Description

Caterpillar 120H 1998 Parts Catalog

I’ve been turning wrenches since before some of you were born. I’ve watched too many jobs go sideways because a technician grabbed a part number from a third-party cross-reference. That’s why when I see a Caterpillar 120H 1998 Parts Catalog come across my bench, I stop what I’m doing. This is the original OEM document, 656 pages, published by Caterpillar in 1998 for the 120H Motor Grader powered by the 3116 engine. It’s the only thing I trust for ordering the right bearing, seal, or hydraulic line – the first time.

Caterpillar 120H 1998 Parts Catalog: What’s Inside

Flip to page 1 and you’ll find the product identification plate locations and the exact serial number breakdown: machine 5FM1-Up, engine 98Z15500-Up, and multiple transmission ranges (4MY440-Up, 5AY527-99999, 7LX750-99999). If you’re rebuilding a 120H and you don’t have these numbers, you’re gambling with your parts order. Stop guessing. The manual covers every component from the cylinder head to the oil pan, with exploded views and part callouts for the entire machine.

Why a Factory Parts Catalog Beats Aftermarket Listings

Over the years I’ve had to correct too many jobs where a technician assumed an aftermarket parts listing was correct because the illustration looked similar. The reality is that OEM manufacturers like Caterpillar make subtle revisions to part designs, and this 1998 catalog captures the exact version used at that time. If you try to substitute a part from a later model year, you might get a different seal diameter or a mounting bolt pattern that forces you to machine a bracket. That’s lost time and money. This manual eliminates that risk because every part number is tied to the specific serial number ranges listed on page 1. That level of specificity is what separates a factory manual from a third-party compilation. Trust me – I’ve been doing this long enough to know that the ten minutes you spend verifying a part number with the factory catalog saves you an entire afternoon of rework. Automotive Industry Overview

3 Critical Uses for This 656-Page Manual

Use it for:

• Finding the correct part number for a transmission overhaul (4MY440-Up, 5AY527-99999, 7LX750-99999).
• Identifying the correct hydraulic pump or valve assembly by serial number.
• Cross-referencing machine attachment serial numbers that often get lost in a rebuild.

I’ve personally used these pages to pull the right final drive parts for a grader that had been swapped with a different transmission. Without the factory catalog, I’d have been on the phone for an hour.

Verify Your Serial Numbers Before You Order

You’ll find the product information section on page 1. Match your machine’s PIN against the ranges – this catalog covers 5FM1-Up for the standard version. If your machine falls outside that range, this manual won’t help. That’s not a flaw; it’s proof that the manual is specific to your build. Don’t try to force a part from a different serial range – I’ve seen that end with a cracked housing and a very angry shop foreman.

Does This Manual Include Engine and Transmission Parts?

Short answer: yes. The engine is a 3116 (serial 98Z15500-Up) and the transmissions are covered under three serial ranges. The parts catalog breaks down every component – from the cylinder head to the oil pan, from the clutch pack to the output yoke. You’ll also find attachment part numbers on the product information page. Automotive Industry Overview

FAQ

Can I use this manual for repair procedures?

No. This is a parts catalog, not a service manual. It gives part numbers, not torque specs or removal steps.

What serial numbers are covered?

The manual covers machine 5FM1-Up, engine 98Z15500-Up, and transmissions 4MY440-Up, 5AY527-99999, and 7LX750-99999. You must verify your numbers on page 1.

Is this a reprint or a scanned copy?

The copy we sell is a digital scan of the original OEM dealer manual, not an aftermarket reprint. The page numbers, part callouts, and exploded views are exactly as Caterpillar printed them in March 1998. That means the illustrations are crisp and the part numbers haven’t been altered. Over 650 pages of verified data, no fuzzy images or missing callouts – exactly what you need to order the right part the first time.

How many pages does this manual have?

656 pages total, split into two volumes. Volume I runs to page 480.

Related Manuals

• Caterpillar 120H 1998 Parts Catalog
• Caterpillar D6R 938G 120H 416D Power Train Training Manual
• Caterpillar C15 2006 Parts Catalog – Factory OEM 884 Pages

If you’re working on a Caterpillar 120H and want to order the exact parts without a second trip to the parts counter, access the factory manual from AutoRepairManuals. It sits on my tablet in the shop, right next to my impact gun – and it keeps me from making expensive mistakes.