Plunger O-ring 874820

Description:

Genuine Hitachi replacement part, this item is sold individually.
This O-Ring is installed on the plunger of the tools shown below.
It acts as an air seal to prevent an air leak.
Over time O-Rings will be come brittle and stretched.
When this happens it is time to replace this item
It is also time to inspect the other O-Rings in the tool for wear also.

Frequently Purchased With

O-ring
$3.99

Valve Packing..
$4.99

Urethane Ball..
$3.99

Trigger Plunge..
$5.19

Trigger Valve ..
$9.49

O-ring
$4.99

Valve Plate
$4.99

Plunger Spring..
$4.99

Compatibility

This part is compatible with the following machines:

Metabo HPT (Hitachi)

NR83AA3 Clipped Head Framing Nailer
NT65A3 16-Gauge Finish Nailer
NV45AB2 Side Load Coil Roofing Nailer
NV45AB2(S) Bottom Load Coil Roofing Nailer
NV45AE 1-3/4" Side Load Coil Roofing Nailer
NV65AC Coil Pallet Nailer
NV83A2 Full Round Head Coil Nailer
VH650 Full Head Coil Fencing Nailer
NV50A1 Light-Duty Coil Utility Nailer
NV50AA Light-Duty Coil Utility Nailer
N5008AC/P 7/16" 1" - 2" x 16 Gauge Standard Crown Stapler
N5010A 1/2" Standard Crown Stapler
N5021A 15/16" Wide Crown Stapler
N5024A 1" Wide Crown Stapler
NV50AP2 Full Round Head, Coil, Wire Collation Pasti-Tacker Plus
NR83A2(S) Framing Nailer, Full Head, Plastic Strip Collation (without Depth Adjustment)
83AA2 Strip Nailer
N3824A .5"-1.5" Wide Crown Stapler 16Ga
N5008A1 Stapler
N5008AA Stapler
N5008AC 2" 16Ga 1"-2"Standard Crown Construction Stapler
NH451 "T" Nailer
NR83A 3-1/4" Full Head Nailer
NR83AA 3-1/4" Clipped head Framing Nailer
NR83AA2 3-1/4" Clipped head Framing Nailer

Expand the 49 compatible machines

Products Compatibility

This item works with the following types of products:

• Nailer
• Stapler

Repair Instructions: Submitted by Customers Like You

Tool Type:

Nailer

Parts Used:

Gasket (f) - 877329

Gasket (a) - 877334

Valve Packing - 888151

Plunger O-ring - 874820

Roll Pin D3x30 (10 Pcs.) - 949866

Exhaust Valve - 890209

Gasket (c) - 877326

O-ring Overhaul Kit - 18000M

Repair Difficulty:

Medium

Time Spent Repairing:

1-2 hours

Tools Used:

, allen wrench set, O ring pic, 8mm wrench, hammer, punch.

framing nailer was leaking air when connected to air hose

Dismantled entire gun piston bumper was breaking into small pieces causing air leak. I use my nail guns daily therefore when something like this happens I always do a complete rebuild, in this case the front bumper was also bad. I always allow a few hours thoroughly clean, inspect and rebuild everything properly to extend the time between rebuilds. recommendations: Take your time be patient, drink a beer if necessary and make it like brand new.
P.S. DO NOT REUSE OLD PARTS SUCH AS GASKETS, ROLLED PINS, ETC. CHEERS AND HAVE FUN!

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Tool Type:

Nailer

Parts Used:

O-ring - 875638

Valve Packing - 888151

Plunger O-ring - 874820

Repair Difficulty:

Medium

Time Spent Repairing:

30-60 minutes

Tools Used:

Screwdriver, punch and small hammer for roll pin

air leak at trigger

Punched out roll pin holding trigger. Not the right tool but used a hammer and screwdriver to remove the threaded piece holding the trigger apparatus. Replaced the valve packing and both o-rings and reassembled. Be careful no to lose the ball.

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Tool Type:

Nailer

Parts Used:

O-ring - 875638

Valve Packing - 888151

Urethane Ball - 890301

Trigger Valve Bushing - 877335

Trigger Plunger - 878121

Plunger O-ring - 874820

Repair Difficulty:

Easy

Time Spent Repairing:

30-60 minutes

Tools Used:

Screwdriver, Pliers

Air was leaking from the trigger.

I removed the trigger assembly and replaced broken parts
Replaced o rings.

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Tool Type:

Nailer

Parts Used:

Valve Packing - 888151

Urethane Ball - 890301

Plunger O-ring - 874820

Repair Difficulty:

Medium

Time Spent Repairing:

30-60 minutes

Tools Used:

, Allen wrenches, small punch to remove trigger drift pin

Air leaked from trigger

1) Drove trigger pin out.
2) Remove trigger assy.
3) Replaced valve packing and urethane ball and plunger o-ring

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Tool Type:

Nailer

Parts Used:

O-ring - 875638

Valve Packing - 888151

Urethane Ball - 890301

Trigger Plunger - 878121

Plunger O-ring - 874820

Repair Difficulty:

Easy

Time Spent Repairing:

Less than 15 minutes

Tools Used:

Pliers, Roll pin punch & brass hammer

The trigger would no longer worked

I punched out the trigger roll pin with a roll pin punch of the correct diameter
Removed the trigger and plunger assembly after loosening the trigger valve nut with adjustable pliers gripping the outside of the nut since I didn't have a spanner type tool that would fit the slot in the top of the nut
Replaced the urethane ball, trigger plunger and installed the new O-rings and valve packing
Re-installed the plunger assembly and trigger and tapped the roll pin back in place
Put the air hose on the tool and successfully fired about 7 16d nails into a piece of wood
Works like new again

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perfect fit

Fits well. Great interactive site and easy to find parts. 4 stars instead of 5 because it seems all o-ings are priced at $2.99 no matter what size or function. I say this because O-Rings in a hardware store run around 89 cents. Yes i know size, performance and convenience matter not all orings are the same. How special can these O-rings be. You asked.

Mark - March 12, 2022 Verified Purchase

Verified Purchase

eReplacementParts Team

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Questions & Answers for Plunger O-ring