Diagnosing a Power Hammer Fault in the Field: A Real Case Study

When Problems Don’t Show Up Straight Away

Not every issue with a power hammer appears immediately. In many cases, a machine will run perfectly for weeks or months before something changes. That change might come after a move, a period of downtime, or for no obvious reason at all.

This case is a good example of how a problem can develop gradually, how misleading the symptoms can be, and what it actually takes to diagnose and resolve it properly.

The Machine and the Move

In mid-2025, we supplied a 40kg (88 lb) Anyang ST power hammer to a customer, Tony, based in Colorado. Like most new owners, he got straight to work, using the hammer for light forging while getting familiar with it.

A few months later, everything changed. Tony relocated his workshop roughly 30 miles away. What might sound like a simple move was anything but. He had been in the same location for around 30 years, so this meant building a new shop environment from the ground up. 

Eventually, the new shop came together and the hammer was set back up.

A Subtle Problem Appears

Not long after getting back up and running, Tony noticed something unusual. After a short period of light forging, he left the hammer idling and heard a distinct clanking sound with every cycle.

He reached out with a clear description. The machine had only around 15 hours of use, everything had been greased and maintained, and there had been no obvious change in how it was set up. 

Why Diagnosis Wasn’t Simple

From the outset, there were a few challenges. The reported location of the noise didn’t align with any obvious fault points, everything externally appeared to be in order, and the issue only presented itself during operation.

We began with remote troubleshooting. Tony worked through everything methodically, checking key components one by one. The usual suspects were ruled out: fasteners, flywheel, connecting rods, bearings. Nothing pointed to a clear cause.

What made things more difficult was that the sound seemed to travel through the frame, making it appear as though it was coming from the back of the machine at times, even though there was no supporting evidence for that.

At that point, it became clear that this wasn’t something that could be confidently diagnosed from a distance.

Getting Eyes on the Machine

To move things forward, we sent one of our field technicians, Jackson, to inspect the hammer on site.

This is often the turning point in situations like this. Certain issues only reveal themselves when the machine is observed under real operating conditions, with the ability to isolate components directly.

In this case, the fault was internal.

The hammer uses a two-piece piston design, and the central section had shifted slightly upward over time. Under operation, this caused it to make contact with the cylinder head. Each cycle produced a knock, and because of how the force travelled through the frame, the sound was projected to a different area of the machine entirely.

The Fix

Once the root cause was identified, the repair itself was relatively straightforward. The displaced piston section was driven back into its correct position, restoring proper alignment within the assembly.

To prevent the issue from recurring, the joint was then secured mechanically. Two set screws were drilled and tapped on opposing sides, locking the components together and eliminating the possibility of further movement.

With that, the problem was resolved.

The Outcome

With the correct diagnosis, the fix was quick and effective. The hammer returned to normal operation, and Tony was able to continue working without further issues.

His feedback afterwards said it best:

“Well the issue is resolved thanks to George Spooner at PowerHammers.com and his tech Jackson. At George’s expense, he sent Jackson to find my issue. That, people, is caring about your customers. PowerHammers.com is a great company. Thank you.”

What This Case Shows

Situations like this highlight something that isn’t always obvious when buying machinery. The challenge is rarely just the machine itself. It’s what happens when something doesn’t behave as expected.

Small internal shifts can create symptoms that are difficult to interpret. Noise can be misleading. And even with a well-built machine, diagnosing faults remotely has its limits.

Having access to proper support, and the ability to escalate from remote troubleshooting to hands-on inspection when needed, makes a significant difference.

Final Thoughts

This wasn’t a major mechanical failure. In fact, the machine itself was fundamentally sound. What caused the issue was a small internal movement that created a disproportionately confusing symptom.

Without proper diagnosis, it could easily have led to unnecessary part replacements or ongoing frustration.

Instead, it was identified, resolved, and prevented from happening again.

If you’re experiencing something similar, or you’re simply not sure what you’re hearing from your machine, it’s always worth addressing it early. A short conversation can often point things in the right direction before it becomes a bigger issue.