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Rick, Factory Authorized Trainer
Category: Small Engine
Satisfied Customers: 8057
Experience:  Outdoor Power Equipment technical trainer since 1990, covering eight states.
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I have a TROY-BILT 4-cycle Gas Trimmer (TB525 EC). I am trying

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I have a TROY-BILT 4-cycle Gas Trimmer (TB525 EC). I am trying to replace line.


On this one you don't remove the spool. Just line up the arrows and feed it from the outside. However, to remove the bump knob, you press the tabs from the side. I'm linking to a manual below with instructions on page 5. Putting the new one on is illustrated on page 6.




Hope this helps! Let me know if anything isn't clear.

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