Medium
30-60 minutes
This is an authentic OEM part. The 'c' gasket is made for use with several nailer devices. Constructed of metal, this item is fitted between the exhaust piece and the exhaust valve, providing protection from friction. This component is sold individually. A hex key is required for the installation. Please refer to the manual for further repair instructions.
Gasket C 877854
OEM part for: Metabo HPT (Hitachi)
Part Number: 877854
$4.99
In Stock
Ships within 1 business day 
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Compatibility
This part will fit the following 25 machines
Metabo HPT (Hitachi)
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Show More Compatible Models
This item works with the following types of products:
- Nailer Parts
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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 Hitachi nailer NR83A2 (S) would not drive nails all the way in.
Tarael - November 8, 2020
Tool Type
Nailer
Difficulty
Hard
Time
More than 2 hours
Tools Used
Wrench Set, Metric Allen wrench set
Not knowing what I would need before I tore it apart - I ordered a "complete" O-ring set from ebay because it was not available on ereplacementparts.com. It contained all of the orings for the lower part of the gun, and the nylon trigger ball, but not the exhaust on the top. I completely disassembled the gun including the trigger assembly with the exception of the top exhaust head. There were more than 20 o-rings to replace and lube inside. I found two damaged or broken but replaced them all. When it was re-assembed it still did not drive nails all the way. So I took apart the exhaust section and found the exhaust valve cracked and broken. I ordered this and the two gaskets from ereplacementparts.com and replaced them when they came. Now it works fine.
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Nailer was 27 years old and I decided to change the piston and driver as it some times jammed
Jonathan - October 24, 2019
Tool Type
Nailer
Difficulty
Easy
Time
1-2 hours
Tools Used
Socket set, allen wrench
1. Removed top cover exhaust valve screws
2. Removed cylinder head
3. Removed nail feeder (also replaced)
4. Cleaned and reassembled.
5. It is not necessary to remove the top cover for this job.
2. Removed cylinder head
3. Removed nail feeder (also replaced)
4. Cleaned and reassembled.
5. It is not necessary to remove the top cover for this job.
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Internal plastic parts & O rings plus gaskets disintegrated
RON - October 9, 2018
Tool Type
Nailer
Difficulty
Easy
Time
15-30 minutes
Tools Used
, Allen wrench
Removed all screws
Removed head
Removed piston
Changed out o rings
Cleaned up gasket surfaces,.
Installed new parts
Added oil and tested gun.
Removed head
Removed piston
Changed out o rings
Cleaned up gasket surfaces,.
Installed new parts
Added oil and tested gun.
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Nail gun was not sinking nails and air started to leak from gaskets. The piston bumper had broken to pieces and the gaskets had worn out.
Jose - May 20, 2018
Tool Type
Nailer
Difficulty
Medium
Time
30-60 minutes
Tools Used
Pliers, Power Drill, Socket set, Wrench Set, Nutdriver
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Nailgun leaked air.
Carlos - January 30, 2018
Tool Type
Nailer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Pliers, Wrench Set, Scraper blade
Took apart and replaced the parts. Reassembled.
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Air leak in upper chamber of air nailer
James - October 27, 2017
Tool Type
Nailer
Difficulty
Easy
Time
15-30 minutes
Tools Used
, Allen wrench, putty knife and air compressor
Removed exhaust cover and exhaust piece
Removed old gaskets and clean housing and piece of damaged gaskets
Replaced new gaskets and exhaust valve part #884-110
Replaced Head Cap and gasket
Reinstalled all parts and exhaust cover
Removed old gaskets and clean housing and piece of damaged gaskets
Replaced new gaskets and exhaust valve part #884-110
Replaced Head Cap and gasket
Reinstalled all parts and exhaust cover
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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.
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