GH-7A NPK GH-7A Specifications & Technical Data (2011—2026)

The most extensive line of hammers for excavators

These rugged hammers, with shock-absorbing mounting systems, are capable of high production rates in all forms of concrete as well as medium and hard rock. These hammers feature a compact design and a long piston stroke coupled with greater hydraulic efficiency, enabling small carriers to deliver a high impact, highly productive hammer. In addition, the New "GH" Series Hammers come equipped with separate ports for the NPK AutoLube system and an air line for underwater applications. Low operating noise levels that are friendlier to both operator and community are achieved by special cushioning and the bracket design surrounding the hammer.

A better design that combines EFFICIENCY RELIABILITY SERVICEABILITY

Excellent power-to-weight ratio. Unique gas-charged piston maximizes hammer efficiency. Simple, two-moving-parts design for reliability. Idle blow sensor virtually eliminates blank firing for long hammer life. Separate ports for the NPK Auto Lube system and an air line for underwater use. Bottom tie rod nuts for easier serviceability (GH Models). Quick-change tool system with single round retainer pin. Variety of tool configurations available. Replaceable cylinder sleeves for easy, economical rebuild. Tool bushings engineered for quick, easy replacement.

Full SERVICEABILITY of the industry’s easiest, lowest cost, body-rebuild system

Hammers aren’t meant to have an easy life. They occasionally need to be rebuilt. When the hammer body is involved, NPK’s replaceable sleeve design can reduce your costs by a factor of five to ten. Here are the typical costs involved to re-sleeve the body of an NPK hammer and replace the main body of a hammer from another major manufacturer.

Simplified lubrication for greater RELIABILITY

A grease port is provided for automatic and/or manual greasing of the demolition tool. This prevents damage or premature wear caused by a lack of grease.

Vibration Control

Standard on all medium and large NPK hammers, our shock-absorbing mounting bracket uses special heavy duty rubber mounts to absorb shock, recoil, and impulse vibration. Their unique one-piece design eliminates the need for mechanical springs and overly heavy mounting brackets. The net result is that you minimize machine wear and improve operator comfort for greater reliability and productivity.