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Your Caterpillar Serial Number (SN) is an 8 character alphanumeric code, typically starting with 3 letters and ending with 5 numbers. In early 2000 Caterpillar changed to a 17 character Product Identification Number (PIN) that conforms to the construction equipment industry standard. The PIN contains the serial number for the machine.
In the photo below, the PIN is CAT00D5GPWGB01070, and the Serial Number is WGB01070 the last 8 characters of the PIN. If you are searching for a service manual for your machine, WGB01070 should be used in the ServiceManualPro.com searchbox. In the photo below, the serial number MHK03801 is for the engine only, and would not return the correct results for the complete service manual for this D5G bulldozer.
If you are having trouble identifying your PIN or serial number, feel free to take a digital picture of your PIN plate and email it to us. We will quickly identify what serial number (and manuals) you will need for your machine.
Engine Serial Number Plate
Typically located on the right rear side of the cylinder block.
Wheel Loader PIN Plate
Typically located on the left side of the front frame, near the operator station.
Skid Steer Loader / Multi Terrain Loader PIN Plate
Typically located on the rear of the machine.
Backhoe Loader PIN Plate
Typically located on the left side of the front frame, near the cab.

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