Description

O&K L45, 4500Z 1990 Parts Catalog – TB126

If you’re rebuilding an O&K L45 or 4500Z loader, you need the right parts. I’ve seen guys order a hydraulic filter three times because they didn’t write down the machine serial number. This 302-page parts catalog from 1990 is the only way to get the correct part number the first time. O&K Trojan Inc. put this together with group numbers so you can find what you need without flipping through the whole book. Skip the serial number step and you’ll be waiting on the wrong part for two weeks. That’s wasted time and money.

Group Numbering: The System That Works

This manual uses group numbers to break the machine down. First two digits tell you the system. For example, Group 32 is the hydraulic system. Next two digits narrow it to the assembly – 32 05 is the hydraulic tank. Last two digits zero in on the component – 32 05 01 is the hydraulic filter. That’s from the introduction on page 3. Learn that pattern and you can locate any part in under a minute. No guesswork, no flipping through every page.

Index in front lists every group and the page where the illustration lives. Use it.

Why You Must Record the Serial Number

O&K changed parts constantly. The same model built two months apart can have a different steering cylinder. Page 4 of this catalog tells you where to find the serial number – on the side of the servo console and stamped on the left rear frame below the safety link. Write it down on the data sheet on page 2 before you order anything. I keep a grease pencil in my toolbox and mark the machine before I even open the book. Without that number, you’re ordering blind.

When you call a dealer, they’ll ask for: model number, serial number, part number, part name, quantity, and shipping address. That’s all on page 4. Have it ready or they’ll hang up.

Ordering Parts: What This Catalog Delivers

This is a parts catalog – it shows exploded-view illustrations and lists each item with a part number and description. No torque specs, no service procedures. If you need to rebuild a final drive, get the service manual. But if you need the correct seal kit or hydraulic hose, this is your reference. Every illustration is keyed to a group number. For example, the hydraulic filter group I mentioned earlier references the illustration on pages 23–25 (not in this manual, but the pattern holds).

Related manuals: O&K L45 4500Z Parts Manual – Section: Group 01 covers the engine group. O&K L3000 Parts Manual TB 143 and O&K L2500 Parts Manual TB141 are also available if you have other models.

Page 2 – Don’t Skip the Data Sheet

Page 2 has blank lines for machine serial number, engine model, transmission and axle part numbers. Fill them in with a pen that won’t fade. I use a Sharpie. That single page saves hours of backtracking when you’re ordering for a customer’s machine. If you inherit a loader with no paperwork, that data sheet is gold.

For background on loader design, you can read Automotive Industry Overview. It’s not loader-specific but helps understand the evolution of off-road equipment. Also check Automotive Industry Overview for general context.

Does This Manual Cover Both L45 and 4500Z?

Yes. Title page calls it “L45/4500Z Parts Manual TB126.” The illustrations apply to both models unless noted. Always cross-reference with your machine’s serial number because O&K made running changes. A 1990 L45 might use a different hydraulic pump than a 1992 4500Z.

Does this manual include torque specs?

No. This is a parts catalog – part numbers and illustrations only. Torque specs are in the service repair manual.

How do I find the part I need?

Start with the index. Determine the basic system (engine, hydraulic, drivetrain) and find the group number. Turn to the illustration referenced, locate the item number on the image, and read the part number from the list. Always confirm with your machine serial number because O&K changed parts without notice. The manual has a data sheet on page 2 – fill it out before you order. If you skip the serial number, expect to order the wrong part at least once.

This is the factory printed manual from 1990, not a reprint or aftermarket copy. 302 pages, spiral-bound in the original PDF. Access the Factory Manual and get the right part numbers for your O&K L45 or 4500Z loader.