Easy
15-30 minutes
This is an authentic OEM part for use in Troy-Bilt trimmers and goes inside the cutting head assembly. If this part becomes broken it will need to be replaced. A screwdriver may be needed when replacing this part. The bump knob is made of plastic and is available as an individual replacement part.
Bump Knob Blk 753-08157
OEM part for: Troy-Bilt, MTD
Part Number: 753-08157
$5.14
In Stock
Ships within 1 business day 
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Frequently Purchased Together ?
Compatibility
This Bump Knob Blk will fit the following 9 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
Displaying 9 of 9 matching models.
Troy-Bilt
MTD
9 total model matches. Try the above search to narrow your results.
This is the official OEM part for the following brands:
- MTD
- Troy-Bilt
This item works with the following types of products:
- Trimmer
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.
Needed new bump knob
Willie - November 25, 2016
👍 1 of 1 people found this instruction helpful
Tool Type
Trimmer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Parts Used
Remove the bottom cap
Press the bump knob into the spool
Replace the bottom cover
Press the bump knob into the spool
Replace the bottom cover
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The bump knob was so worn that it would not let the line out
Tony - July 1, 2017
👍 1 of 2 people found this instruction helpful
Tool Type
Trimmer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
I just replaced the bump know.I also ordered 1 extra bump knob and a cutting head assembly. Never know when you might need extra
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Oil fill cracked
Thomas - June 3, 2017
Tool Type
Trimmer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Torx driver
1. Remove screws from bottom casing.
2. Remove 2 upper cover screws.
3. Remove screw on oil fill plug.
4. Pull out and replace fill plug.
5. Replace all screws.
Easy!
2. Remove 2 upper cover screws.
3. Remove screw on oil fill plug.
4. Pull out and replace fill plug.
5. Replace all screws.
Easy!
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Line not coming or too much coming, line not cutting, tune up
Chris - May 6, 2017
Tool Type
Trimmer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Socket set
Remove the bottom cap of the cutterhead remove the old bump head and snap on the cover.
Replace the blade assembly with the screws and nuts. Remove the old spark plug and install the new one.
Replace the blade assembly with the screws and nuts. Remove the old spark plug and install the new one.
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The gears inside the head wore out.
Leonard - June 22, 2016
👍 0 of 1 people found this instruction helpful
Tool Type
Trimmer
Difficulty
Medium
Time
15-30 minutes
Tools Used
Screwdriver, Pliers
I unscrewed the gearbox and installed the new gearbox to the drive shaft. I needed the cutting head assembly just screws onto the shaft from the gear box. The bump head snaps onto the housing, but I ordered one just to have a spare.
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Learn MoreOur 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.
