*This part replaces obsolete part #: 894747.
Product Information
Description:
O-rings are designed to contain thousands of pounds of pressure by creating a seal between two or more parts. O-ring measurements are defined by the inside diameter and the thickness. There are many causes for O-Ring failure, such as pressure, friction, temperature or chemicals. The most common are: |
Frequently Purchased With
Compatibility
This part is compatible with the following machines:
the 10 compatible machines
Products Compatibility
This item works with the following types of products:
- • Nailer
- • Stapler
Questions & Answers for O-ring
I have a PC finish nailer (model DA250B). Upon removing the top cap (secured by four black screws) I turned it over and found that there is a plastic seal (nearly clear) that broken (did not need to remove any other parts to see this seal/ring). Which part number is this? (904749 ?). Thank you.
Ward
for model number DA250B
asked on 2022-04-25
Hello Ward, Thank you for contacting us. We have researched the model you have provided and have found the part you are looking for is Part Number: 904749. 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 April 25, 2022
Repair Instructions: Submitted by Customers Like You
22 of 23 people found this instruction helpful
Tool Type:
Stapler
Parts Used:
Repair Difficulty:
Easy
Time Spent Repairing:
Less than 15 minutes
Tools Used:
, allen wrench
I was using the stapler when suddently there was a large air leak from the gun. .
I used an allen wrench to open the stapler (removed the 4 retaining screws) and found an obviously broken/shattered o-ring. I looked for a replacement part on the website and ordered it. The replacement was easy. My only suggestion would be to absolutely clean out any remaining o-ring parts in the stapler prior to re-installing the new o-ring. Once the new o-ring is seated, it's very difficult to remove it to allow you to remove any bits of the old o-ring that are still left.
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13 of 14 people found this instruction helpful
Tool Type:
Nailer
Parts Used:
Repair Difficulty:
Easy
Time Spent Repairing:
Less than 15 minutes
Tools Used:
, Allen wrench
Sudden fail in nailer with constant heavy air leaking from the top rear crown area. Result was not enough pressure to fire the nailing pin.
Glove up. (Nitrile/Latex)
Carefully removed crown cap via 4 allen screws being mindful not to allow the spring load to force and further damage.
Inspect piston chamber for wear and adequate oiling.
Remove piston cap and O ring. (probably yellow to orange in color)
Thoroughly clean all exposed areas and RE oil.
Firmly place new O ring in place. Working with one finger around the groove while holding one side down with a thumb. It wont look like it suppose to fit, but it does.
To make things easier, you may want to completely pull the piston cap off of the crown cap.
Keep in mind the additional O rings, and placements.
Once in place, properly and moderately oil with suitable tool oil and gently push back into place while hand tightening the screws back into place.
1/8 to 1/4 turn past hand tight should be sufficient to reseal the crown into place.
Test at 30 psi and gradually increase to confirm seals before testing the firing pin.
Few more drops of oil into the chuck load and you should be complete.
Recommend full replacement of O rings and thoroughly cleaning entire unit during this repair. Highly likely all rubber O rings are failing and could probably use a blunt file to the firing pin.
Afterward it will feel like a BRAND NEW TOOL for under 20 bucks. Certainly is better than having to buy a new one at over 100!!!
Carefully removed crown cap via 4 allen screws being mindful not to allow the spring load to force and further damage.
Inspect piston chamber for wear and adequate oiling.
Remove piston cap and O ring. (probably yellow to orange in color)
Thoroughly clean all exposed areas and RE oil.
Firmly place new O ring in place. Working with one finger around the groove while holding one side down with a thumb. It wont look like it suppose to fit, but it does.
To make things easier, you may want to completely pull the piston cap off of the crown cap.
Keep in mind the additional O rings, and placements.
Once in place, properly and moderately oil with suitable tool oil and gently push back into place while hand tightening the screws back into place.
1/8 to 1/4 turn past hand tight should be sufficient to reseal the crown into place.
Test at 30 psi and gradually increase to confirm seals before testing the firing pin.
Few more drops of oil into the chuck load and you should be complete.
Recommend full replacement of O rings and thoroughly cleaning entire unit during this repair. Highly likely all rubber O rings are failing and could probably use a blunt file to the firing pin.
Afterward it will feel like a BRAND NEW TOOL for under 20 bucks. Certainly is better than having to buy a new one at over 100!!!
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6 of 6 people found this instruction helpful
Tool Type:
Stapler
Parts Used:
Repair Difficulty:
Easy
Time Spent Repairing:
Less than 15 minutes
Tools Used:
, Allen Wrench
Stapler would not activate, there was an air leak.
Remove the top cap, exposing the underside of the piston set-up. The damaged o-ring was obvious, and the new o-ring slid easily into place. Replace the top cap and tighten the screws evenly.
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2 of 2 people found this instruction helpful
Tool Type:
Nailer
Parts Used:
Repair Difficulty:
Easy
Time Spent Repairing:
Less than 15 minutes
Tools Used:
, Allen Wrench
Air blowing out the top of the gun
Removed four allen screws removed damaged o-ring and put back together. Very easy repair. The advantage of using e-replacement is the online diagnosis.
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2 of 2 people found this instruction helpful
Tool Type:
Nailer
Repair Difficulty:
Easy
Time Spent Repairing:
15-30 minutes
Tools Used:
, Allen Wrench
O-Ring split, caused by over pressure.
1. Removed top 4 screws.
2. Remove o-ring and debris
3. oil internal components
4. replace o-ring and gasket
tighten screws tight
2. Remove o-ring and debris
3. oil internal components
4. replace o-ring and gasket
tighten screws tight
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1 of 1 people found this instruction helpful
Tool Type:
Nailer
Parts Used:
Repair Difficulty:
Easy
Time Spent Repairing:
15-30 minutes
Tools Used:
, Allen wrench
Leaking air
Removed the for screws from the housing cap, and removed it
Removed the worn o-ring and installed the new one
Cleaned the inside of the nail gun & oiled it
Screwed the housing cap back on
Removed the worn o-ring and installed the new one
Cleaned the inside of the nail gun & oiled it
Screwed the housing cap back on
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1 of 1 people found this instruction helpful
Tool Type:
Nailer
Parts Used:
Repair Difficulty:
Easy
Time Spent Repairing:
15-30 minutes
Tools Used:
, Allen wrench
O-ring broke.
1. Removed top of nail gun.
2. Replaced o-ring.
3. Replaced top of nail gun and tested it. Worked perfectly.
2. Replaced o-ring.
3. Replaced top of nail gun and tested it. Worked perfectly.
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Tool Type:
Nailer
Repair Difficulty:
Easy
Time Spent Repairing:
15-30 minutes
Tools Used:
, Allen wrench
Porter Cable BN200A Air Nailer, would not fire - massive internal air leak
Removal of the cap (4 internal hex cap screws) revealed a broken O-ring. There was a gasket under the cap. I ordered the most likely parts to wear or leak. No other tools were required to disassemble enough to replace the piston seal, and another O-ring in the cap. I lubricated the O-rings and piston seal with Vaseline. After reassembly, the nailer performed like new.
Big endorsement for ereplacementparts.com. They had the parts to keep this tool in operation.
Big endorsement for ereplacementparts.com. They had the parts to keep this tool in operation.
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Tool Type:
Nailer
Parts Used:
Repair Difficulty:
Easy
Time Spent Repairing:
Less than 15 minutes
Tools Used:
, Allen wrench
Air coming out the top
Pulled top off removed the broken o-ring replace with the new one, put everything back together.
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Tool Type:
Nailer
Parts Used:
Repair Difficulty:
Easy
Time Spent Repairing:
Less than 15 minutes
Tools Used:
, Allen wrench
Leak air from top.
Remove four screws, top head , replace old broken o-ring.
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Reviews
55 Reviews
Average Rating (out of 5):
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5 stars
46
4 stars
6
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1 stars
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Easy repair
Right part easy to replace
Guest -
December 14, 2023
Verified Purchase
perfect
perfect fit
Terrence W. -
September 18, 2023
Verified Purchase
porter cable air tool.
the O-ring for my T-Nailer gun went bad, Replacement Parts had the O-ring. So i can keep my T-Nailer for twenty more years.
Guest -
September 14, 2023
Verified Purchase
Crown staple repair
Part arrived quickly and fit perfect in my crown stapler, will buy from again if in need of parts
Guest -
August 19, 2023
Verified Purchase
Fixed
Easy fix, got me up and running again thanks e replacement parts.com
Guest -
May 27, 2023
Verified Purchase
What I needed, when I needed it.
Perfect part, easy to find, quick delivery.
Guest -
February 20, 2023
Verified Purchase
A perfect replacement
This part along with a couple of O-rings fixed my staple gun like new. My air tools are getting old, like me, and parts wear out or Sub come to drying out, that's what happened to my, tool. As I stated any tool can be repaired with the correct part, eReplacementParts is the Goto for those parts!!
James -
January 11, 2023
Verified Purchase
Easy repair
Part arrived as scheduled. Fit perfectly and seems to have solved the problem. Would not hesitate to order more parts if needed. Thanks for the great service.
Guest -
December 26, 2022
Verified Purchase
Simple
Whole replacement process took 5 minutes. Product came quickly. Especially liked links to how to pages
Guest -
November 1, 2022
Verified Purchase
great service
I was able to repair my staple gun easily and cheaply. Great service and parts for my porter cable staple gun. Thank you.
james -
October 22, 2022
Verified Purchase
Verified Purchase
eReplacementParts Team
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Product Information