Easy
15-30 minutes
This is a Genuine OEM sourced replacement part designed for use with string trimmers. This item is made out of metal and it is sold individually. It is the lower shaft that the gearbox is attached to.
• Loosen the knob on the coupler of the power head shaft and remove the end cap from the attachment
• Push in the button located on the attachment shaft and remove the old boom assembly
• Remove the anti-rotation screw from the gearbox and separate it from the shaft
• Secure the new shaft with the gearbox using the same anti-rotation screw
• Secure the boom assembly with the coupler and upper shaft
Lower Boom Assembly 753-08164
OEM part for: Yard Man, MTD, Troy-Bilt, Craftsman, Cub Cadet, Murray, Yard Machines
Part Number: 753-08164
$21.13
In Stock
Ships within 1 business day 
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Product Description ?
- Classification: Part
- Weight: 1.39 lbs.
- Shipping: Ships Worldwide
Frequently Purchased Together ?
Compatibility
This Lower Boom Assembly will fit the following 116 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
Troy-Bilt
Yard Man
MTD
Craftsman
Cub Cadet
Murray
Yard Machines
Show More Compatible ModelsThis item works with the following types of products:
- Trimmer Parts
This part replaces obsolete part #: 753-06139 ((Incl. 11)), 753-06789, MTD 753-08164, 753-06881, 753-06139
Customer Part Reviews ?
Average Rating (out of 5):
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Return process.
Even though I ordered the wrong part, I found the return and refund process easy and efficient.
Guest -
June 4, 2022
Verified Purchase
Perfect
The right part and fast service
Guest -
September 14, 2021
Verified Purchase
Exact replacement part.
I was about to go buy another weed eater until I found e replacement parts. They had the exact parts that I needed and it was a simple replacement. Price was reasonable and saved me a couple hundred $ of the cost of buying a new weed eater.
Vernon -
April 27, 2021
Verified Purchase
Easy repair
Arrived quikly and work perfectly
ELADIO -
October 6, 2020
Verified Purchase
Fits perfect. Awesome web site for small engine tool parts..
Great condition, arrived quickly, weed eater is running like a champ again..
Jim -
July 6, 2020
Verified Purchase
Just the part I needed & worked great
Fast shipping, great part & super service! Thanks
Guest -
September 6, 2019
Verified Purchase
worked perfectly, but...
lower boom assembly was a perfect fit, however, I wish in the description they would let you know that the drive shaft part is also included....I bought the drive shaft as well, and didn't need it because it was included
Guest -
November 11, 2021
Verified Purchase
WEEDEATER BOOM ASSEMBLY
PART NOT IDENTICAL, BUT HOPEFULLY ADAPTED AND WILL WORK NEXT SPRING WHEN YARD WORK RESUMES. WON'T KNOW IF IT WILL PERFORM UNDER LOAD UNTIL THEN.
Guest -
December 21, 2021
Verified Purchase
eReplacementParts Team
Hi Mary,
Thank you for your review. Please accept our apologies for this situation. We will be in touch with you shortly regarding your order.
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.
Gears stripped on lower angle drive gear box and retaining screw hole egged out on lower boom.
Stephen - May 22, 2017
👍 4 of 4 people found this instruction helpful
Tool Type
Trimmer
Difficulty
Easy
Time
30-60 minutes
Tools Used
Screwdriver, Pliers, Power Drill, Socket set
Removed the lower boom and the gear box from the string head and installed the new items.
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Catch broken on boom assembly so would not attach to upper part.
Kelly - May 3, 2016
👍 4 of 4 people found this instruction helpful
Tool Type
Trimmer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Wrench Set
Parts Used
Remove tightening knob on upper boom and remove the original lower part of the boom.Take off the guard then the head of weed eater at the end of the boom. Once both of these are off, attach both to the end of the new lower boom. Once on, attach to upper part and you're ready to go.
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Cutting Head assembly was moving when applying throttle.
Gary - September 6, 2017
👍 1 of 1 people found this instruction helpful
Tool Type
Trimmer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Wrench Set
1. Removed the debris guard.
2. Removed the anti rotation screw.
3. Removed the rotating head assembly.
4. Loosened the locking knob in the coupling.
5. Depressed the small dent button and pulled the lower boom assembly out from the coupling.
6. Inserted the new lower boom; tightened the knob; installed the rotating head assembly; installed a new anti rotation screw; mounted the debris guard.
7. Started the trimmer to check all was correct.
2. Removed the anti rotation screw.
3. Removed the rotating head assembly.
4. Loosened the locking knob in the coupling.
5. Depressed the small dent button and pulled the lower boom assembly out from the coupling.
6. Inserted the new lower boom; tightened the knob; installed the rotating head assembly; installed a new anti rotation screw; mounted the debris guard.
7. Started the trimmer to check all was correct.
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The string wasn't feeding so I smacked the head harder to feed the string and bent the lower shaft so I needed to replace it
Shayne - September 15, 2016
👍 1 of 1 people found this instruction helpful
Tool Type
Trimmer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Loosened the screws holding the shaft
Removed the string guard and the gear head
Replaced with the new shaft and gear head
Tighten the screws up and good to go
Removed the string guard and the gear head
Replaced with the new shaft and gear head
Tighten the screws up and good to go
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Bad Trimmer head, also set screw on trimmer shaft assembly worn out.
Gary - May 16, 2023
Tool Type
Trimmer
Difficulty
Medium
Time
1-2 hours
Tools Used
Screwdriver, Pliers, Socket set, Wrench Set, Nutdriver, Adjustable Wrench
Replaced cutting head.
Created repair sleeve for worn out set screw hole on old lower boom assembly
Found new set screw since one did not come with gearbox assembly.
Replaced screws on gear box with bolts so it could be tightened to the new lower boom assembly
I set up the old gearbox assembly and boom with trimmer head. New gearbox and lower boom assembly used for wire brush cut head.
Created repair sleeve for worn out set screw hole on old lower boom assembly
Found new set screw since one did not come with gearbox assembly.
Replaced screws on gear box with bolts so it could be tightened to the new lower boom assembly
I set up the old gearbox assembly and boom with trimmer head. New gearbox and lower boom assembly used for wire brush cut head.
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Lower boom assembly was broke on the end , coupler also needed replaced
Vic - August 10, 2022
Tool Type
Trimmer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Removed shaft from weed eater head and replaced with new one
Took broken coupler off and replaced it with a new coupler
Took broken coupler off and replaced it with a new coupler
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Stripped gear
James - June 11, 2021
Tool Type
Trimmer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Socket set
Disassembled and re-assembled
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Needed the lower tube and gear box
Rick - July 20, 2020
Tool Type
Trimmer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Socket set
I found out I ordered the wrong lower tube but the gear box works great . I needed the lower tube that has the button on side of tube for different attachments instead of the one that just slides in . Ended up fixing my old lower end and put new gear box on it and everything works great again. I have the 4 stroke weed eater and it really does the job .
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Trimmer head failed to rotate smoothly-Replaced below upper boom assembly except trimmer head
Craig - March 27, 2020
Tool Type
Trimmer
Difficulty
Easy
Time
30-60 minutes
Tools Used
Screwdriver, Allen Wrench
Removed the trimmer head by inserting allen wrench in recess of gearbox and twisted off trimmer head.
Removed gearbox off of lower boom assembly by removing screws on gearbox
Installed a new gearbox on a new lower boom assembly. Fortunately the new lower boom assembly had a new lower flexible shaft installed.
Reinstalled trimmer head onto gearbox with a twisting motion. Used allen wrench in recess of gearbox to enable the installation of the trimmer head onto the gearbox shaft.
Removed gearbox off of lower boom assembly by removing screws on gearbox
Installed a new gearbox on a new lower boom assembly. Fortunately the new lower boom assembly had a new lower flexible shaft installed.
Reinstalled trimmer head onto gearbox with a twisting motion. Used allen wrench in recess of gearbox to enable the installation of the trimmer head onto the gearbox shaft.
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The Screw to keep Head of Trimmer had stripped and ruined the lower boom
Roger - May 14, 2018
Tool Type
Trimmer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Removed Trimmer Head from lower boom. Removed lower boom. Replaced lower boom. Replaced Trimmer Head. No Problem.
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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.
