Medium
15-30 minutes
This is a Genuine OEM replacement part used on Toro Lawn Mowers. This is a Metal Spring and it is Sold Individually. The spring moves the key up and down. When the key moves down on the drive axle you are able to reverse the machine. When the key moves up, it will engage the drive system. Over time springs may loose its tension and may not function as intended. If this part is lost or damaged it must be replaced.
Compression Spring 39-9650
OEM part for: Toro, Lawn Boy
Part Number: 39-9650
$3.99
In Stock
Ships within 1 business day 
Jump To:
Frequently Purchased Together ?
Compatibility
This Compression Spring will fit the following 510 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
Toro
Lawn Boy
Show More Compatible ModelsThis item works with the following types of products:
- Lawn Mower Parts
This part replaces obsolete part #: 53-7850
Customer Part Reviews ?
Average Rating (out of 5):
Click to filter by ratings:
5 stars
4
4 stars
1
3 stars
0
2 stars
0
1 stars
0
< PREV
- 1
Transaction Perfection
Everything I needed, available, and timely delivered. As good as it gets.
Guest -
June 28, 2020
Verified Purchase
FIT PERFECTLY !
This part along with 3 others, and my mower is going strong again. This site is a pleasure to work with... extremely helpful and very fair prices.
Guest -
June 15, 2020
Verified Purchase
Worked as expected arrived sooner than I
Expected
Donald -
June 8, 2020
Verified Purchase
Definitely use you guys again
All parts I ordered were spot on and everything was as original equipment and fit perfectly service was impeccable parts were perfect, definitely use you guys again
Guest -
May 9, 2019
Verified Purchase
Everything was good but returned something and still waiting for credit.
Everything was good but returned something and still waiting for credit.
Guest -
October 14, 2020
Verified Purchase
Questions & Answers ?
Our customer Service team is at the ready daily to answer your part and product questions.
Ask our Team
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 Compression Spring
My mower won't keep running when the pull cord is pulled. Most of the time it won't even turn over. It's been thoroughly worked on. However, there's a small spring- the size of one on a ball point pen. It has a wire circle at each end. Is this part of the mower and where does it go?
Sharon
for model number 123M02-0133-F1
asked on 2022-03-27
Hello Sharon, thank you for writing. Based on the model and description, you may be looking for the Governor Spring 691292. This spring is used to return the throttle lever after a change in the motor's output based on the load controlled by the governor. If you need help placing an order, customer service is open 7 days a week. Please feel free to give us a call. We look forward to hearing from you.
eReplacementParts Team March 27, 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.
Drive gear components were missing/spring for key was broken
Craig - June 27, 2016
👍 8 of 9 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Medium
Time
15-30 minutes
Tools Used
Socket set, pick/awl
Removed wheel, cleaned the axle, used a pick to pull the old damaged spring from its hole, Installed new components and reassembled.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
I'm not sure exactly what happened. My wife called me and said that the tire exploded. The plastic hub had twisted up like a straw.
Bert - May 17, 2016
👍 3 of 3 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Pliers, Socket set
I set the lawn mower up on blocks. Installed the spring, set the shafts key over the spring, slid the gear over top. Put the washer in place, used needle nose pliers to lock in the snap ring, put the tire on and used a 1/2" socket to tighten up the tire. Very easy.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Keys & springs worn out, gear also
Ronald - June 5, 2017
👍 2 of 2 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver, Pliers, Socket set, Grease
Removed drive wheels then removed retaining clips from drive axle. Removed drive gear ,key & spring. Be sure to pay attention to the direction of the pinion gear when you reinstall it. if you install it in the wrong direction it won,t drive the wheel when it is put into drive mode. Grease all parts and reinstall in reverse of disassembly and you are ready to go. Easy repair just pay close attention to disassembly and you are good to go.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Right side drive wheel was not engaging.
Robert - June 17, 2016
👍 3 of 4 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Medium
Time
15-30 minutes
Tools Used
Screwdriver, Pliers, Socket set
1. Removed right side drive wheel and exposed damaged pinion gear.
2. Key and spring were damaged also.
3. Cleaned key way and spring retaining hole and installed new parts.
4. Installed new pinion gear with thrust washers and spring clips.
5. Installed existing wheel, started mower
2. Key and spring were damaged also.
3. Cleaned key way and spring retaining hole and installed new parts.
4. Installed new pinion gear with thrust washers and spring clips.
5. Installed existing wheel, started mower
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Left wheel bearing was worn out
Frank - September 8, 2016
👍 1 of 1 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Medium
Time
15-30 minutes
Tools Used
Screwdriver, Pliers, Socket set, Wrench Set
1. Removed old one
2. Replaced with new one
2. Replaced with new one
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Drive wheels would not pull lawn mower
Larry - August 31, 2016
👍 1 of 1 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Medium
Time
15-30 minutes
Tools Used
Screwdriver, Pliers, Socket set, Vice to set bearings
1. Remove front wheels
2. Remove height adjuster front wheels
3. Remove old bearing holders
4. Press bearings into new bearing holders with vice
5. Install new bearing holders
6. Replace height adjusters
7. Replace wheels
2. Remove height adjuster front wheels
3. Remove old bearing holders
4. Press bearings into new bearing holders with vice
5. Install new bearing holders
6. Replace height adjusters
7. Replace wheels
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Lawn mower would not self propel
George - September 1, 2016
👍 1 of 1 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Medium
Time
15-30 minutes
Tools Used
Pliers, Socket set
Took the axle apart, put the new pieces on, started the mower and it worked great.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Self propel not working
Richard - April 6, 2016
👍 1 of 1 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Medium
Time
1-2 hours
Tools Used
Screwdriver, Pliers, Socket set
When we investigated the reason for the self-propel not working, we found numerous parts missing and the gear off the shaft. Replaced parts and reassembled and thankfully it is working like a charm. Just followed the parts diagram. And take your time.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Front wheels would not move with axle
Timothy - October 24, 2020
Tool Type
Lawn Mower
Difficulty
Easy
Time
15-30 minutes
Tools Used
Pliers, Socket set, Nutdriver
Removed front wheels, drive gears, key and spring. Thrust washers were broken along with locking ring clip.
Replaced wheel bears just because I had the front end apart.
Replaced wheel bears just because I had the front end apart.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Lost front drive
Charles - May 29, 2020
Tool Type
Lawn Mower
Difficulty
Easy
Time
30-60 minutes
Tools Used
Socket set
Basically I rebuilt the whole drive unit this was the last parts to be replaced. Pretty easy.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Load More Install Stories
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.
