Description

Allis-Chalmers 645 Parts Catalog – Factory OEM Specifications

If you’re wrenching on an old Allis-Chalmers 645 wheel loader and you’re tired of ordering parts that don’t fit, or you’re swapping a brake assembly without knowing the exact cylinder seal kit number, you need this. A parts catalog isn’t a service manual – it won’t tell you how to rebuild the transmission. But it will tell you exactly which part number goes where, and that’s what keeps a machine running instead of sitting in the yard waiting for the wrong box to arrive. This is the factory OEM document, not a third-party reprint. 310 pages of exploded diagrams, indexed by system, so you can find the part you need before you call the dealer.

310 Pages of Factory Part Numbers

Thickness matters when you’re looking for a specific component. This catalog runs 310 pages front to back, with an alphabetical index that gets you straight to the section. Need a dump cylinder seal? Turn to page 213. Looking for a brake assembly part number for the front axle? Page 140. The index covers everything from Air Brake System (page 157) to Bucket Level Indicator (page 216). You’re not guessing part numbers – you’re looking at the same exploded view the dealer’s parts counter uses.

Brake Assemblies and Cylinder Breakdowns

Brake work on a loader this size isn’t a driveway job you want to redo because you ordered the wrong wheel cylinder. The catalog covers Brake Assy. for both front and rear axles (pages 140 and 142), with separate listings for the Wheel Cylinder (page 144) and Master Cylinder (page 154). Each cylinder section includes the complete assembly breakdown – pistons, seals, springs. You order exactly what’s on the diagram. No more returning parts because the rebuild kit didn’t include the right o-ring.

What Torque Specifications Are Included?

This is a parts catalog, so don’t expect torque sequences or fluid capacities. If you need those, you want the factory service manual for the 645 wheel loader – the one Allis-Chalmers published under form numbers like 3047531-3 for the maintenance manual. The parts catalog gives you the exploded view and part numbers; you still need to know how tight to turn the bolts. Pair it with the correct service manual and you have the complete package for a proper rebuild.

Order the Correct Cylinder Rebuild Kit

Hydraulic cylinders on loaders take a beating. The catalog lists Cylinder – Dump (page 213), Cylinder – Lift (page 215), and Cylinder – Power Steering (page 181). Every part in that cylinder assembly is called out with its own number. If you’re rebuilding the lift cylinders on your 645, you bring the page to your parts supplier and point to the seal kit number. That’s the difference between a two-hour job and a two-week wait for a misordered part. The same logic applies to the multi-purpose bucket cylinder parts on page 258.

Alphabetical Index: Why It Matters

Aftermarket parts catalogs often arrange things in a way that makes sense to someone who never turned a wrench. Factory OEM catalogs use an alphabetical index because that’s what works when you’re in a hurry. Looking for the Alcohol Injector? Page 161. Generator? Page 40. Governor? Page 276. You flip to the index, find the system, then go to the page. No flipping through random sections hoping the part number appears. That index is why this Allis-Chalmers HD-6EP Parts Catalog – Factory OEM 374 Pages follows the same structure – because it’s proven in the field.

Another thing you won’t get from a generic PDF: the ordering instructions. Page 3 of this catalog tells you exactly how to order parts from an Allis-Chalmers dealer, including what serial numbers to give and how to confirm orders. That might sound basic, but when you’re 200 miles from the nearest dealer and need a part shipped right, you save a headache by having the correct form numbers ready. The manual also lists available related service literature – for axles (form 3053547-0), brakes (form 3047530-5), bucket and chassis (form 3055458-8), and electrical system (form 3051888-0). All of that is cross-referenced in the back.

If your machine has a serial number of 2032 or higher, this catalog gets you only part of the way. The title page says it covers the 645 wheel loader prior to S/N 2032. Machines after that cutoff will need a different revision. Always check your serial number before you order – don’t trust the internet rumor that “they’re all the same.” That’s a mistake that costs real money.

This is an original factory PDF, scanned from the printed document, not a retyped or reformatted version. The page numbers match the paper original. If the diagram says “Item 10 – Cylinder Block Assembly” on page 166 of the Compressor section, you see the exact same layout a dealer would see. No guessing which washer goes where. No wondering if the part you ordered is superseded or obsolete. The catalog includes supersession hints in the part number lists, so you know if a part has been replaced by a newer revision. For a machine that’s been out of production for decades, that information is the difference between a part that’s available and one that’s dead-end.

Also keep in mind that certain components like the Turbocharger have multiple form numbers depending on the build (0649088-2, 0668380-9, etc.). The catalog lists all applicable variations so you can match your specific unit. Same for the Transmission, Torque Converter, and Charging Pump group – it covers all three serial number ranges (3044122-4, 3052630-5, 3052631-3). You don’t get that level of detail from a generic parts list.

If you’re maintaining a fleet of older Allis-Chalmers loaders, this manual belongs on the shelf right next to the service tools literature (form 0650850-1) and the other related manuals we stock. Check out Allis-chalmers HD21A 1965 Parts Catalog – Factory OEM for the HD21A, or Allis-chalmers HD16D, HD16DC 1970 Parts Catalog – OEM Factory Specs for the HD16 series. Every one of them follows the same factory indexing system – you learn one, you can navigate all of them.

The Automotive Industry Overview covers general manufacturing standards, but for specific loader parts you need the original engineering. And when you’re ordering parts for machinery that old, understanding the difference between OEM and aftermarket sourcing matters – Automotive Industry Overview might give background, but the actual part numbers come from the factory catalog.

Does this parts catalog include repair procedures or torque specs?

No. This is a parts catalog only – exploded views and part numbers. For service procedures, order the corresponding service manual for the 645 wheel loader.

Can I use this catalog for a 645 with serial number above 2032?

This catalog covers 645 wheel loaders prior to serial number 2032. Machines built after that cutoff may have different part numbers, especially for brake cylinders and hydraulic components. Always verify your machine’s serial number before ordering parts from this catalog. You can check the machine’s serial plate near the operator’s seat or on the frame rail. If your serial number is 2032 or higher, look for a later revision of the parts catalog – form numbers changed over production years.

When you’re ready to stop guessing part numbers and start ordering what actually fits, get the factory document. Access the Factory Manual from AutoRepairManuals – it’s the same PDF the dealer would print from, no reprints, no guesswork.