How to Identify a Hydraulic Hammer from Its Make, Model and Data Plate

Before anyone can quote a replacement chisel, a seal kit, or a like-for-like replacement hammer, they need to know exactly which hammer you have. "A yellow breaker on our 8-tonner" is not enough. The good news: in most cases the hammer itself tells you, through its data plate, a few measurements, and the way it is mounted.

This guide shows contractors, fleet managers, and dealers how to identify a hydraulic hammer (breaker) from its make, model, and data plate, what to do when the plate is gone, and which photos and numbers to send so a supplier can confirm fitment the first time.

Definitions

• Hammer / breaker — the hydraulic percussion attachment on the excavator. The terms are used interchangeably.
• Data plate (type plate) — the manufacturer's identification plate, usually riveted or screwed to the housing or the top bracket.
• Working tool (chisel) — the replaceable steel tool at the bottom: moil point, flat chisel, blunt tool, and so on.
• Top bracket (mounting) — the interface between hammer and excavator: a quick-coupler plate or a pin-on bracket.
• Carrier — the excavator or other machine the hammer runs on.

Step 1 — Find and read the data plate

Look on the side plates of the housing first, then on the top bracket and around the upper part of the power cell. On box-type (silenced) hammers the plate is normally on the outer housing; on open or side-plate designs it can sit on the side plate or the body itself. Clean it before you photograph it. Paint, grease, and impact marks hide digits.

A typical plate shows some or all of the following:

• Manufacturer and model or type designation
• Serial number
• Year of manufacture
• Operating weight of the hammer
• Operating pressure range and required oil flow range
• CE marking on machines placed on the EU market

The model plus serial number is the most valuable pair. The model tells you the size class and parts family; the serial tells a supplier which production version you have, which matters when seals, bushings, or tool retainers changed during a model's life.

Step 2 — If the plate is missing or unreadable

Plates fall off, get painted over, or are removed when a hammer changes hands. You can still build a reliable identification from the hammer itself:

• Stamped or cast numbers. Many makers stamp a serial or part number into the body, front head, or cylinder. Check flat machined faces and around the tool retainer area.
• Working tool diameter. Measure the chisel shank diameter with a calliper where it enters the front head, and note the overall tool length. Diameter is one of the strongest size-class indicators.
• Tool retention. Count the retaining pins and note their shape. Retention design differs between makers and model generations.
• Overall dimensions. Housing length and width, and the hammer weight if it has ever been weighed.
• Hydraulic ports. Note the number of ports and the thread or fitting type on the pressure and return lines.

None of these alone identifies a model with certainty. Together, plus photos, they usually narrow it to one family, and an honest supplier will tell you when they cannot.

Step 3 — Identify the mounting

The mounting decides whether a replacement hammer bolts straight on. Note which of these you have:

• Quick coupler — S-type (S40, S50, S60, S70), OilQuick, Lehnhoff, or another system. Photograph the coupler plate and note the size marking.
• Pin-on — measure pin diameter, pin centre distance, and the inside width between the bracket ears. These vary by excavator make and year, so measure rather than assume. Our coupler and pin-on fitment guide shows how.

Our guide to finding the right hammer explains how tonnage and coupler together narrow the choice.

Step 4 — Record the carrier, not just the hammer

The excavator model does not tell you which hammer is fitted, because one carrier can run hammers from many makers. But the carrier still matters for fitment and hydraulics. Record:

• Excavator make, model, and serial or year (from the machine's own ID plate)
• Operating weight as actually configured
• Auxiliary hydraulic flow and pressure settings, if known
• Whether the return line goes directly to tank

The photo set that saves a week of emails

Send these six photos with your enquiry and most identifications can be done in one reply:

1. Full side view of the hammer
2. Close-up of the data plate (or the area where it used to be)
3. Working tool with a tape measure or calliper showing the diameter
4. Front head and tool retaining pins
5. Top bracket or coupler plate, front and side
6. The excavator's ID plate

Common identification mistakes

• Ordering by colour or sticker. Hammers are repainted and rebranded. Dealer-branded and private-label hammers exist, so the decal is not proof of the maker.
• Guessing from the excavator class. An 8 t carrier might run a light, medium, or oversized hammer depending on the previous owner.
• Skipping the serial. Two hammers with the same model name can need different seal kits.
• Measuring a worn tool at the tip. Measure the shank, not the worn point.

FAQ — identifying a hydraulic hammer

Where is the serial number on a hydraulic hammer?

Usually on the data plate on the housing or top bracket. Many makers also stamp it into the body or front head, so check machined faces if the plate is missing.

Can I identify a hammer from the chisel diameter alone?

It gives you the approximate size class, not the exact model. Combine it with tool retention, dimensions, mounting, and photos.

The excavator came with the hammer. Does the excavator's serial identify it?

No. The hammer has its own plate and serial. The excavator details are still needed for mounting and hydraulic settings.

Do you sell parts for every hammer brand?

No. Thunderline OÜ is an aftermarket dealer, not an OEM, and brand names are used only to describe fitment. Send the details above and we will tell you plainly whether we can match it.

Next step

Have the plate photo and measurements ready? Request a fitment check for a new hammer, or email hello@thunderline.eu with the photo set for an identification and quote. More buyer guides are on our Guides page.