Part Location Diagram of 903775 DeWALT OVERHAUL KIT
See part 1000 in the diagram
( Grid squares measure 1x1 inch )

OVERHAUL KIT 903775

Manufactured by:
DeWALT
ERP Number:
ERP12502343
Part Number:
903775
Original Equipment Manufacturer ?
In Stock
Delivers in 3-5 Business Days!

Easy 

30 - 60 mins 

(15 rated repairs) ?

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Product Description

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It is an authentic OEM sourced overhaul maintenance kit that is specially supplied for Porter Cable nailers. This kit is the manufacturer recommended solution that will help to keep your nailer operating at its peak. Over time gaskets and seals may wear out and deteriorate eventually requiring replacement. Keeping an eye on your tools performance should let you know when its time to perform a maintenance repair. The kit includes all necessary replacement seals, o-rings and gaskets needed for overhauling top and bottom seals.

Frequently Purchased Together

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Troubleshooting

This part works with the following brands:
  • Porter Cable
  • DeVilbiss
  • DeWALT
This part works with the following products:
  • Nailer
Part# 903775 replaces these:
903775,

Customer Part Reviews

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4.9
Average Rating (out of 5):
★★★★★
★★★★★
(8 Reviews)
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    7
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    1
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Questions & Answers

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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.

Easy 

30 - 60 mins 

(15 rated repairs) ?
  • 1
  • 2
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Wore out after10 years

Fred from Empire, Alabama

15 of 15 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Tools:
Screw drivers
Parts Used:
903775
Remove the top cap of the nail gun
Clean the inside of the gun
Follow the installation directions included with the kit
Install the parts
Replace the top cap
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Porter Cable BN-125A nailer leaking air from top and not throwing nails.

Max from McKinney, Texas

7 of 7 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
30 - 60 mins
Parts Used:
903775
I used a video on eReplacementparts.com and the Porter Cable assembly drawing that came with the kit as a guide. It was good, but short on details with regard to the head/vent assembly, which turned out to be the source of my leak. I had trouble getting that spring loaded piston out because it was galled in there by a deteriorated o-rin g. And when I put it back in, it stuck again. So it would be helpful to put in some better instruction on getting that piston out, redressing the cylinder surface, and reinserting the piston, making sure it moves up and down against the spring. All told, a successful repair job and very satisfied with the purchase.
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Would not fire

James from Helotes, Texas

7 of 7 people found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
30 - 60 mins
Parts Used:
903775
Dissemble and placed on work table the way it came out. Cleaned parts and then replaced with new parts. Then reassemble. Connect to air and it fired.
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leaking air through top of unit

Rex from Maysville, Georgia

6 of 6 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Parts Used:
903775
Disassembled unit and replaced each part as per instructions.
Although I only needed the top seal, I think it is wise to do the complete rebuild.
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Not sinking nails

Carl from Denham Springs, Louisiana

3 of 3 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Parts Used:
903775
Followed the included instructions that came with the kit. It\'s like a new gun again.
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After 13 years of use nail gun was worn out

James from Wanaque, New Jersey

2 of 2 people found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
15 - 30 mins
Parts Used:
903775
1. Purchased over haul kit
2. Disassembled nail gun
3. Swapped worn parts, reassembled nail gun
4. Works like new.
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Air blowing from top when trying to staple

Phil from Nipomo , California

1 person found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
30 - 60 mins
Parts Used:
903775
Make sure you take pictures of your steps. One gasket has high ridge on one side you could put in backwards if not observant. Instructions for first timers on taking out cylinder was a utuber look up, and actually saw how it was done then it was easy. Very quick delivery to my surprise, I needed it and got it.
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Leaking air

Craig from JENISON, Michigan

1 person found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
30 - 60 mins
Tools:
Wrench set
Parts Used:
903775
Total teardown, lots of debris inside from seals that deteriorated.just followed the breakdown included w tool
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Would not fire

Tom from SOMERVILLE, Alabama

1 person found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Parts Used:
A00972, 897554, 884443, 903775
Replaced the parts with those in the rebuild kit, also while cylinder was out replaced it. Followed the instructions in the overhaul kit.
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Exhaust cap broke

Brian from Makawao, Hawaii

0 of 1 people found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
30 - 60 mins
Tools:
Pliers, Screw drivers
Parts Used:
903775
Replaced cap and changed seal and orings
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  • 1
  • 2