I need to take the string trimmer head off of the curved shaft on a model tb 525 ec.

the drive shaft is a cable that runs from the engine down to the cutting head through the aluminum tube.

Disconnect the two halves of the shaft. It should be pretty easy. Inspect the drive cable to make sure it hasnt snapped. Also make sure the cable is inserted into the female half. Its a square shaped cable that spins and drives the string trimmer head.

Contact the consumer desk.

TB22 EC Curved Shaft String Trimmer by Troy-Bilt

www.troybilt.com/.../troybilt/TB22EC-trimmer

Troy?Bilt Products
Rating: 3.7 - ‎232 votes - ‎$99.99 - ‎In stock
25cc, 2-Cycle Gas Trimmer / Attachment-Capable Design ... The TB22 EC gas string trimmer is both JumpStart™ and TrimmerPlus® attachment capable, making ...

Gas Trimmer ' TB635 4-Cycle Curved Shaft ... - Troy-Bilt

www.troybilt.com/.../troybilt/tb35-ec-curve-shaft-gas-...

Troy?Bilt Products
Rating: 3.3 - ‎32 votes - ‎$179.99 - ‎In stock
The TB635 EC curved shaft gas trimmer with SpringAssist™ technology features the new Click N Trim™ bump head, making line replacement easier than ever. ..... next one they put on - will only run for about 4 seconds. they've had for about 2 ... Both String Trimmer and Edger work great, easy to start and very low vibration.

Bushing is worn out. You will need to replace the shaft. Fairly inexpensive.

There is a cable that runs from the motor to the trimmer head check that. Remove trimmer b.y removing small screw at the base of trimmer head

Remove air filter than remove two 8mm nuts wala

the bolt on the end has left hand threads not right hand the most bolts have

Turn the bump knob clockwise to loosen on my tb490bc.

On the bump mechanism, line up the two arrows, then unscrew the bump, this will release the spool, then you wind the two strings in the opposite directions, the arrow on the spool will tell you the direction to wind the string, replace spool, spring, bump feed, and you are good to go. I hope this has helped you.