Description

Caterpillar 120H 1998 Parts Catalog

Anyone who has spent time chasing the wrong part number on a 120H motor grader knows the waste. Two weeks waiting, wrong seal, wrong bearing, back order. Aftermarket parts catalogs are guessing without the serial number breakdowns. This is the original Caterpillar 120H 1998 Parts Catalog – Volume II, pages 481 through 902, printed March 1998. It covers the machine, engine, and transmission by exact serial number range. No third-party reprints. No copy of a copy.

Machine Serial Number Breakdown: Why It Matters

That serial number range at the top – 5FM1-Up for the standard version, 98Z15500-Up for the engine, 4MY440-Up and two others for the transmission – is not decoration. It is the exact filter used to pull the correct part. A 120H built before 4MY440 uses a different hydraulic pump bracket than one after. This catalog lists each variation by serial number. You match your machine’s data plate to the chapter and find the right group number in seconds.

3116 Engine and Transmission Parts Coverage

Powered by a 3116 engine, the 120H has four different transmission ranges listed. The catalog separates them: 4MY440-Up, 5AY527-99999, 7LX750-99999. Each transmission group has its own parts breakdown. Order a clutch plate for the wrong range and it will not fit. The factory spec for each part is printed with the group number. Torque converter parts, planetary gears, seals – all listed by serial break.

490 Pages of Factory Spec Data

Four hundred ninety pages. This is Volume II of the set, but it is a complete parts catalog in itself. Starts at page 481 and goes through 902. That means every part number for the 120H is in here – engine internal parts, transmission, final drives, frame, hydraulic system, electrical components. Caterpillar 120H 416D D6R 938G 2004 Training Manual – OEM Specs is a different document. This one is pure parts. If you are rebuilding a transmission, you need the exact group number from this catalog to order the overhaul kit. No guessing.

You get the full factory part number, the quantity per assembly, and the illustration callouts. The machine identification information on page 5 shows where to find your serial number plate. That information is printed in English, French, and Spanish – the same page used by dealers worldwide.

Who Needs This Catalog

Home garage mechanics who bought a used 120H at auction. Small shop owners who do not have access to Caterpillar’s online system. Anyone tired of ordering from aftermarket catalogs that list parts with vague “fits up to serial” notes. This is the same document a dealer parts counter uses. Caterpillar 120H 1998 Parts Catalog – OEM Factory Manual – the exact file. If you are rebuilding a 3116 engine, you need the piston and ring group numbers from this catalog. Do not trust a third-party cross-reference.

OEM vs Aftermarket: The Difference on the Bench

Aftermarket parts catalogs often omit the serial number breaks. They list a part as “fits 120H” without telling you that the hydraulic pump changed halfway through production. Then you receive a part that does not bolt up. The OEM catalog forces you to check your serial number first. You cannot skip that step. Caterpillar designed the 120H with these variations, and the parts catalog reflects that. Automotive Industry Overview explains why equipment variations exist, but this catalog gives you the actual part numbers to keep your machine running.

The document is a scanned OEM original, not a rekeyed copy. Every page is legible. You can zoom in on the callout numbers and read them. Caterpillar C15 2006 Parts Catalog – Factory OEM 884 Pages is a similar resource for heavy-duty trucks.

Frequently Asked Questions

Will this catalog work for a 120H with an engine serial below 98Z15500?

No. That number is the start of the range covered. Earlier engines are a different catalog.

How do I know which transmission serial range I have?

Check the transmission data plate. Then match it to one of the three ranges listed: 4MY440-Up, 5AY527-99999, or 7LX750-99999. If your serial falls between 4MY440 and 5AY526, you use the first range. The catalog groups the parts accordingly. If your serial is 5AY527, you move to the second range. Do not mix them – the internal clutch packs changed.

Stop fighting with wrong parts. The factory parts catalog for the Caterpillar 120H is available here as a direct access. Access the Factory Manual and get the correct part numbers the first time. No waiting for returns. No second orders.