Easy
15-30 minutes
The adjustment lever knob attaches to the front axle assembly and is used to adjust the height of the lawn mower. This is an authentic OEM part that is made of plastic. The knob will need replacing when it becomes cracked or broken, and is available as an individual replacement part.
Knob-height Adjust 720-04131A
OEM part for: MTD, Yard Man, Yard Machines, Troy-Bilt
Part Number: 720-04131A
$6.15
In Stock
Ships within 1 business day 
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Compatibility
This Knob-height Adjust will fit the following 419 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
This item works with the following types of products:
- Lawn Mower Parts
This part replaces obsolete part #: 720-04131
Customer Part Reviews ?
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My lawn mower was easy to repair with the replacement parts.
The quality of the parts and the prompt delivery of the parts was awesome!
Guest -
July 8, 2020
Verified Purchase
Easy replacement.
Correct part. Fair price. Quick shipment.
Roland -
September 7, 2019
Verified Purchase
Lever knob
Worked fine.
Guest -
July 26, 2019
Verified Purchase
my 10 year old mower is working again
this lever knob fit right on the rear axle that I also ordered both parts were installed with no problem.
Guest -
July 15, 2019
Verified Purchase
Perfect Match
This was the exact part I needed to fix my lawnmower.
Guest -
June 21, 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.
The adjustment lever and knob on the mower broke and needed to be replaced
Steve - April 2, 2016
👍 2 of 2 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Socket set
It was very easy to figure out online what parts I needed. Actually bought extra Flange Lock Nuts as I didn't realize that they came with the axle assembly but it was no big deal. Borrowed a socket wrench from my son and the rest was a piece a cake. For around $35 including tax and shipping my lawn mower is like new. Used it yesterday!!
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lawn mower height adjustment for the front wheels did not work.
George - October 28, 2021
Tool Type
Lawn Mower
Difficulty
Medium
Time
1-2 hours
Tools Used
Pliers, Socket set, Wrench Set, Adjustable Wrench
After replacing both front wheels, which were badly worn out, I replaced the adjustment piece thinking this would solve my problem. That was very simple, just 2 bolts.
The root cause of my problem was a worn out front deck, which resulted in the front axle not staying in place. While this sounds like a huge repair job, it's not. Only 4 bolts hold the deck on, the new placement deck fit like a glove, now my mower works fine. I also replaced the front axle, just to be sure, so my "front end" job cost me a lot less than a new mower!
The root cause of my problem was a worn out front deck, which resulted in the front axle not staying in place. While this sounds like a huge repair job, it's not. Only 4 bolts hold the deck on, the new placement deck fit like a glove, now my mower works fine. I also replaced the front axle, just to be sure, so my "front end" job cost me a lot less than a new mower!
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wheels wobble
Harold - May 27, 2020
Tool Type
Lawn Mower
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Socket set, snap ring pliers
popped old axle out per video, replaced axle easy job
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Height adjust lever on front axel was broken
Jackie - September 15, 2019
Tool Type
Lawn Mower
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver, Socket set
Removed front axel, removed and transferred wheels to new axel and reattached new axel
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Hight adjustment lever broke. Had to replace the front axel assembly.
Gerald - August 27, 2019
Tool Type
Lawn Mower
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Socket set, Wrench Set
Took off the wheels then the front axel assembly. Put the new front end in and replaced the wheels.
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Front axle would not maintain cutting height due to adjustment lever being bent out of shape
Walter - May 31, 2018
Tool Type
Lawn Mower
Difficulty
Easy
Time
15-30 minutes
Tools Used
, Rubber mallet, small pry bar
Removed old axle from plastic front shroud on mower. Installed new axle in plastic shroud. Using pry bar to spread mounting tabs on underside of plastic shroud ,and using rubber mallet to drive axle into mounting tabs on each side . Had to shim slotted plate on top side outward so adjustment lever would lock in slots securely to maintain cutting height. I used two thin flat washers under slotted plate one on each side secured with original mounting screws. so far so good!
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Adjustment arms on axles were broken.
Robert - April 15, 2018
Tool Type
Lawn Mower
Difficulty
Easy
Time
30-60 minutes
Tools Used
Socket set, Wrench Set, 1/2 breaker bar-for blade replacement
Other then rusted hardware on blade and frozen bolts on wheels job went very easily.
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Height adjustment bar broke - integrated with rear axle
Britt - April 26, 2017
Tool Type
Lawn Mower
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Socket set, Needle nosed pliers
Determined axle was held in by plastic pressure clips. Once popped out the old axle the repair was simple. Just pop the new axle in at the proper orientation and remount the wheels.
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The rear adjustment lever was broken off the machine
Geoffrey - October 8, 2016
Tool Type
Lawn Mower
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Socket set
With the machine sitting on the ground, loosened the wheel nuts. I set the machine on three gallon buckets one under the front and one under each side in front of the rear wheels. Remove the wheels and 4 bolts (2 each side) holding the axle assembly to the deck. Remove the axle assembly from under deck. Install new one in reverse order.
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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.
