Bobcat Serial Numbers on Older Machines: Where to Look

Older Bobcat loaders do not carry the 17 character machine identification number used on current equipment, which means the year is not encoded in a single character and modern decoder tables do not work on them. On machines like the 743, 753 and 863, the plate is usually on the rear left of the machine above the grille, with several fallback locations.

Key Points

• Primary location: rear left of the machine, above the rear grille
• No 17 character PIN: these predate that standard entirely
• Year is not encoded in a single character on these machines
• What decides parts: serial breaks, not model years
• Second number to find: the engine serial, on the block
• If the plate is gone: numbers are often stamped into the frame

Where Is the Serial Number Plate on an Older Bobcat?

On the numbered series machines, the identification plate is typically fixed to the rear left side of the machine, just above the rear grille. That is the first place to look on a 743, 753, 763, 773, 843 or 863.

The plate is exposed to weather, pressure washing and loading damage in that position, so it is frequently the part of the machine in worst condition. Before deciding it is missing, clean the area and look for rivet holes that indicate where it used to be.

What the plate carries:

• The model designation, including any variant letter
• The machine serial number
• Weight and capacity information on some builds

Where Else Is the Serial Number on a Bobcat Loader?

When the rear plate is gone, painted over or unreadable, there are three fallback locations worth checking before giving up.

• Inside the cab, down by your right foot, near the parking brake lever or the steering linkage
• The right frame side, on the outer vertical frame near the operator seat or the footplate area
• Stamped into the frame itself. On the older machines the number is sometimes struck directly into the main frame or the chaincase near the rear axle

The stamped frame number is the one people miss. It survives when a riveted plate does not, but it is usually buried under decades of paint, grease and dirt. A wire brush and a degreaser over the suspected area will often bring it up.

Take a photograph once you find it. On a machine of this age the number will only get harder to read, and having it on your phone saves repeating the exercise every time you order a part.

Why Does My Bobcat Serial Number Not Look Like a 17-Digit PIN?

Because these machines were built before that standard existed. Current equipment across most manufacturers carries a 17 character product identification number built to an ISO standard, in which the tenth character encodes the model year.

Older Bobcat loaders use a shorter, manufacturer specific serial format instead. It contains no ISO year field, no standardised plant code, and no check digit.

The practical consequences matter more than the history:

• Year decoder tables built for modern machines do not apply. Applying one to an older Bobcat produces a confidently wrong answer
• Online decoders that assume a 17 character input will either reject the number or return nonsense
• The number still identifies the machine precisely. It just does it differently

What Do the Numbers on an Older Bobcat Serial Mean?

Older Bobcat serial numbers are generally structured in two parts: a leading group that identifies the model and build configuration, and a trailing group that is the production sequence for that configuration.

The leading group is the half that matters for parts. Two machines wearing the same model badge can carry different leading groups if they were built to different configurations, and that difference is what a parts catalog needs in order to return the right component.

What the number does not contain is a year field. There is no character to decode into a manufacturing date, which is why the next section exists as a separate question rather than a table.

Record the number in full, exactly as it appears, including any leading zeros. Partial serials are a common cause of wrong parts, because the missing digits are frequently the ones that distinguish configurations.

How Do I Find the Year of an Older Bobcat?

This is the question that brings most people here, and the honest answer is that the year is not in the serial number on these machines. There is no character to decode.

Three routes actually work:

• The plate itself. Some builds print a year or a build date directly. If it is there, that is your answer and no decoding is required
• A Bobcat serial range chart. Manufacturing periods are matched to serial ranges rather than derived from the number. A dealer can look yours up, and range charts circulate among owners
• Documentation. Original paperwork, registration or service records frequently carry a date that no amount of decoding will produce

Be wary of any online tool offering to decode a year from an older Bobcat serial. If the underlying number contains no year field, a decoder cannot extract one, and the confident answer it returns is generated rather than read.

For what it is worth, the year usually matters less than owners expect. Parts on these machines change at serial breaks, not on January 1st, so the serial is the more useful number even when the year is known.

What Is the Difference Between the Model Number and the Serial Number?

The model number identifies what kind of machine it is. The serial number identifies which specific machine, built in which configuration and at what point in the production run.

	Model number	Serial number
Example form	753, 863, 843B	Longer numeric string on the plate
Identifies	The machine family	This individual machine
Shared by	Thousands of machines	One machine
Use it for	Narrowing a search	Confirming a part actually fits

Searching on the model alone is where most wrong orders begin. It returns every part ever fitted to that family, including components from serial ranges that do not apply to your machine. The model narrows. The serial confirms.

Where Is the Engine Serial Number and Why Does It Matter?

The engine carries its own serial number, stamped directly on the block, and it is entirely separate from the machine serial.

This matters more on older machines than on new ones for a simple reason: engines get replaced. A loader that has been working for thirty years may well be on its second engine, and if so the machine plate tells you nothing useful about what is actually fitted.

Beyond that, Bobcat used engines from several manufacturers across the numbered series. Kubota, Isuzu and Deutz units all appear depending on model and build. Filters, gaskets and injection components are ordered against the engine, not the loader, so identifying the engine correctly is the difference between the right filter and a returned part.

Record both numbers together and keep them together. Every parts conversation about an older Bobcat goes faster when both are to hand.

How Do I Order Parts for an Older Bobcat Using the Serial?

Work in this order, and the hit rate improves considerably.

1. Read the OEM part number off the component being replaced, if it is legible. This is the strongest identifier available
2. Record the full machine serial from the plate or the frame stamping
3. Record the engine serial separately, for anything engine related
4. Note the variant letter where the machine has one, such as a B or H suffix
5. Check serial range notes on any listing before ordering

Wear items are where most orders land, and most of them are still well supported. Bushings such as a Weld-On Bushing replacing Bobcat 6702958 and a Wear Bushing replacing Bobcat 6730997, along with cab hardware like the Window Wiper Blade replacing Bobcat 7188372, were shared across machines of this era.

Customers are responsible for verifying fitment before ordering. If your plate is unreadable and you are working from a frame stamping you are unsure about, send what you can read to sales@partsonline.com and our team will work with you rather than leaving you to guess.

What If the Serial Plate Is Missing or Unreadable?

This is common on machines of this age and it is not the end of the road.

Look for the frame stamping first. Clean the main frame and the chaincase area near the rear axle with a wire brush. Struck numbers survive long after a riveted plate has gone.

Check for rivet holes. Four holes in a rectangle on the rear panel tell you where the plate was and confirm you are looking in the right place.

Try oblique light. A worn stamping that is invisible under direct light frequently becomes readable with a torch held almost flat against the surface.

Take a rubbing. Paper over the area and a soft pencil rubbed across it will pick up characters your eye cannot resolve.

Fall back on the engine serial. Even with no machine number at all, the engine identifies the powerplant, which resolves filters and engine parts. For machine side components, careful measurement and OEM numbers read off the old parts will get you there.

If a machine has no readable identification anywhere and its history is unknown, that is worth pausing on for reasons beyond parts. Verify ownership documentation before buying or investing in a repair.

Frequently Asked Questions

Where is the Bobcat serial number located?

On older numbered series machines it is usually on the rear left of the machine above the grille. Fallback locations include inside the cab near your right foot by the parking brake lever, the right frame side near the seat, and stamped into the main frame or chaincase near the rear axle.

What year is my Bobcat 743?

The year is not encoded in the serial number on machines of this era. Check whether the plate prints a date directly, and otherwise match the serial against a Bobcat serial range chart through a dealer. No decoder can extract a year that the number does not contain.

Can I decode a Bobcat serial number for free online?

Tools exist, but for older machines treat their year output with caution. These serials contain no year field, so any tool returning a confident year for a pre-PIN Bobcat is generating rather than reading it.

Why does my Bobcat serial not have 17 digits?

Because the machine predates the ISO product identification number standard. Older Bobcat loaders use a shorter, manufacturer specific format with no ISO year or plant field.

What is the difference between a Bobcat model number and serial number?

The model identifies the family of machine, such as a 753 or 863. The serial identifies your specific machine and its build configuration, and it is the number that confirms whether a part actually fits.

Where is the engine serial number on a Bobcat?

Stamped directly on the engine block, separate from the machine plate. It is the number used for filters, gaskets and engine components, and it matters particularly on older machines where the engine may have been replaced.

Do parts change by year or by serial number on older Bobcats?

By serial number. Manufacturers apply running changes at serial breaks rather than at model year boundaries, which is why the serial is more useful than the year even when both are known.

What if my Bobcat has no serial number at all?

Clean the frame and chaincase area and look for a stamping, and check the rear panel for rivet holes marking where the plate was. The engine serial will still resolve engine parts. If no identification exists anywhere and the machine history is unknown, verify ownership documentation before investing in it.