Easy
Less than 15 minutes
This genuine replacement piston driver assembly is sourced from original equipment manufacturer and it is designed for use with Hitachi nailers. It is the part of the nail gun that drives the nail into the material that is being used. These assemblies do have a tendency to bend or break if not used correctly or if you are driving nails into extra hard material. Includes a metal piston and the driver. Please note the o-ring is sold separately.
To help extend the life of a pneumatic tool use the specified oil in it daily 4-5 Drops will do every time you use it.
To replace this part you would only need a tool to remove o-rings.
• First you want to remove the cap
• Remove driver, and take out piston ring and o-ring
• Secure the o-ring and piston ring on new driver
• Install new driver
• Secure the cap and test the unit
Driver Unit 884643
OEM part for: Metabo HPT (Hitachi)
Part Number: 884643
Ships within 1 business day 
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Product Description ?
- Classification: Part
- Weight: 0.01 lbs.
- Shipping: Ships Worldwide
Frequently Purchased Together ?
Compatibility
This part will fit the following 1 machine
Metabo HPT (Hitachi)
This item works with the following types of products:
- Nailer Parts
Customer Part Reviews ?
Questions & Answers ?
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Does this fit my product?Questions & Answers for Driver Unit
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.
Driver unit broke
Tool Type
Nailer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Adjustable Wrench, Allen wrench
Parts Used
Remove the broken driver
Clean out cylinder
Place o-ring on the piston
Install the new driver
Replace the top cover
Broken driver
Tool Type
Nailer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Adjustable Wrench
Parts Used
pins were not fully counter sunk and the pusher was worn with burrs while the driver was split in half
Tool Type
Nailer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Pliers, Wrench Set, Adjustable Wrench
Parts Used
Hitachi 23 gauge micro pinner piston on driver split top off wouldn't hold o ring
Tool Type
Nailer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Adjustable Wrench
Parts Used
Piston wouldn't retract
Tool Type
Nailer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Adjustable Wrench
Parts Used
Removed the old driver
Installed the o-ring on the new piston
Installed the new driver back into the gun
Installed the top head cover back on
OEM stands for Original Equipment Manufacturer and means the part you’re buying is sourced directly from the manufacturer who made your product. At eReplacementParts, we sell only genuine OEM parts, guaranteeing the part you’re purchasing is of better design and of higher quality than aftermarket parts.
Our product descriptions are a combination of data sourced directly from the manufacturers who made your product as well as content researched and curated by our content & customer service teams. This content is edited and reviewed internally before being made public to customers.
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.
This data is collected from customers who submitted a repair instruction after replacing this exact part. Customers can rate how easy the repair was to complete and how long it took. We aggregate this data to provide a repair rating that allows customers to quickly determine the difficulty and time needed to perform their own repair.
