Medium
1-2 hours
This is a genuine OEM sourced part that is intended to be used with tillers from Troy-Bilt, Yard Machines, MTD, and Cub Cadet. The oil seal is used to prevent leaks between the drive shaft and the transmission case assembly. This item is available as an individual replacement part.
Seal-oil 921-04030
OEM part for: MTD, Troy-Bilt
Part Number: 921-04030
$13.05
In Stock
Ships within 1 business day 
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Compatibility
This Seal-oil will fit the following 354 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
Troy-Bilt
Show More Compatible ModelsThis item works with the following types of products:
- Cultivator Parts
This part replaces obsolete part #: 9617, GW-9617, 721-04030
Customer Part Reviews ?
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Everything went as planned thanks for your promptness shipping parts out
Working as intended
Guest -
May 27, 2021
Verified Purchase
I have the parts. Just need to review how to get everything back together and go for it.
everything arrived in great condition. It all looks good. Now I have to put the tiller unit back together.
Guest -
May 2, 2020
Verified Purchase
Fit and arrived quick
Good replacement. Fit right and came on time. They were very helpful when I ordered wrong.
Rockie -
April 7, 2020
Verified Purchase
Quick service!
Good service!!
Kevin -
August 8, 2019
Verified Purchase
Wrong part
Didn't fit
Guest -
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 Seal-oil
Are you sure this seal has an OD of 1&3/4 inches? It might be 1&1/4 inches? # 921-04030
mark
asked on 2022-02-10
Hi Mark,
Thank you for your question. The outer diameter would be 1-3/4 inches. If you would like to place an order for it, customer service is open 7 days a week and anyone will be happy to assist you. Please feel free to give us a call. We look forward to hearing from you!
eReplacementParts Team February 10, 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.
Gear box seal was leaking,
Tom - March 25, 2021
👍 1 of 1 people found this instruction helpful
Tool Type
Cultivator
Difficulty
Easy
Time
15-30 minutes
Tools Used
Socket set, Wrench Set, Impact gun
Parts Used
Put on jack stands, removed wheels, removed belt covers, removed bolt and pulley cleaned gearbox with break cleaner, permatexed the seal and drove it in place, reinstalled everything else in reverse
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rear oil seal on rototiller failed, lost lubrication and roller bearings were dmaged.
Edmund - May 2, 2019
👍 1 of 2 people found this instruction helpful
Tool Type
Cultivator
Difficulty
Hard
Time
More than 2 hours
Tools Used
Screwdriver, Pliers, Socket set, Wrench Set, Adjustable Wrench
removed tiller portion from engine section, removed tiller tines and rear differential, replaced diferential roller bearings and tiller oil seals, reassembled differential, replaced forward tiller shaft roller bearing and oil seal, reassembled full tiller assembly, reattached tiller to engine section, went to my garden and rototilled my brains out.
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All oil seals were leaking
Norman - May 31, 2018
Tool Type
Cultivator
Difficulty
Medium
Time
1-2 hours
Tools Used
Screwdriver, Pliers, Power Drill, Socket set, Wrench Set, Seal puller
Removed wheels and tunes.
Cleaned shafts.
Drove screws into seal and used screws to pull out seal.
Used pieces of pic pipe to tap new seals into place.
Replaced wheels and tines.
Fill transmission with oil.
Replaced cover gaskets.
Cleaned shafts.
Drove screws into seal and used screws to pull out seal.
Used pieces of pic pipe to tap new seals into place.
Replaced wheels and tines.
Fill transmission with oil.
Replaced cover gaskets.
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Thanks for voting and helping fellow customers!
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.
