowing the line to cut through grass and weeds.
- Overlap each pass slightly for complete coverage.
Edging Along Walkways
Tilt the trimmer so the cutting head is nearly vertical. Gently guide it along the edge of sidewalks or driveways. This creates a clean, defined edge between your lawn and hardscapes.
Managing Tough Weeds And Overgrowth
For thick patches, use a slow, deliberate side-to-side motion. You may need to make multiple passes. For very heavy growth, consider using a optional brush blade attachment.
Routine Maintenance Schedule
Regular maintenance keeps your Troy-Bilt TB51BP running smoothly for years. Neglect can lead to poor performance and costly repairs.
Before Each Use (Pre-Operation Checks)
- Check the fuel level and mix fresh fuel if needed.
- Inspect the trimmer line for wear and replace if short.
- Look for loose bolts, nuts, or screws and tighten them.
- Ensure the cutting head guard is securely attached.
After Each Use
- Wipe down the exterior to remove grass clippings and dirt.
- Check the air filter for debris and clean it if necessary.
Monthly Or Seasonal Maintenance
- Clean or replace the air filter element.
- Inspect the spark plug and clean or gap it.
- Check the fuel filter inside the tank.
- Lubricate the drive shaft if your manual recommends it.
End-Of-Season Storage
Proper storage is critical for gas equipment. Always prepare your trimmer for long periods of inactivity.
- Drain all fuel from the tank and carburetor. Run the engine until it stops.
- Remove the spark plug and add a teaspoon of oil into the cylinder. Pull the starter cord slowly to coat the interior, then reinstall the plug.
- Clean the entire unit thoroughly, including the cooling fins.
- Store the trimmer in a cool, dry place, preferably covered.
Common Troubleshooting And Repairs
Even reliable trimmers can have issues. Here are common problems with the TB51BP and how to fix them.
Engine Won’t Start
This is the most frequent issue. Work through this checklist.
- Check Fuel: Is there fresh, properly mixed fuel in the tank? Old fuel is a common culprit.
- Check Spark: Remove the spark plug, reconnect it to the wire, and ground it against the engine. Pull the starter to see if it sparks. If not, replace the plug.
- Check Airflow: A dirty air filter can prevent starting. Clean or replace it.
- Check Primer: Ensure the primer bulb is moving fuel. Look for cracks or leaks.
Engine Starts But Dies
If the engine starts but then stalls, consider these causes.
- Clogged Fuel Filter: The filter in the fuel tank may be dirty, restricting fuel flow.
- Carburetor Issues: The carburetor jets might be clogged with old fuel residue. It may need cleaning.
- Faulty Fuel Cap Vent: The gas cap has a small vent that can get blocked. Try loosening the cap slightly when running.
Trimmer Line Won’t Feed
If bumping the head doesn’t release new line, follow these steps.
- Turn off the engine and disconnect the spark plug wire for safety.
- Remove the cutting head spool. Check for tangled or jammed line.
- Clean out any debris inside the spool housing.
- Rewind the spool with new line, following the directional arrows precisely.
- Reassemble, ensuring the spring inside is correctly positioned.
Always use the recommended .095 inch diameter line for proper feeding. Using line that is to thick can cause jams.
Recommended Accessories And Attachments
You can enhance your trimmer’s versatility with official attachments. The TB51BP uses the “Attach-A-Matic” system for easy changes.
- Brush Blade: Converts the trimmer into a brush cutter for saplings and thick brush.
- Blade Edger: A dedicated wheeled edger attachment for perfect edges along walkways.
- Bump Feed Head Replacement: Having a spare pre-wound head saves time during yard work.
- Shoulder Strap: A comfort strap distributes weight and reduces arm fatigue.
Ensure any attachment is compatible with your specific model year before purchasing. They can significantly expand your tool’s usefulness.
Safety Precautions You Must Follow
Gas-powered trimmers are powerful tools that demand respect. Ignoring safety can lead to serious injury.
- Always wear safety glasses or goggles to protect your eyes from flying debris.
- Wear long pants, closed-toe shoes, and hearing protection.
- Clear the work area of stones, sticks, wire, and other objects that could be thrown.
- Keep bystanders, especially children and pets, at a safe distance.
- Never operate the trimmer near flammable materials or in wet conditions.
- Always turn off the engine and let it cool before performing any maintenance or clearing a jam.
Your user manual contains a complete list of safety warnings. Review it regularly to stay safe.
Frequently Asked Questions
Here are answers to some of the most common questions about the Troy-Bilt TB51BP.
What is the correct fuel mix for the TB51BP?
The Troy-Bilt TB51BP requires a 40:1 gasoline to 2-cycle oil mixture. Use high-quality 89-octane gasoline and a good JASO FD-rated 2-cycle oil. Always mix fuel in a clean, approved container before pouring it into the trimmer.
How do I replace the trimmer line on my Troy Bilt?
First, remove the spool from the cutting head. Take out any old line remnants. Cut about 20 feet of .095 inch line. Find the anchor holes in the spool and feed the line through, winding it tightly in the direction indicated by the arrows. Leave about 6 inches of line loose, then secure the ends in the notches. Reassemble the spool into the head.
Can I use a different size trimmer line?
It is not recommended. The Troy-Bilt TB51BP is designed for .095 inch line. Using a thicker line can cause feeding problems and strain the engine. Using a thinner line may break too easily and not provide adequate cutting power.
Why does my trimmer vibrate excessively?
Excessive vibration often indicates an unbalanced cutting head or a bent drive shaft. Check that the spool is wound evenly and installed correctly. If the vibration persists, inspect the shaft for damage. A loose engine mount or internal component could also be the cause, which may require professional service.
Where can I find a manual for the Troy-Bilt TB51BP?
You can download the official operator’s manual from the Troy-Bilt website. Enter your model number (TB51BP) in the support section. You can also contact Troy-Bilt customer service for assistance if you cannot find it online. Keeping a digital or printed copy is very helpfull for reference.