537338701 Trimmer Head Bump Knob
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$10.53
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$11.69
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$10.53
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537338701 Trimmer Head Bump Knob
Key Features
- Direct replacement bump knob for string trimmer heads.
- Activates the line-feeding mechanism when tapped on the ground.
- Constructed from durable, high-impact plastic for extended wear life.
- Enables quick and simple replacement of a worn or broken part.
Replaces / Cross-Reference Part Numbers
- OEM Part Number: 537338701
Compatibility & Fitment
- Trimmer Head Models: Fits Husqvarna T-25 and T25 heads.
- Compatible Brands: Husqvarna, Jonsered, RedMax.
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Select Husqvarna Trimmer Models:
- 122C, 124C, 124L, 125L, 125LDx
- 128L, 128LD, 128LDx, 128R, 128RJ
- 223L, 223R
When to Replace
- Existing knob is cracked, broken, or worn through from ground contact.
- Trimmer line fails to advance when the head is tapped.
- The knob is loose or will not stay attached to the trimmer head spool.
Installation Tips
- Disconnect the spark plug wire before performing any maintenance.
- Disassemble the trimmer head to access and remove the spool.
- Unscrew the old bump knob from the spool assembly. Note: Threads may be left-handed (reverse).
- Clean any dirt or debris from the spool threads.
- Firmly screw the new knob into place. Do not overtighten.
- Reassemble the spool and trimmer head housing.