Description

Landtrac 330 HST, 390 HST Parts Catalog – OEM Factory Parts Breakdown

You’ve got a 330 HST or 390 HST sitting in the bay, and you need a gasket kit, a seal, or a hydraulic line. You grab the part number from an aftermarket listing, order it, and it’s wrong. The bolt holes don’t line up, the O-ring is the wrong durometer, and now you’ve lost half a day waiting for the correct part. I’ve seen it a hundred times. That’s why the Landtrac 330 HST, 390 HST Parts Catalog exists – it’s the exact same document the dealer uses to order parts. 244 pages of factory part numbers, exploded diagrams, and the real OEM reference numbers. No guesswork, no third-party interpretation. If you work on these tractors, you need this on your workbench.

Factory Parts Data vs Aftermarket Cross-References

Aftermarket parts catalogs are a gamble. They take a blurry photo of a part, guess a number, and call it a day. This catalog comes straight from LongAgribusiness, the manufacturer. Every part number in here is the one they stamped on the box. The gasket section alone (pages 1-1 through 1-5) shows the exact OEM Long numbers for the cylinder head gasket, intake manifold gasket, valve stem seals, and the full overhaul gasket kit. Look at the table: Item 1-34 is the gasket kit, Long No. 906386. That’s the number you give your parts supplier. No cross-referencing, no calling three different dealers. Automotive Industry Overview tells you the same thing – OEM documentation is the only reliable source for part numbers.

What’s Inside the 244 Pages?

The catalog is divided into two main sections: Section A and Section B. Section A covers the engine and drivetrain – gaskets, pistons, rings, bearings, seals, and the clutch assembly. Section B handles the hydraulic system, electrical components, steering, and the HST (Hydrostatic Transmission) parts. Each section has exploded diagrams with callouts, a table of part numbers, and quantities per model. You’ll find the overhaul gasket kit listed for both 330 HST and 390 HST, but note the quantities differ – the 390 HST uses a different oil pan gasket and extra O-rings. The catalog shows it side by side, so you order the right kit for your machine.

330 HST vs 390 HST – Part Differences You Need to Know

Many engine gaskets are shared between the two models, but the catalogs list them separately. For example, the water flange gasket (Item 5, Long No. LG4853) is the same on both. But the crankshaft oil seal (Item 27, Long No. LG4690) appears only on the 330 HST diagram; the 390 HST diagram shows a different seal arrangement. If you try to use a generic seal, you’ll get a leak. The catalog’s exploded view shows exactly which seal goes where, and the table gives you the OEM vendor number (04717-01200 for that seal). Don’t rely on aftermarket interchange lists – they miss these nuances.

How to Use This Catalog for Accurate Ordering

First, identify your model – 330 HST or 390 HST. Then find the section that covers the system you’re working on. Look at the exploded diagram, find the item number, and cross it to the table. Write down the Long No. and the vendor number. Call your parts supplier with both numbers. If you’re ordering the overhaul gasket kit, the catalog lists the complete kit number for each model. For the 330 HST, it’s 906386; for the 390 HST, it’s a different kit (check the diagram). The catalog also includes O-rings, sealing washers, and drain plug gaskets – things that often get overlooked. Do not skip the torque specs section (if needed, refer to the service manual; this parts catalog doesn’t list torques, but it tells you what part to buy when you inevitably strip a bolt).

Common Mistakes When Ordering Parts for These Tractors

The biggest mistake is assuming that because the 330 HST and 390 HST share the same engine block, all gaskets are identical. The catalogs show that the oil pan gasket part number differs: Item 13 on the 330 HST is LG4468, while the 390 HST uses LG4471 for the same location. The intake manifold gasket is the same (LG4475), but the exhaust manifold gasket differs due to the turbo option on the 390 HST. Another mistake is using aftermarket O-ring assortments. The hydraulic control plate O-rings (Items 32-34) have specific dimensions – 04811-00120, 04811-00150, etc. – that you won’t find in a generic kit. Automotive Industry Overview reinforces that OEM parts catalogs are the only way to guarantee fit and function.

Frequently Asked Questions

Does this catalog include part numbers for both the 330 HST and 390 HST?

Yes. Each section has separate diagrams and tables for each model. The gasket section shows the 330 HST on page 1-1 and the 390 HST on page 1-3, with unique part numbers where they differ.

Can I use this catalog to order parts for my tractor if I don’t have the serial number?

The catalog does not require a serial number – it covers all 330 HST and 390 HST models built by LongAgribusiness. However, if your tractor has been modified, the diagrams may not reflect aftermarket alterations. For stock machines, the parts are accurate.

Are there exploded diagrams for every system?

Yes. Section A and Section B contain exploded views for the engine, transmission, hydraulics, steering, electrical, and chassis. The diagrams are drawn by the factory, showing every bolt, seal, and gasket. The part numbers are called out in the adjacent tables.

Does this replace the service manual?

No. This is a parts catalog – it identifies the part numbers you need to order. It does not contain repair procedures, torque specs, or diagnostic steps. You need the service manual for that. But if you’re rebuilding an engine, having the parts catalog open alongside the service manual is the only way to ensure you order the correct gasket kit, seals, and bearings.

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I’ve been turning wrenches since before most of you were born, and I can tell you that the difference between a job that goes smooth and one that turns into a parts-chasing nightmare is often the catalog sitting on the bench. Access the Factory Manual now, and keep it in your shop. You’ll thank yourself the next time you need a cylinder head gasket for a 330 HST and you dial the right part number without a second thought.