Description
Overview:
The Knob, Bump for the Oregon 55-990 trimmer head is the replacement bump-feed cap that allows line to be advanced by tapping the head on the ground during use. Made from a hard-wearing, impact-resistant polymer, it is designed to withstand regular contact with soil, turf, and paving. This is a Genuine Oregon OEM part with Manufacturer Part Number (MPN) 55-524, ensuring correct fit and performance on the 55-990 head. It is suitable for many petrol grass trimmers/strimmers and brushcutters fitted with the Oregon 55-990 universal head. Replacing a worn or cracked bump knob restores reliable line feed and prevents premature wear of the trimmer head components. Supplied as the knob only; spool, spring and other head parts are not included.
Key Features:
- Genuine Oregon OEM component (MPN 55-524) for assured fit and quality
- Direct replacement for the bump knob used on the Oregon 55-990 trimmer head
- Durable, impact-resistant construction for repeated ground contact
- Restores smooth bump-feed operation to advance cutting line reliably
- Quick, straightforward installation; no special tools typically required
- Secure engagement to help prevent line jamming and uneven feed
- Resistant to moisture and abrasion for longer service life in outdoor use
- Ideal for routine maintenance where the original cap is worn, cracked, or missing
- Supplied individually; compatible with standard nylon line used in the 55-990 head
- Suitable for both domestic and professional users maintaining lawns, edges, and rough grass
Typical Applications:
Used on grass trimmers/strimmers and brushcutters fitted with the Oregon 55-990 head to manage line advance by bump-feed. Ideal for regular maintenance tasks such as lawn edging, trimming around trees, posts and borders, and clearing overgrown patches where frequent line feed is needed.
Also known as:
Bump cap, spool cap, line feed knob, tap knob, trimmer head cap, strimmer bump button, Oregon 55-990 cap.
Fits Models:
55-990
Alternate Part Numbers:
OR55-524, OR55524
Product Specifications
| L&S Part No. | OR55-524 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Oregon |
| OEM No. | 55-524 |
| Unit of Sale | 1 |
| Machine Type | Trimmer Head |
| Fits Brands | Oregon |
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