Easy
Less than 15 minutes
Genuine OEM replacement part, this item is sold individually.
This is part of the bit holder system of the Impact Drivers listed below.
Its purpose is to help hold the screw bit in place, once it has been inserted into the bit holder.
Spring N078434
OEM part for: DeWALT, Porter Cable
Part Number: N078434
$4.99
In Stock
Ships within 1 business day 
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Product Description ?
- Classification: Part
- Weight: 0.01 lbs.
- Shipping: Ships Worldwide
Frequently Purchased Together ?
Compatibility
This Spring will fit the following 49 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
Displaying 20 of 49 matching models.
49 total model matches. Try the above search to narrow your results.
This is the official OEM part for the following brands:
- DeWALT
- Porter Cable
This item works with the following types of products:
- Impact Driver
Repair Videos ?
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Spring
Customer Part Reviews ?
Average Rating (out of 5):
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5 stars
58
4 stars
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Looked and worked like the one that broke
The part arrived fairly quick and it when together some what easy. I would use them again.
Ken -
November 1, 2024
Verified Purchase
Easy to replace this part on our drill.
My husband ordered a few of these to fix our drills! Saved us from having to buy new drills.
Guest -
January 2, 2024
Verified Purchase
Worked perfectly
Awesome
Tom -
July 4, 2023
Verified Purchase
Ease fix the bits no longer fall out of chuck on impact driver
Arrived quickly and in good condition.
Frank -
June 28, 2023
Verified Purchase
Perfect service as always
Parts fit perfect for my Dewalt impact wrench, easy fix
Guest -
June 3, 2023
Verified Purchase
Saved Lots of money
My bit kept falling out of my impact driver. Watched a video on YouTube to learn how to replace this spring.
The spring works great and my boys now stay in the driver.
Doug Morrissey -
June 2, 2023
Verified Purchase
Rebuild
Fit and functioned as it should, returned tool toe pre broken condition.
Guest -
September 21, 2022
Verified Purchase
Easy repait
The part was in great condition and arrived on time
Guest -
September 16, 2022
Verified Purchase
part fit.great
Worked good parts fit perfectly thanks
Anonymous -
August 24, 2022
Verified Purchase
Ereplacement Parts is the Bomb.com
This will be short and simple. Prices, videos, and parts are on point. If you have tools not working properly a part that needs replacing. This is the place to look
Thanks again. I Recommend. E Replacement Parts
Brian -
August 11, 2022
Verified Purchase
Questions & Answers ?
Our customer Service team is at the ready daily to answer your part and product questions.
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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.
Impact driver would not hold bit tip
Charles - April 15, 2016
👍 49 of 53 people found this instruction helpful
Tool Type
Impact Driver
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
Watched your video for this repair and it made it very easy to do. Watch for flying parts as you remove split ring . It's little hard to get split ring started back on. Here is a copy of the video
https://www.youtube.com/watch?v=PQ8lSB_mP1c
https://www.youtube.com/watch?v=PQ8lSB_mP1c
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The spring that kept tension on the ball bearing broke.
Larry - June 22, 2016
👍 10 of 10 people found this instruction helpful
Tool Type
Impact Driver
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
1. Removed clip, washer, spring.
2. Removed housing
3. Removed broken spring and replaced with new spring, making sure ball bearing was in correct place.
4. Replaced housing, spring, washer and clip.
2. Removed housing
3. Removed broken spring and replaced with new spring, making sure ball bearing was in correct place.
4. Replaced housing, spring, washer and clip.
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Impact wasnt holding the bit in place
Nick - May 30, 2016
👍 5 of 5 people found this instruction helpful
Tool Type
Impact Driver
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver, Screwdriver, pick, small flat screwdriver
I watched your you tube video on just this repair. I know I could have done without it . But it did help out. Thank you
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Ball bearing wasn't catching drill bit, would slide in and out freely without locking in place
Paul - September 1, 2017
👍 3 of 3 people found this instruction helpful
Tool Type
Impact Driver
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Pliers
Parts Used
1.) Removed "C" ring from the nose of drill
2.) Removed slide and springs
3.) Noticed issue right away, there are 2 springs, one to pull back on slide for chucking bit and one to hold ball bearing in place.
4.) Placed ball bearing in hole, slid new spring on to hold ball bearing.
5.) Slipped slide spring over that, then slide, then "C" ring
2.) Removed slide and springs
3.) Noticed issue right away, there are 2 springs, one to pull back on slide for chucking bit and one to hold ball bearing in place.
4.) Placed ball bearing in hole, slid new spring on to hold ball bearing.
5.) Slipped slide spring over that, then slide, then "C" ring
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Driver would not hold bits in.
Buddy - December 7, 2017
👍 1 of 1 people found this instruction helpful
Tool Type
Impact Driver
Difficulty
Medium
Time
15-30 minutes
Tools Used
Screwdriver, Pliers, Jeweler\'s pliers
Parts Used
1. Removed the parts and added the spring.
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Bit falls out or gets stuck.
Richard - December 2, 2017
👍 1 of 1 people found this instruction helpful
Tool Type
Impact Driver
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
Took off the clip on the end of the chuck. Removed the collar and the spring. Then, replaced the chuck ball spring. Put on the collar, the spring and the spacer. Put the clip back on. Like new again. Watched video on youtube by ereplacementparts.com and it was just easy easy.
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Bit holder worn
Lyle - December 17, 2016
👍 1 of 1 people found this instruction helpful
Tool Type
Impact Driver
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
I watched the video that you have on you tube. It was a great help. I also installed the belt hook on the tool.
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Bit would not stay in chuck
Jason - September 30, 2018
Tool Type
Impact Driver
Difficulty
Medium
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
Removed retention ring
Disassembled chuck
Replaced broken spring
Reassembled chuck
Disassembled chuck
Replaced broken spring
Reassembled chuck
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Bits were falling out.
Erik - September 27, 2018
Tool Type
Impact Driver
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
Pulled the lock ring and removed collar with springs. It's the rear spring that needs replaced. Put back together in reverse order.
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Driver would no longer hold the bit
Wayne - September 1, 2018
Tool Type
Impact Driver
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver, Ice pick
Parts Used
1. Mounted impact driver in bench vise with chuck facing slightly upwards.
2. Push collar back and use ice pick or similar tool to pop collar snap ring off being careful not to over stress it.
3. Remove snap ring, washer, collar, collar spring.
4. Turn shaft until slotted section for ball bearing is face up.
5. Remove damaged lock spring and ball bearing ( if bearing is still there ).
6. Install ball bearing in slot and new bearing spring.
7. Replace collar, spring, washer, and snap ring.
2. Push collar back and use ice pick or similar tool to pop collar snap ring off being careful not to over stress it.
3. Remove snap ring, washer, collar, collar spring.
4. Turn shaft until slotted section for ball bearing is face up.
5. Remove damaged lock spring and ball bearing ( if bearing is still there ).
6. Install ball bearing in slot and new bearing spring.
7. Replace collar, spring, washer, and snap ring.
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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.
Learn MoreOur 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.
