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DennisH, Appliance Technician
Category: Appliance
Satisfied Customers: 198
Experience:  14 years with current appliance repair company
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I have a Troy-Bilt TB425CS 4-cycle gas trimmer. Bump knob ...

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I have a Troy-Bilt TB425CS 4-cycle gas trimmer. Bump knob wouldn''t come off so I utilized speed wind feature but then the line when I ran the trimmer the line would continually advance. Finally got bump knob off and with bump knob removed I see one of the necessary springs that go under the metal slide "thingy" is missing. I have the replacement spring but can''t figure how to get it in there. Anybody know the answer?


They say a picture is worth a thousand words let Me know if this helps>


Thank You for using


Customer: replied 8 years ago.
I think we are on the right track. I think part 34 is the "thingy" I have to get the spring under (It's hard to see it clearly even at full view)
Customer: replied 8 years ago.
I don't know how to get parts 37-34 off and don't want to break it.

Key item 38 is a c-clip pop this off with a screw driver, then the pieces will slide off spline.


DennisH and 5 other Appliance Specialists are ready to help you
Customer: replied 8 years ago.
Thanks Dennis, Should have looked at it w/my magnifying glass before I called you. Answer is well worth the $. You saved me aXXXXXto my nearest repair guy. Awesome!!!!
Happily Weed Wacking in the Sierras....