Easy
15-30 minutes
It is made of metal and is sold individually. The nut attaches to the washer and the front bracket deck. If this nut becomes broken or stripped it will need to be replaced. A wrench will be needed to replace this part. This is a replacement part directly sourced from the manufacturer for use in ride mowers and lawn tractors made by Husqvarna, Poulan, Weed Eater, and Jonsered.
Nut, Lock, Flange, 7/16 873900700
OEM part for: Husqvarna
Part Number: 873900700
$7.46
In Stock
Order within the next 12 hours and your part ships today! 
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Compatibility
This Nut, Lock, Flange, 7/16 will fit the following 2121 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
Husqvarna
Show More Compatible ModelsThis item works with the following types of products:
- Lawn Mower Parts
This part replaces obsolete part #: 73900700
Customer Part Reviews ?
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perfect
all 4 parts ordered arrived quickly. exactly as ordered. worked great!!
Guest -
August 7, 2023
Verified Purchase
Lawn mower repair parts
Great service. So far the repair parts are working fine and so is our mower.
Thanks for your quick response.
Guest -
August 14, 2021
Verified Purchase
Quality Parts and Professional Services
All the Parts went on perfect, came when they said they would. I would recommend replacementparts.com to anyone.
Mike -
July 29, 2020
Verified Purchase
Easy Fix !!!
Part arrived quickly, put it on....good to go. You Guys are a 10 Star Company....10 Stars from the Ordering Process, Shipping and Delivery.. 10 Star Service......I would Highly Recommend eReplacement Parts to Everyone !!!
ANNE -
August 19, 2019
Verified Purchase
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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.
bolt holding the mower deck height adjustment broke
Charles - July 25, 2020
👍 1 of 1 people found this instruction helpful
Tool Type
Lawn Tractor
Difficulty
Easy
Time
15-30 minutes
Tools Used
Socket set, Wrench Set, floor jack
removed mower engine cover
removed muffler
jacked up frame
removed broken bolt and replaced with new bolt & nut
reassembled
removed muffler
jacked up frame
removed broken bolt and replaced with new bolt & nut
reassembled
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idler pulley froze up.
william - June 28, 2021
Tool Type
Lawn Tractor
Difficulty
Easy
Time
15-30 minutes
Tools Used
Socket set
remove mower deck
unbolt old pulleys and replace with new.
install mower deck.
unbolt old pulleys and replace with new.
install mower deck.
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Replaced stationary idler pulley and pully idler on rider mower deck
John - May 14, 2021
Tool Type
Lawn Tractor
Difficulty
Medium
Time
1-2 hours
Tools Used
Socket set, Wrench Set
1. removed the mower deck
2. removed the 2 damaged pullies using a socket set and a wrench
3. installed the 2 new pullies using a socket set and a wrench
4. reinstalled mower deck to rider mower
5. started mowing.........and all went well!
2. removed the 2 damaged pullies using a socket set and a wrench
3. installed the 2 new pullies using a socket set and a wrench
4. reinstalled mower deck to rider mower
5. started mowing.........and all went well!
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Bearing seized and cause bolt failure.
Daniel - November 2, 2020
Tool Type
Lawn Mower
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Wrench Set, Nutdriver, Adjustable Wrench
Removed pulley cover. Assembled bolt, pulley, and thin washer. Making sure to place tensioner bracket correctly. Rerouted belt. Replaced pulley cover.
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Pulley broke on cutting deck
Richard - November 15, 2015
Tool Type
Lawn Tractor
Difficulty
Medium
Time
15-30 minutes
Tools Used
Screwdriver, Pliers, Socket set
Use manual to make repairs. Good instruction.
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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.
