Weed eater shaft repair

Weed eater shaft repair DEFAULT

It’s frustrating when you need to use your gas string trimmer and the head will not turn.

Most every string trimmer uses a centrifugal clutch that unfastens the engine flywheel from its drive shaft when you turn off the motor. When the clutch springs eventually wear out,  the clutch is not going to retract when the drive shaft stops spinning. This can lead to excessive clutch wear.

After enough wear, the clutch will begin to slip.  This is when you really begin to notice problems because the the head is not going to spin in any way. If this ends up being your problem, you’ll need to decide if you want to replace the clutch – or the whole weed eater.  If it is an older model, you are problem better off to replace the tool with a new string trimmer.

Drive Shafts

Quick Fixes

Before breaking out your pocketbook for pricey repairs or a brand new tool, it’s first worth checking to see if you are having any of these problems.

First, you might have gathered enough weeds and other debris over the years that’s it’s wrapped so tightly around the eater head it can’t move.  To check, you’ll want to pop the head off of the tool and cut off any organic or other material that has built up on the shaft.

Another possibility is that there is something stopping the engine from powering up enough to spin the eater head. This may well be due to the air filter or spark arrestor being blocked. Each of the parts is easily replaced. Your owners manual will have the exact location of these parts on your tool.  Usually it includes directions for replacing them as well.

Quick Fixes for Weed Eater

Drive Shaft Breaks Down

The drive shaft of most straight and every curved-shaft Weed Eater trimmer is a supple rod that hooks the motor up with the trimmer head. This rod that can break.  When this happens the only option is to get it replaced. There is a centrifugal clutch that hooks the drive shaft up with the motor. This clutch retracts whenever the motor isn’t operative, but on the engine accelerating, centrifugal force shifts it downward the engine crankshaft till it gets engaged with drive shaft. Sometime the clutch sticks in the inoperative position, which is typically due to the buildup of dirt and wearof the engine housing.

The Steps to Follow for Servicing the Drive Shaft or Clutch Are Given below

  • While these directions should work for most weed eaters, each model is slightly different.  You’ll need to improvise to make these directions work with your own model.  The owners manual will be a big help in this regard.  If there is a conflict between our directions and what your owners manual says – go with your manual.  It’s made for your specific situation.

    Step 1

    Put the trimmer on a surface that is flat, and allow the engine to cool down for a period of 10 – 15 minutes so you don’t burn yourself. Make sure the engine can’t accidentally start again . Removing the spark plug wire is the easiest way to immobilize the engine.

    Step 2

    Remove the screws that hold the handle housing to drive shaft by using a screwdriver, force open the couple of parts of the handle and slot out the throttle lever from handle. Try and drag the throttle cable from the lever by the use of needle-nose pliers, and follow this up by removing the handle housing.

    Step 3

    Unscrew the screw the juncture where the drive shaft and the engine housing meet. Drag the drive shaft and free it from engine housing.

    Step 4

    The next thing to be done is unscrewing the clutch cover of plastic from the face of the engine housing. This should reveal the clutch assembly.

    Step 5

    Unscrew the bolt that holds the clutch housing and the engine crankshaft together by the use of a socket wrench. Drag this thing off for revealing the clutch plate. Unbolt the screws that hold the clutch plate and the flywheel together and do away with it. Substitute the plate as well as the housing.

    Step 6

    Assemble the new clutch by reversing the directions you used for removing the broken one. Once the clutch is secure, put back the clutch lid, put the drive shaft back in place and make certain that it seats appropriately. Follow this up by replacing the retaining screw. Attach the throttle cable to throttle lever, hook the lever up with the drive shaft and substitute the handle housing.

    Things That You Are Going to Require

    • Needle-nose pliers
    • Screwdriver
    • Socket wrench
    • Paitence – don’t try this without it

    Bottom Line

    You could require needle-nose pliers for extracting the drive shaft from shaft housing. It has a plastic coating – even on the wound metallic part -so when it breaks it is going to come out in a single piece. Seek advice from our website, any repair service online or a neighboring outlet for the appropriate substitution for the model you own.

Sours: https://www.backyardworkshop.com/the-reasons-behind-a-gas-weed-eater-not-spinning/

How to Replace the Drive Shaft on a String Trimmer

A string trimmer drive shaft is one of those parts that simply wears out over time. If it becomes too worn or breaks, you will need to replace it. And this article will help you do just that. 

We used an Echo trimmer for this repair, but the steps will be similar for most other trimmer models. 
Remember to use our string trimmer parts finder to find the right flexible drive shaft for your trimmer.    Removing the Drive Shaft

1. Loosen the shaft screws

Loosen the two screws that fasten the shaft assembly to the engine assembly. 

2. Remove the air filter

Remove the air filter cover and the air filter. 

3. Remove the throttle cable

With the filter assembly removed, you will have access to the throttle cable. Loosen the throttle cable tensioning nut.

Then remove the throttle cable from the trimmer body.

4. Remove the ignition wires

Carefully pull the ignition wires away from the unit. You can use a couple pair of pliers to disconnect them. 

5. Remove the shaft housing

With everything disconnected you can remove the shaft assembly from the engine assembly. 

6. Remove the drive shaft

Then just use your needle-nose pliers to pull the flexible shaft from the housing.

[Back to Top]   Installing the New Drive Shaft

1. Lubricate the drive shaft

Use a small amount of grease to lubricate the flexible drive shaft. 

2. Install the new drive shaft

Then slide it into the drive shaft housing. The flexible shaft needs to connect with a coupling inside the housing. Twist the flexible shaft around until it slides in and is flush with the metal housing. 

3. Re-install the shaft housing

Slide the shaft assembly back into engine assembly and secure it with the two bolts. 

4. Re-install the throttle cable and ignition wires

Connect the throttle, then tighten the throttle nut. 

Reconnect the ignition wires. 

5. Re-install the air filter assembly

Replace the air filter and secure the cover to finalize the repair.

[Back to Top]   ConclusionAnd that's how you can replace the flexible drive shaft in a string trimmer. This simple repair will save you loads of money compared to a repair shop.    Remember to check out our lawn equipment parts page to find the right parts for your trimmer and other lawn equipment.    [Back to Top]What We're About  

Sours: https://www.ereplacementparts.com/
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How to Replace a Broken Shaft on a Stihl Line Trimmer

By Chris Deziel

If your Stihl trimmer is hard to control, the shaft may need replacing.

Stihl line trimmers -- there are over 25 models for commercial and residential use -- all have a flexible shaft, whether or not the drive tube is curved or straight. This shaft can wear out after many hours of service, and you'll need to replace it. The main symptoms of a broken shaft are noise, vibrations in the drive tube and a head that spins intermittently or not at all. A bad clutch can also cause some of these symptoms, but if an examination of the flexible shaft reveals that it has turned blue, the shaft is faulty.

Access the shaft by pulling it out from the end of the trimmer's drive tube. To do this, you need to remove the cutting head. Start by removing the spark plug wire, and then lay the tool on a table or other flat surface.

Turn the cutting head until the hole behind the deflector lines up with the one in the thrust plate and you can push a locking pin through them. If you don't have the locking pin that came with the trimmer, use a 1/4-inch hex wrench instead. This prevents the shaft from turning, so you can remove the head.

Unscrew the head or the retaining nut that holds the head counterclockwise to remove it. Once the head is off, you can remove the locking pin.

Remove the thrust plate by pulling it off. Release the clamp on the deflector, and pull the deflector off the shaft. Release the clamp holding the gear housing to the shaft, and loosen the fixing screw with a screwdriver to pull off the gear housing and expose the end of the flexible shaft. Grasp the flexible shaft with adjustable pliers and pull it out of the drive tube.

Coat the new shaft with lubricating grease and insert it into the drive tube. Push it until it stops, and then use the pliers to rotate it until it locks into the clutch and you can push it still more. When the shaft is fully seated in the clutch, only inches should extend beyond the end of the drive tube.

Slide on the gear housing; clamp it and tighten the fixing screw. Replace the deflector and clamp it, and slide on the thrust plate. Insert the locking pin to block the shaft. Then screw on the cutting head, turning it clockwise to tighten it.




  • If the trimmer continues to vibrate and make noise after you replace the drive shaft, the clutch probably needs servicing. Access it by removing the drive tube from the engine housing.

Writer Bio

Chris Deziel has a bachelor's degree in physics and a master's degree in humanities. Besides having an abiding interest in popular science, Deziel has been active in the building and home design trades since As a landscape builder, he helped establish two gardening companies.

Sours: https://homeguides.sfgate.com/replace-broken-shaft-stihl-line-trimmerhtml
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