This is a Genuine OEM replacement part used on some Dewalt Nailers and Staplers. This item includes a new valve and o-rings. If your tool is leaking air or the trigger valve is stuck, replacing this part may resolve the issue.
Trigger Valve Assembly N566148
OEM part for: DeWALT
Part Number: N566148
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Compatibility
This part will fit the following 42 machines
DeWALT
This item works with the following types of products:
- Nailer Parts
- Stapler Parts
This part replaces obsolete part #: 647956-00, 641011-00, 395510-00
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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 Nail gun failed to fire, tried all the recommendations online to determine reason, Trigger valve failure was the top rated reason.
Tool Type
Nailer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
, Nail to punch out the roll pins
Parts Used
2. Set the trigger and spring aside.
3. Use a straight punch OR take a nail the diameter of the two spring pins that hold the valve in place, grind the end of the nail flat. Gently tap the two pins out, NOTE they are different lengths.
4. Pull the trigger valve assembly out of the gun frame, Mine separated and required long nose pliers to pull the second half of the assembly out.
5. Inspect the empty hole for dirt and or debris, clean as needed.
6. Take the new valve assembly and use a light touch of Vaseline on the two rubber "O" rings just to help them insert in the frame. Caution do not block the air gaps in the valve system, just a light touch of lube to help assembly.
7. Orient the gray safety lever in the correct position and insert the valve assembly into the gun frame. align the two notches so the spring pins will slide in place.
8. Insert the spring pins Long and Short in the correct holes, tap them in until evenly seated. (same amount showing on both sides)
9. Place the trigger and spring back into position and push the hinge pin in making sure it engages the safety bar (this should not have moved but if it did make sure it is back where it belongs so the hinge pin keeps it in place).
10. Place the retaining rubber washer on the end of the hinge pin and you're back in business
Nailer was shooting air out of the trigger and not nailing.
Tool Type
Nailer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
, A nail and a hammer to pop the pins out. Easy
Parts Used
Pulled trigger out, slid the new trigger in and pushed the 2 pins back in and DONE. Works like new.
Misfire- hammer wouldn't retract
Tool Type
Nailer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver, punch
released latch,removed screw from contact tip,installed new contact tip
Nail gun quit firing. Large amount of air coming out of trigger valve
Tool Type
Nailer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Pliers, Nail and hammer to punch pins out
Parts Used
Nail gun quit firing
Tool Type
Nailer
Difficulty
Medium
Time
15-30 minutes
Tools Used
, Small hammer and small punch
Parts Used
Nailer was leaking air through the trigger mechanism when the trigger was pulled.
Tool Type
Nailer
Difficulty
Medium
Time
15-30 minutes
Tools Used
Parts Used
2. Removed the trigger valve assembly by pushing out the two locking pins and pulling the valve out of the housing. I used an Allen wrench similar in size to the pins to drive the pins out of the housing.
3. Reversed the procedure to install the new trigger valve assembly.
Nailer was tested and works like a new one.
Air leak when the trigger was pulled
Tool Type
Nailer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Pliers, Punch to remove pins
Parts Used
2. Installed new trigger valve assembly.
3. Installed two pins to hold the trigger valve assembly in place.
4. Installed the trigger.
5. Connected air hose, tested it and my nailer is back in operation.
Wont fire and air coming out of trigger area
Tool Type
Nailer
Difficulty
Easy
Time
15-30 minutes
Tools Used
, Punch, hammer and small screw driver
Parts Used
Air leaking from nose and from trigger valve
Tool Type
Nailer
Difficulty
Medium
Time
1-2 hours
Tools Used
Screwdriver, Pliers, ALLEN WRENCH SET
My Dewalt coil roofing nailer, model D51321 was misfiring more often then the drive pin started not retracting.I considered buying a new one.
Tool Type
Nailer
Difficulty
Easy
Time
1-2 hours
Tools Used
, Allen wrench
I will look to them again for quality replacement parts that fit,when I do the next repair.
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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.
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