How to Read a Machine Data Plate & Serial Number: JCB, Caterpillar, Case and Komatsu

1. Why the serial number matters more than the model name

"JCB 3DX" or "Komatsu PC200" tells you the model line, but not the production year, engine variant, or which of several running design changes the specific machine has. Manufacturers revise cylinder dimensions, hydraulic pump specifications and structural components within a single model's production run — our guide on identifying the correct JCB 3DX seal kit by year covers exactly this problem for one part family. The machine's serial number (sometimes called the Product Identification Number, or PIN) is what actually pins down which version of the machine you have.

2. Where to find it

3. What the serial number tells a parts desk

• Production era — which design revision the machine belongs to, which is what actually determines fitment for many components (cylinders, hydraulic pumps, some structural parts).
• Factory-fitted configuration — some machines were built with optional variants (different engine outputs, different hydraulic circuits) that share a model name but not every part number.
• Whether a part has since been superseded — manufacturers periodically revise a part's design and issue a new reference; knowing the machine's exact production date helps a parts desk confirm which version applies.

4. If the plate is missing or unreadable

This is common on older machines, especially after years of outdoor use or a repaint. In that case: check the chassis stamp near where the plate would have been mounted, check the engine block separately, and if neither is legible, describe the machine as precisely as possible (approximate purchase year, engine type if known, any visible casting numbers on major components) — a parts desk can often narrow down the configuration from that combination even without a clean serial number.

5. Why this matters before you place an order

Quoting a part against the model name alone is how the wrong seal kit, pump or pivot pin ends up shipped — a mismatch that costs both the freight and the time to source the correct one. Always quote the serial number (or PIN) alongside the part reference or description when submitting an enquiry; see our companion guide on reading JCB part numbers for how to handle the part-number side of the same problem.

6. Ordering from RRE International

Include your machine's serial number (and engine serial number, for engine/cooling parts) whenever you submit an enquiry or a Bill of Materials (RFQ) to RRE International — it's the single most useful piece of information for getting a correct-fitment quotation on the first pass, ahead of even the part number itself.

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