Easy
15-30 minutes
This is a Genuine OEM replacement part designed to work with Troy-Bilt Gas String Trimmer. This part is attached to the Lower Boom Assembly and it is what drives/spins the Trimmer Head. It is secured to the unit with Two (2) Screws part #791-182195 (Sold Separately). Internal gears or the housing are not sold separately. Requires a Torx or a Flathead Screwdriver to attach it.
Gearbox Asm Short 753-08122
OEM part for: Troy-Bilt, Cub Cadet
Part Number: 753-08122
$24.81
In Stock
Order within the next 9 hours and your part ships today! 
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Frequently Purchased Together ?
Compatibility
This Gearbox Asm Short 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.
Troy-Bilt
Cub Cadet
This item works with the following types of products:
- Trimmer Parts
Customer Part Reviews ?
Average Rating (out of 5):
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Great Service
Web site made identifying the part easy. Shipping was quick and the part was correct and fixed my issue. Great service!
Guest -
August 17, 2023
Verified Purchase
Good service
Part was perfect and on time.
Bernhard -
October 10, 2021
Verified Purchase
Gearbox Worked Perfectly, Quick Shipping
Needed a new Gearbox for my TB32EC. Ordered this from RP. Professional, concise, well organized website, swift shipping. I'll will use RP again and would recommend them. Excellent YouTube repair videos too!
Guest -
August 20, 2021
Verified Purchase
The new gearbox was an exact
New gearbox installed and my weed-eater is like new again
PAul -
July 25, 2021
Verified Purchase
Troy Bolt replacement head
Quick delivery. Easy install. Tightened a few screws. That was it
Guest -
July 5, 2021
Verified Purchase
weed eater parts
Received the parts that I ordered in excellent condition. Fast delivery was very appreciated as well. Would not hesitate using Replacement Parts again when the time comes. Thank you.
Tom -
October 21, 2019
Verified Purchase
Troy built TB675es
1 st gear casein I ordered was wrong, so I had to order the second one. I didn’t realize that there was two TB675ec’s. My fault, but was resolved quickly
Guest -
August 2, 2019
Verified Purchase
Great servivce, thanks.
The gearbox for my weed eater is the correct one and now I am back in business at home with my yard.
Guest -
June 20, 2019
Verified Purchase
Easy repair, and worked as expected.
New part, had no issue was so ever.
Thomas -
May 20, 2019
Verified Purchase
Questions & Answers ?
Our customer Service team is at the ready daily to answer your part and product questions.
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We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
Does this fit my product?Questions & Answers for Gearbox Asm Short
Will the trimmer head fit with a Brush guard Attachment
Eugene
for model number TB575SS
asked on 2022-07-12
Hi Eugene,
Thank you for your question. A guard can fit over the trimmer head. If you could provide us with your model number, we would be happy to verify the correct guard for you. It can be found on the left or right side of the starter housing and it should start with 41 or 42. If you could resubmit your question with this information, we would be happy to help you. We are open 7 days a week. We look forward to hearing from you!
eReplacementParts Team July 12, 2022
will this fit my tb35ec ?
Mark
for model number tb35ec
asked on 2022-02-28
Hello Mark, thank you for writing. No, the part you had chosen is not compatible for your model. The correct part for your model number is 753-08180. We hope to hear from you soon.
eReplacementParts Team February 28, 2022
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.
Stripped gears
anthony - May 25, 2016
👍 6 of 6 people found this instruction helpful
Tool Type
Trimmer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, None
Parts Used
Remove the screws that connect the gearbox to the lower shaft and slide it off. Slide the new gearbox on the lower shaft, making sure it connects with the lower drive shaft. Then tighten the screws to connect the new gearbox.
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The gear box wore out
Edward - June 30, 2016
👍 3 of 4 people found this instruction helpful
Tool Type
Trimmer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Socket set
Remove the screws from the shaft housing holding the old gearbox on. And remove the old gearbox. Install the new gearbox with the screws. Then just thread the new cutting head assembly to the spindle
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The gears inside the head wore out.
Leonard - June 22, 2016
👍 2 of 2 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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I replaced the head on my Troybilt trimmer cause the line kept breaking
Michael - August 23, 2017
👍 1 of 1 people found this instruction helpful
Tool Type
Trimmer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver, Torx set
Removed the old shaft. Assembled new gear box on new shaft and coupled it to the main body. Put the new head on and Its working.
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Gear stripped in gearbox assembly
Gary - June 14, 2016
👍 1 of 1 people found this instruction helpful
Tool Type
Trimmer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver
Parts Used
Replaced the gearbox assembly
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Teeth stripped on gear
herlon - April 27, 2016
👍 2 of 3 people found this instruction helpful
Tool Type
Trimmer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver, Socket set
Parts Used
Remove the screws that hold the gearbox to the lower shaft and remove the old gearbox. Screw the new gearbox onto the lower shaft and your done. Thank you.
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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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Trimmer head and neck replacement.
Robie - April 12, 2023
Tool Type
Trimmer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Pliers, Hammer
Parts Used
Removed screws and slid off.
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Bearings frozen in gear mechanism
Mark - September 18, 2020
Tool Type
Trimmer
Difficulty
Medium
Time
15-30 minutes
Tools Used
Screwdriver
Parts Used
Removed old assembly and checked for damage
Ordered new part
Took new gear assembly a part and found only one side of the bearings were sealed
Applied extra gear grease around exposed bearings and reassembled
Did this to prevent another premature failure.
Unit needs to be sealed to keep the bearings free from dirt otherwise you’ll be spending more money on spare parts in a very short time.
Ordered new part
Took new gear assembly a part and found only one side of the bearings were sealed
Applied extra gear grease around exposed bearings and reassembled
Did this to prevent another premature failure.
Unit needs to be sealed to keep the bearings free from dirt otherwise you’ll be spending more money on spare parts in a very short time.
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Gears stripped in my trimmer attachments
Josh - May 22, 2020
Tool Type
Trimmer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Pliers, Power Drill
Parts Used
Removed the old gearbox assembly.
Opened new gearbox assembly.
I used the new gears in my old gearbox assembly.
I wish they would just sell the gears, that’s what probably 80% of the people need.
Opened new gearbox assembly.
I used the new gears in my old gearbox assembly.
I wish they would just sell the gears, that’s what probably 80% of the people need.
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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.
