How to Identify a JCB Spare Part by Its Part Number

1. What a JCB part number looks like

Most JCB references follow a three-digit / five-character pattern, for example 320/07434, 991/00147 or 458/M1047. The block before the slash is a family/group code; the block after it identifies the specific part. Older references can be shorter or use different separators (02/200877, 15/920103), and some carry a letter (332/Y1459, 458/M1047). The number is a catalogue reference — it is not a dimension code and does not, on its own, tell you which machine or which production year the part fits.

2. Where to find the number

• On the old part. Cast, stamped or laser-etched into the component itself, or printed on the original packaging/label.
• In the machine's parts manual (the illustrated parts catalogue for your model and serial range), against the exploded diagram for the assembly you are working on.
• From your dealer's previous invoice for the same repair.
• From the machine data plate for the model and serial number — you then look the assembly up in the parts manual for that serial range.

If the number on the old part is unreadable, note the machine model and serial/chassis number and describe the assembly — that is usually enough for a parts desk to locate the reference.

3. The same part, written three ways

Buyers and stockists write the same reference differently. These are all the same part:

On RRE International product pages the primary reference is shown in the OEM slash format, with the hyphen and compact variants listed underneath as "Also written as", so a search in any style lands on the right page. When you send an enquiry, any format is fine.

4. Superseded and cross-referenced numbers

References change over a machine's life. A part first sold as one number can be superseded by a later one when JCB revises the design, and two numbers can be listed as interchangeable. If a number returns nothing, it may have been replaced — quote the number you have and the machine serial, and ask whether it has been superseded. Do not assume a visually similar part is a match; confirm the supersession in writing.

5. Verifying you have the right part before you order

1. Measure the critical dimensions of the old part — for a pin, the diameter and overall length; for a seal kit, the cylinder bore and rod diameter; for a bush, the inner and outer diameter and length.
2. Compare the description — "boom ram seal kit", "king post upper bush", "10x37 crown wheel & pinion" — against the catalogue entry.
3. Check the fitment question — engine variant and production year affect hydraulic pump flanges, seal groove geometry and pin sizes even within one model line. See our guide on identifying the correct JCB 3DX seal kit by year.

6. Sourcing the part from RRE International

Search the reference in any format in the catalogue at rreinternational.com/products, or send it to our parts desk with your machine serial number:

• Single part: use the enquiry button on the product page, or WhatsApp the number.
• Multiple parts: submit a Bill of Materials (RFQ) with references, quantities, machine models and your destination port.

RRE International manufactures and exports aftermarket replacement parts as an independent, ISO 9001:2015 certified supplier; it is not an authorised JCB dealer. Part numbers are used for identification and cross-reference only.

Have Questions About Parts Identification?

Send your machinery serial number or photos of damaged parts to our technical engineering team for instant identification and quotation.

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