Description

O&K 1500 Parts Catalog – OEM Factory Specs

I’ve been under enough loader hoods to know that guessing part numbers gets you a box of wrong gaskets and a lost afternoon. If you’re working an O&K 1500 Parts Catalog—the real one, printed by Trojan Industries Inc., not a third-party rehash—you’re holding the exact reference that parts counter guys used back in ’82. This is the TB089 manual, part number 2022991, revision 8, 214 pages thick. It doesn’t tell you how to rebuild the machine; it tells you what number the factory stamped on every brake line, every wiring harness clip, every bucket tooth. That’s what you need when the phone rings and the customer says, “The front axle cradle bolt sheared off.”

214 Pages of Factory Part Number Data

The index at the front is your road map. You want a brake assembly? Flip to pages 100-101A. Need the accelerator pedal linkage for a GM engine version? That’s page 36-36A. The manual covers both the GM and Perkins-optioned 1500 loaders—separate sections for air cleaner, alternator mounting, cooling system. Every entry gives you a part number, name, and quantity. Some items are flagged “A/R” (as required) or “N.S.S.” (not serviced separately). Pay attention to those footnotes; they’ll save you ordering a seal that only comes inside the master cylinder. The brake group axle pages (100-101A) alone have saved me three misordered wheel cylinder kits this year.

Does This Manual Cover the Fuel System and Wiring?

It does. Page 46-48 covers the battery and main wiring, plus the alternator and back-up warning alarm. The wiring diagrams aren’t troubleshooting schematics—they’re locator drawings showing where each harness clip and terminal lives. Need the part number for the starter solenoid feed wire? It’s in that spread. The brake control lines (page 88-89E) and brake valve (page 90-91) are also charted with full hardware callouts. You won’t find wiring color codes or circuit current ratings; this is a parts catalog, not a service manual. But if you’re trying to order the correct pigtail for a 1500’s backup alarm, this is the document that gets you the right one.

Audience Fit: Who Needs This on the Bench?

Two groups: the DIY farm loader owner and the shop parts manager. If you’ve got a 1500 loader that’s missing its bucket indicator or the automatic hoist cut-out sensor is dead, you need the exact part numbers from page 118. For a professional shop, this manual eliminates the phone-and-hope routine. Your junior tech can look up the cushion valve (page 74P-75) and have the order written before the customer finishes coffee. Don’t use this to adjust your valve clearances—grab the O&K 1500 Technical Manual for that. The parts catalog complements the service data; each one does a different job.

Source Validity: Why OEM Beats Aftermarket

I’ve seen third-party parts books that claim “equivalent” part numbers. They usually miss the engineering revision letter or skip the serial number break. This manual was printed by Trojan Industries Inc., March 1982, with revision 8 incorporated. It includes the serial number blank page (page 2) where you record your machine’s engine and transmission serials. That’s critical—some axles changed at serial break 1500‑XXXXX. Aftermarket catalogs rarely note those. The OEM layout shows exploded isometric views with callout bubbles; the part number in the table matches the engineering print. For the O&K 1500 1975 Parts Catalog – OEM Factory Parts Manual, the same logic applies—older machines need the right decade’s book.

Using the Index: A Real-World Example

Say you need the steering cylinder seal kit. Go to page 76-76C. The exploded view shows the cylinder rod, gland nut, and piston. The parts list gives you each component’s number. But note the “N.I.” notation—parts not illustrated are still listed, like the internal O-ring that’s only serviced as part of the cylinder assembly. If you skip reading the footnotes (page 3 explains abbreviations like A/R, N.S.S., N.I.), you’ll order a part that doesn’t exist separately. I’ve watched a tech waste an hour because he ignored the “N.S.S.” flag beside a valve spool. Read the intro page. It’s two minutes of your life that saves you two hours of return freight.

7 Systems for the 1500 Loader

• Powertrain: transmission controls (page 82-83), torque converter note, clutch cut-out switch (92-92A)
• Hydraulics: main control valve assembly (64-69), accessory piping (52-55), cushion valve (74P-75)
• Brakes: brake control lines (88-89E), brake valve (90-91), brake group axle (100-101A)
• Electrical: battery & wiring (46-48), alternator mounting (30-33A), backup alarm (46-48)
• Structure: axle cradle (10-12), counterweight (10-12), cab/canopy (10-12), enclosure (104-106)
• Attachments: bucket assembly (26-27), bucket teeth (198), cutting edge (26-27), automatic bucket leveler (116-117)
• Steering: cylinder (76-76C), and the hydraulic controls (58-69)

Remember: the 1500 model used both GM and Perkins (PO) engines. The catalog separates accelerator pedal linkage, air cleaner, alternator mounting, and cooling system by engine type. If you order the GM alternator bracket for a Perkins machine, it won’t line up. Check the engine model on your serial tag. You can cross-reference with the O&K 1500 1982 Parts Catalog – Factory Specs & Part Numbers—same revision 8, but the 1982 edition may have superseded certain part numbers. Always go by your machine’s serial number, not just model year.

Can I use this parts catalog to rebuild the transmission?

No. This catalog only lists part numbers and exploded views. For overhaul procedures, grab the service manual. The parts catalog tells you what to order; the service manual tells you how to install it.

Does it include torque specs for the brake assembly?

It includes hardware part numbers like bolts and washers, but no torque values. You’ll find torque specs in the respective workshop manual. What this book gives you is the correct bolt part number, so you don’t mix a Grade 5 with a Grade 8.

How do I read the “N.S.S.” and “A/R” notations?

N.S.S. means the part is not serviced separately—buy the parent assembly. A/R means as required; quantity varies by machine configuration. Both notations are explained on page 3 of the catalog. If you ignore them, you’ll find yourself holding a spool that only comes inside a valve body you don’t want to replace.

My 1500 has a Perkins engine—which pages cover the cooling system?

Pages 34H-35B are for the Perkins (PO) engine cooling. The GM engine cooling is on pages 34-34F. The catalog separates them clearly. Look for the engine designation in the page header.

If you’re still tracking down a phantom problem—like a brake valve that won’t hold pressure after a rebuild—the parts catalog won’t tell you the cause. But it will tell you which seal kit to order from the brake valve page (90-91). That’s the value of this book: it keeps you from ordering the wrong part. The Automotive Industry Overview of parts cataloging hasn’t changed much—OEM documentation is still the fastest way to get the right nut and bolt. For the wiring harness clips and brake line fittings, this book is gold. Automotive Industry Overview can tell you about manufacturing history, but it won’t give you the part number for the 1500’s automatic hoist cut-out switch. Access the Factory Manual and keep it next to your computer. When you need a bucket tooth for the 1500, you’ll have it in under a minute.