Description

Case 780 CK 1980 Parts Catalog

If you’ve ever ordered a replacement Case 780 CK part from a generic parts website and ended up with a seal kit that doesn’t fit your boom cylinder, you know the waste of time and money. That’s why you need the factory document. This is the original 1980 Parts Catalog for the Case 780 Construction King Loader Backhoe, published by J I Case. It runs 662 pages and covers every part on the machine – from the engine block to the backup alarm. I’ve been wrenching for 28 years, and I can tell you: aftermarket catalogs get it wrong. This one doesn’t.

Backhoe Boom and Dipper Arm – Exploded Diagrams with Part Numbers

Go to the backhoe section and you’ll find the boom and dipper arm broken down into individual components. The boom cylinder guard, boom lock, buckets, extendable dipper – all listed with their factory part numbers. The dipper arm reinforcement kit page lists the weld-on gussets and hardware. If you’ve ever had a dipper arm crack, you know the value of that. The Cylinder section later gives you seal kits and replacement rods for each hydraulic unit. Page 509 starts the boom and dipper arm pages. You can see the exact orientation of pins, bushings, and hoses. That means you order the right part, not a “universal” that needs modification.

Hydraulic Cylinders: 11 Variants Listed

Under the Cylinders – hydraulic heading, you get separate listings for boom, bucket (backhoe and loader), clam, dipper, dipper extension, Hydra-Leveling, lift, stabilizer, steering, and swing cylinders. The swing cylinder section even includes the pivot pins and bushings. Each one has a dedicated parts breakdown with O-ring sizes, piston part numbers, and rod seals. If you’re rebuilding a cylinder, you need these numbers – not the ones from a generic seal chart. The catalog gives you the exact specifications from the factory.

Brake System – From Air Compressor to Wheel Cylinders

The brake system section is thorough. It covers the air compressor (Model 300 and Model 400), reservoir, governor, control valve, master cylinder, parking brake controls, tire inflation, treadle controls, and wheel cylinders with shoes and lining. Page 237 starts the air compressor details. If you’re chasing an air leak or replacing brake shoes, this catalog gives you the part numbers for every valve and line. No guessing.

Engine and Transmission Mounting – Factory Diagrams

Engine sections include the block, camshaft, connecting rods, pistons, rings, rocker arms, and the cylinder head. There’s a separate section for engine and transmission mounting. The flywheel housing and torque converter are covered separately, with all seals and bearings itemized. The transmission section covers clutches, torque converter, and the parking brake inside the transmission. All part numbers are original OEM, so you’re not dealing with aftermarket supersessions that might not fit.

Case 780 CK 1980 Parts Catalog – The Only Source You Need

This is the same catalog dealerships used. It includes the alphabetical index at the front and a numerical index at the back. That means you can look up a part either by its name or by a known number. It also includes serial number locations and product identification numbers – critical when ordering parts for your specific machine because Case made changes during production. The catalog is 662 pages of dense, accurate information. If you rely on aftermarket websites, you’re rolling the dice. With this catalog, you have the factory data.

For the operator’s manual, see Case 780 CK Loader Backhoe 1995 Operators Manual. If you need undercarriage hydraulics for a newer machine, check Case CX160B 2007 Parts Catalog – OEM Undercarriage Hydraulics. For mini excavator parts, Case CX27B 2007 Parts Catalog – OEM Factory Specs for Mini Excavator provides OEM specs.

To understand the broader context of construction equipment manufacturing, read the Automotive Industry Overview. The Automotive Industry Overview gives background on how machines like this are built.

FAQ – Common Questions About This Parts Catalog

Does this catalog cover the entire Case 780 CK machine?

Yes. Covers the entire machine from engine to backhoe.

Are there diagrams or just part numbers?

Both. Most sections have exploded-view illustrations showing how parts go together, with callout numbers that match the parts list.

Can I use this to rebuild a hydraulic cylinder?

Absolutely. The hydraulic cylinder pages give you the seal kit part number, piston, rod, and gland details.

What year machine does this cover?

Published June 1980, this catalog covers the 780 Construction King Loader Backhoe produced up to that date. Later machines may have updates; check the revision log on page 1. The revision log allows you to track changes. Also, the catalog includes serial number locations and product identification numbers, which are critical when ordering parts because Case made engineering changes. If your machine has a higher serial number than listed, you may need a later supplement. This catalog is a base document, but it is still the most accurate source for the original part numbers. Many aftermarket catalogs transpose numbers or use supersessions that don’t match the original design. Having the factory catalog lets you verify before you order. That’s the difference between a job that goes smooth and one that eats your billable hours.

Access the Factory Manual from AutoRepairManuals. Keep a digital copy on your shop tablet or print the pages you need for the job. When you’re ordering seals for a boom cylinder or tracing a part number for a control valve, having the original factory catalog means you get the right part the first time.