Overview
This replacement piston driver is manufactured to OEM specifications for pneumatic and battery-powered nailers. A worn piston driver is one of the most common causes of inconsistent nail depth and tool jams. Swapping in a new driver assembly is a cost-effective repair that extends the working life of your nailer significantly.
Key specifications
- Aftermarket piston driver assembly
- Direct OEM-equivalent replacement
- Includes 2 piece(s) per package
- Includes o-ring(s) for proper cylinder seal
- Precision-machined for consistent nail depth
Compatibility
This piston driver is designed to fit Hitachi nailers as specified in the compatibility listing above. Always cross-reference the full model and type number stamped on your tool’s nameplate before ordering.
Installation notes
Always depressurize the nailer and disconnect power before servicing internal components. Access the piston driver by removing the cylinder end cap and nose assembly. Apply a light coat of pneumatic oil to the replacement driver’s o-ring before reassembly to ensure a good seal from the first shot.
Common questions
Q: Will this 877323 piston driver fit my Hitachi NR83A2, or is it only for the NR83A5 and NR83A5S models?
Yes, this piston driver is made to fit several Hitachi pneumatic framing nailers, including NR83A2, NR83A, NR83A3, NR83A5, NR83A5(S), NR83A5S, and NR83A5M. It is intended as a replacement for the SP 877-323C piston driver kit, so matching your model number to that list is the best way to confirm fitment.
Q: Does this 2-piece 877323 kit include everything needed to replace a worn driver in my NR83A5M nailer?
This 2-piece set is for the piston driver components only, so it is meant to replace the worn driver assembly parts in compatible NR83A5M and related models. Before installation, inspect the cylinder, bumper, and driver blade area as well, because excessive wear in those parts can cause the new piston driver to fail prematurely.
Q: What maintenance should I do when installing this piston driver in a Hitachi NR83A3 framing nailer?
When installing it in an NR83A3, clean out the cylinder and nose area thoroughly and check for cracks, burrs, or debris from the old driver. It is also a good time to inspect the O-rings and bumper and apply the correct pneumatic tool lubrication so the new piston driver cycles smoothly and lasts longer.
