O&K 5500 Parts Catalog – Factory OEM, Not a Guess

I’m Mike Callahan. Twenty-eight years turning wrenches in San Antonio, and I’ve seen more aftermarket parts catalogs that couldn’t hit the broad side of a barn. If you’re ordering parts for an O&K 5500 loader, don’t waste your time on reprints that miss part numbers or swap illustrations. You need the factory Parts Catalog—manual TB114, part number 4601821, covering serial numbers 59-1511 and higher. This is a genuine Trojan Industries publication. 209 pages of exploded views and part numbers that match what’s actually on the machine. No guesswork, no calling back to correct an order because the gasket thickness was wrong. That costs you hours and money.

The index groups parts by system. You need brake components? Turn to the Brake Group section. Wiring harness fried? There’s a Battery & Wiring page that shows every connector and terminal. Hydraulic valve leaking? The Main Control Valve Assembly illustration is clear enough that even a rookie can spot the spool and seal. This catalog is the difference between getting the job done and chasing ghosts on Monday morning.

Brake Group: Stop the Loader, Not the Search

The Brake Group section covers the whole stopping system—air chamber, brake valve, lines, and the axle brake groups front and rear. Page references are baked into the index. For example, the Brake Valve assembly is detailed in the group. If you need the exact seal kit for a Trojan brake valve, you’ll find the part number listed next to the item callout. No aftermarket cross-reference that might be a few thousandths off. Use the factory drawing, order the right part, and get the loader back in the pit. Safety comes first—brakes aren’t somewhere to guess.

Valve Assemblies: Main Control and Transmission

Two critical valve groups are laid out: the Main Hydraulic Control Valve and the Transmission Control Valve. Each assembly has its own set of pages with item numbers and descriptions. The Main Control Valve assembly includes the valve body, spools, springs, and plugs. The Transmission Control Valve shows the shift spools and modulator. If you’re rebuilding either, the parts catalog gives you the O-ring sizes and the correct spring length. Don’t trust a generic parts book. Get the genuine O&K Automotive Industry Overview on proper part sourcing—this catalog is that standard applied to construction equipment.

Wiring and Battery: Trace It Without a Multimeter Headache

The Battery & Wiring section covers the electrical distribution—battery cables, alternator (75 amp), starter circuit, and the watertight connectors. When a machine loses charge, you need to know which wire goes where. This catalog isn’t a wiring diagram, but it shows every electrical component with its part number. The Alternator & Mounting page lists the bracket bolts and the voltage regulator. The Accessory Hydraulic Piping section even shows the wiring clips that hold the harness to the frame. If you can identify the part, you can order it. That beats tracing a rubbed wire for three hours.

Axle Assemblies: Front and Rear – No Guesswork on Bearings

Axle Assembly (Front) and Axle Assembly (Rear) sections are separate. Each one breaks down the spindle, housing, planetary gears, and brake group. The Axle Cradle and Cab Carrier Assembly (Planetary) pages show the mounting hardware. Need a pinion seal? Find the item number, look up the part number, and order. The Torque Converter and transmission sections are also listed. With 209 pages, you can drill down to the bucket cylinders, lift cylinders, steering cylinders, and the automatic bucket leveler. Every bolt and bushing is documented.

Why This Factory Parts Catalog Beats the Aftermarket Copies

Aftermarket publishers often reprint from scanned originals with faded part numbers or skip pages. This is a direct scan of the original Trojan manual. The group-numbering system (e.g., Group 32 05 01 for Hydraulic Filter) is intact. The notes like N.S.S. (Not Serviced Separately) and N.I. (Not Illustrated) are present so you know when you have to buy the whole assembly. No third-party interpretation. The Automotive Industry Overview emphasizes using authentic documentation—this catalog is the real deal. Compare that to a photocopy that loses the last digit of a part number. I’ve had that happen. It costs a week.

3 Common Questions About the O&K 5500 Parts Catalog

Will this catalog work for my machine if the serial number is below 59-1511?

This manual covers Serial No. 59-1511 & Higher. If your machine is older, some parts may have changed. You can still use the illustrations as a reference, but for exact part numbers you need the manual for your serial range.

Does it include torque specs or assembly instructions?

No. This is a parts catalog, not a service manual. It identifies parts. For torque values and rebuild steps, get the factory service manual for the O&K 5500.

Can I find brake line fittings and the brake valve in the same section?

Yes. The Brake Controls & Lines pages cover lines, fittings, and the brake valve assembly. The Brake Valve itself is listed separately under its group number.

Are wiring harness part numbers listed?

The Battery & Wiring section shows the harnesses, connectors, and terminals. You’ll need to identify the specific branch from the illustration. The catalog lists the main harness part number and the watertight connector part numbers.

Related Manuals for the Job

• O&K 5500 Parts Catalog
• O&K L45, 4500Z 1990 Parts Catalog – Parts Manual TB126
• O&K L3000 Parts Catalog – Factory OEM Manual (236 Pages)

If you want to stop wasting time on wrong parts and get the loader back in operation, download the Factory Manual. Click the link above or on the product page to get the full 209-page PDF. Print the page you need, order the part, and move on.