Easy
Less than 15 minutes
This is an authentic OEM sourced component which is designed for use with Toro handheld string trimmers. It is a high-quality replacement for a missing or a faulty bump knob that helps to retrieve the line. Please make sure to refer to the owners manual and the appropriate diagrams of your model for the correct application of this part. Keep in mind this high-quality bump knob is made of durable plastic and is sold individually. Replacing it is a simple task that does not require any tools, simply remove the old and secure the new.
Knob-bump 518803003
OEM part for: Homelite, Toro, Ryobi
Part Number: 518803003
$22.53
In Stock
Order within the next 10 hours and your part ships today! 
Compatibility
This Knob-bump will fit the following 4 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
Toro
Homelite
Ryobi
This item works with the following types of products:
- Trimmer Parts
Questions & Answers ?
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Customer Repair Instructions ?
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.
Bumper knob had worn down
James - April 7, 2018
Tool Type
Trimmer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Parts Used
Bumper knob did not need any tool it was removed by hand and able to put back in place by snapping bumper knob in previous location.
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Bump knob wore down.
irwin - June 4, 2017
Tool Type
Trimmer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
I took off the top of the head as if I was going to insert trimmer line and swapped the old bumper head for the new one.
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Bump knob was broken
Chuck - March 17, 2017
Tool Type
Trimmer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
, None
Parts Used
Simply removed the broken bump knob which can easily be done when replacing the string.
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Bump cap wore out
Paul - August 12, 2016
Tool Type
Trimmer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
, Hands
Parts Used
Removed old bump cap and replaced with a new one, simple.
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Bump knob worn down
Dennis - July 29, 2016
Tool Type
Trimmer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Adjustable Wrench
Took old string head off. put the new one on.
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OEM stands for Original Equipment Manufacturer and means the part you’re buying is sourced directly from the manufacturer who made your product. At eReplacementParts, we sell only genuine OEM parts, guaranteeing the part you’re purchasing is of better design and of higher quality than aftermarket parts.
Our product descriptions are a combination of data sourced directly from the manufacturers who made your product as well as content researched and curated by our content & customer service teams. This content is edited and reviewed internally before being made public to customers.
Our customer service team are at the ready daily to answer your part and product questions. We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
All our part reviews are solicited directly from other customers who have purchased this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
Based on data from past customer purchasing behaviors, these parts are most commonly purchased together along with the part you are viewing. These parts may be necessary or helpful to replace to complete your current repair.
All our installation videos are created and produced in collaboration with our in-house repair technician, Mark Sodja, who has helped millions of eReplacementParts customers over the last 13 years repair their products. Mark has years of experience in selling and repairing both commercial and residential products with a specialty in gas-powered equipment.
This data is collected from customers who submitted a repair instruction after replacing this exact part. Customers can rate how easy the repair was to complete and how long it took. We aggregate this data to provide a repair rating that allows customers to quickly determine the difficulty and time needed to perform their own repair.
