Case 450, 310G, 33 1973 Parts Catalog – Factory Specs

Description

If you are trying to find the right bucket pin for a 1973 Case 450 or a 310G crawler with a 33 backhoe, you have probably already discovered that aftermarket parts websites are useless. They show a diagram that looks close but the part number is wrong. Case 450, 310G, 33 1973 Parts Catalog is the factory Parts Catalog – Case Publication C995, dated 1973, 156 pages. It is the only document that gives you the original part numbers straight from the assembly line. No reprint copies, no generic drawings. This is a direct image of the Case-issued pages.

For context on the industry, refer to Automotive Industry Overview.

Serial Number Location – Get Your Machine’s Identity Right

The manual starts with serial number location diagrams. On page 4 you see the backhoe serial number location. If you skip this step you will order parts that do not fit. Every component group in the catalog is keyed to a serial number range. Write yours down before you open the book.

If you also work on newer 450s, the CASE 450 450CT 2006 Parts Catalog covers post-2000 models.

Dealers Owners Record – Why Those Blank Lines Matter

Page 5 shows a dealer owner record table. It looks like an afterthought but it is not. That table tells you the original attachments that came with the machine. If you are buying a used 450 or 310G, this record helps you verify if the 33 backhoe is original or a retrofit. That matters for cylinder pin sizes and mounting brackets. Trusting a seller without this document is gambling with parts fitment.

Parts Catalog No. C995 – What It Covers (and What It Doesn’t)

This is a parts catalog, not a service manual. It covers the 33 backhoe mounted on 310G and 450 crawlers. It includes exploded views of the swing frame, dipper stick, bucket, hydraulic cylinders, control valve, and mounting hardware. It does not include repair procedures or torque specs. You need a separate service manual for that. Some general documentation standards are discussed in Automotive Industry Overview.

Backhoe Hydraulic Cylinders – Finding the Right Seal Kits

The catalog breaks down each cylinder by part number. For example, the swing cylinder has a specific gland and piston seal set. Using a generic seal kit will cost you a day of labor when it blows out. This catalog lists the original seal part numbers. Cross them with current supplier availability. Note that some seals are superseded. The manual also shows the correct o-ring dash numbers. Do not rely on aftermarket parts websites for these – they often use the wrong cross-reference.

Using This 1973 Catalog on a Modern Job

Yes, the manual is printed in 1973. But many of these machines are still working. The part numbers have not changed for core components. For example, the bucket linkage pins on a 450 crawler use the same part number as the original. Do not throw away this catalog because the paper is yellow. Keep it in a waterproof binder. For daily operation, the CASE 450 1995 Operators Manual gives you controls and lubrication. The Case 26 Backhoe Operators Manual is a different model but the operation principles are similar.

FAQ

Does this catalog include torque specifications for mounting the backhoe?

No. This is a parts catalog, not a service manual. Torque specs are in the service manual.

I have a Case 450 serial number 123456. How do I know which section of the catalog applies?

Turn to page 4. The manual shows the backhoe serial number location. Then compare your serial number to the range listed in the parts group headings. Each major assembly (swing frame, boom, dipper, bucket) lists the serial number range it covers. If your machine falls outside the range, you may need the earlier or later supplement. This catalog is specific to the 33 backhoe for 310G and 450 crawlers built in the early 1970s.

Stop hoping a generic parts diagram will save you. Access the Factory Manual from AutoRepairManuals.