O-rings are made to contain thousands of PSI pressure by creating a seal between two or more parts. O-ring measurements are specified by the inside diameter and the thickness. Of the many causes for O-Ring failure, the most common among power tools are: Extrusion and Nibbling - O-ring has ragged, tattered edges. These are commonly caused by pressure spikes which shear off tiny "bites" from the o-ring, or caused by clearance gaps. Abrasion - One or both sides of the o-ring appear rough and slightly flattened. Commonly caused by a contact surface that it too rough, contains grit or is too smooth to allow lubrication. Over Compression - O-ring is flattened on both sides and may have a "ring" split along its length. Commonly caused by excessive pressure or heat. Heat Hardening - O-ring has a pitted or cracked surface, and often is flattened on both sides. Caused by temperature exceeding o-ring capacity. Weather/Ozone Cracking - O-ring is covered in small surface cracks. Caused by exposure to ozone, UV rays and air pollution. Excessive seal stretching causes similar cracking.
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★★★★★
★★★★★
fits perfect, n. gun works
Arrived very fast, i would say faster came from US to my state in EU, than post in my state to me :)
Iglobal - May 23, 2019
Verified Purchase
★★★★★
★★★★★
easy to install with tool that was supplied
part fit Great and works fine. good place to find the parts you need. Quick shipping!!
Guest - August 28, 2019
Verified Purchase
★★★★★
★★★★★
O-ring replacement
The product arrived promptly and was package in original packet. Installation was easy and corrected problem.
Guest - September 2, 2019
Verified Purchase
★★★★★
★★★★★
Really nail gun repair
Parts are we quickly and fit perfectly.I had purchased a universal rebuild.kit for my dewalt framing gun elsewhere and finding out The hard way that there parts did not fit correctly.I purchased the correct parts from you.now my framing gun works like new saving me hundreds of dollars on having to replace the gun.thanks again
Guest - November 5, 2019
Verified Purchase
★★★★★
★★★★★
Correct
Easy to install
Guest - May 1, 2020
Verified Purchase
★★★★★
★★★★★
Easy repair
Grate condition
Guest - February 25, 2021
Verified Purchase
★★★★★
★★★★★
Correct fit and fixed my problem
Fixed my DeWalt framing nailer. After replacing all the O-rings with a different kit, the piston wouldn't fire. I replaced it with this one and solved my issue.
Guest - June 9, 2023
Verified Purchase
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I ordered the Dewalt \"O\" ring repair kit for my Nail Gun (Model # D51844) and followed the instructions included. It took about 30 to 40 minutes to replace all of the \"O\" rings and reassemble the gun. Very straight forward and easy to follow instructions. Nail Gun works fine now and I saved a considerable amount of time and money
... Read more and fixed it myself. Fast shipping and I will use them again. Thanks guys, Ron
1. Removed all Allen bolts noting locations.
2. Extracted main air cylinder firing pin.
3. Wiggled and extracted main air cylinder.
4. Replaced main cylinder O-ring.
5. Wiped down all components and inner air chamber with WD-40.
6. Greased and lubricated all seals, firing pin, and cylinder walls with a thin
... Read moregrease and pneumatic tool oil.
7. Dismantled nail magazine and lubricated track.
8. Cleaned and lubricated safety head and moving parts.
9. Cleaned and lubricated main air chamber seal.
10. Reassembled entire nailer.
11. Added a few drops of pneumatic tool oil to male air quick connect.
12. Cleaned exterior air chamber with WD-40.
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Gun stopped working. Took it apart, noticed many O-rings got over heated and stretched or ripped
Replaced stretched O-rings (from heat), Replaced Trigger Valve (from heat and dirt), Cleaned dirty oil and metal fragments out of the inside of gun. Works as brand new. Make sure to check all O rings. If any are out of place, pinched, or stretched, it will stop your gun from working.
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Nailer would discharge nails as soon as air supply was connected
1. Printed schematic to show parts orientation and location
2.Used punch to remove trigger pin and 2 spring pins holding valve in place.
3. Old trigger came right out, but had to use needle nose pliers to pull out valve. Came out in 2 parts, inner valve spring also popped out to my surprise.
4. Fitting new in took a fe
... Read morew tries, schematic helped to show orientation.
5. Back together no problem.
6. To do O rings, opened back of gun and plunger came right out. O ring change there just off-on.
7. Used 2x4 as stop to bang gun body hard to release inner workings.
8. First O ring was easy to access and find on schematic, but ring was VERY gummy, more gum than solid, scrapped off and easy replacement. But what grease to use??? None included with 2 O rings purchased, recommended grease listed for $63 for 3 oz.!!??!! Use silicone instead, but could not find any assistance on this!!!
9 Second O ring much harder to access. Had to remove spring and retainer, spring stop and slide back part. This O ring also all gum and noted 3rd O ring also gum. Had to order 3rd and now waiting for delivery. Job not done, but did reassemble, just not tighten screws.
Removed the 4 Allen screws at the top of the nailer. Removed the entire assembly in one piece. Removed the black rubber ring by pushing down on the ring and spring and remove the black keeper O ring. Replaced the two non-black O rings and then reassembled the nailer.
This part is in stock in our warehouse and will ship out within 1 business day of the order being placed.
New stock is on the way! On order parts usually ship within 7 business days.
Item is not in stock and usually ships 10-15 business days from the time you place your order.
This item is no longer being made by the manufacturer, and cannot be added to your shopping cart.
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