Case 35 Loader and Backhoe 1979 Parts Catalog – OEM Factory Specs for Backhoe Control Valves

Ordering parts for a Case 35 Loader and Backhoe without a factory parts catalog is like rebuilding a hydraulic valve blindfolded. You might get close, but you’ll install the wrong O-ring, snap a retainer, and bleed money. This Case 35 Loader and Backhoe 1979 Parts Catalog is the real deal – 102 pages of OEM part numbers, exploded views, and service kit listings printed in April 1979. Not a reprint, not a third-party scan. Genuine Case documentation.

I’ve spent decades behind a toolbox, and I can tell you the difference between a good job and a comeback job is having the right part number the first time. This catalog gives you exactly that for every section of the backhoe control valve – the dipper and bucket section, the swing section, the whole array of seals, spools, springs, and relief valve components. No guessing which O-ring goes where. The exploded diagrams on pages 1 through 5 lay out the entire valve assembly with reference numbers that tie directly to the parts list. You want to know if you need a G33073 spool or a G35444 valve section assembly? It’s all right there.

Backhoe Control Valve: Parts Breakdown

Dig into the dipper and bucket section first. The catalog lists two production runs for the valve section assembly – early production uses G33091, late production uses G35444. Miss that distinction and you’ll order parts that don’t fit. The spool (item 4, NSS – not sold separately) is only available as part of the assembly. You also get every O-ring size listed, including the backup ring (G35540) if used. Relief valve assembly G34043 comes with its own service kit G34862, which includes items 16 through 28 – poppet, spring, piston, retainers. That kit is a lifesaver when you’re rebuilding rather than replacing.

Swing Section Valve Assembly

The swing section (G33072) is covered separately starting on page 203 of the original manual. Same layout – exploded view with reference numbers, part descriptions, and quantities. Swing spool G33073, centering springs G34463 (two required), and load check poppets G33061. If you need the relief valve for the swing section, it’s the same G34043 assembly but the poppet is G33089, not the one in the dipper section. The catalog shows that difference clearly. Pay attention to the notes on late production changes – the set screw for the piston adjuster (1/4″-20 NC x 3/4″) and the special washer if used. Those details are why OEM documentation matters.

3 Valve Sections Covered in This Catalog

This parts catalog covers three distinct valve sections for the Case 35 backhoe: the dipper and bucket section, the swing section, and the main control valve body. Each section includes a reference diagram, a parts list with OEM part numbers, and service kit availability. The catalog does not cover the loader hydraulics – that’s a separate manual. But for the backhoe controls, you have everything you need to identify, order, and install the correct factory components.

Order the Correct Seals and O-Rings

O-rings get swapped out wrong all the time because aftermarket catalogs use generic cross-references. This catalog gives you the exact Case part numbers: A27365 for the spool O-ring (two required per section), 218-5008 for the large relief valve O-ring, G100959 for the small one. The backup rings are noted as “if used” – you have to check your actual valve because late and early production differ. The catalog tells you that. You don’t guess.

Relief Valve Assembly: G34043 Service Kit Contents

When the relief valve in your backhoe control valve starts leaking or won’t hold pressure, you’ve got two options: buy the complete assembly (G34043) or rebuild it using service kit G34862. The kit includes the poppet, spring, piston, retainers, and all the O-rings listed in items 16 through 28. Page 1 of the catalog shows the kit contents explicitly. I recommend ordering the kit and the assembly if you’re in a hurry – the kit covers common wear items, but the body (NSS) is only available as part of the assembly.

Why OEM Parts Catalogs Beat Aftermarket Charts

Aftermarket parts catalogs for old Case equipment are thin – they’ll list a generic O-ring size and tell you to match it up. That’s fine if you like returns and downtime. This 1979 factory catalog was printed when the machines were still in production. Every part number is verified against Case’s engineering drawings. The exploded diagrams are to scale. The supersession notes – like the early vs late valve section assemblies – are documented. You cannot get that from a reprint house. If you’re restoring a Case 35 backhoe or keeping it working, this is the only source you should trust.

What Audience Benefits Most

Home garage enthusiasts who own a Case 35 Loader and Backhoe and don’t want to pay a dealer to look up parts numbers will get immediate value. Same for professional mechanics who service these older machines and need a reliable reference for ordering. If you’re a collector restoring a vintage Case backhoe, this catalog is essential for tracking down correct hardware. The 102-page format means you get all the sections – not just the common ones. Flip to the page for the backhoe control valve and you’ll find the data you need. No fluff, no filler. Just part numbers and drawings.

Source Authenticity: Genuine Case 1979 Publication

This is not a digitized version of someone’s photocopy. It’s a direct scan of the original Case publication printed in April 1979 in the USA. The file is named CASE_35_Loader_And_Backho_1979_Parts_Catalog_en-18014013812.pdf – that’s the genuine article. Aftermarket sources often omit the “if used” notes or combine production runs incorrectly. This catalog preserves every detail. If you want to confirm, cross-reference the part numbers with any Case dealer parts system – they’ll match.

Related Manuals

• Case CX160B 2007 Parts Catalog – OEM Undercarriage Hydraulics
• Case CX27B 2007 Parts Catalog – OEM Factory Specs for Mini Excavator
• Case CX40B 2010 Parts Catalog – OEM Factory Spec Data

For broader knowledge of heavy equipment documentation, check the Automotive Industry Overview and the Automotive Industry Overview pages to understand how OEM standards are maintained.

Can I use this catalog to rebuild the backhoe control valve on my Case 35?

Yes, if you follow the parts list exactly. The exploded diagrams show every component, and the part numbers are OEM. Just order the correct service kit for your relief valve (G34862) and match the production run of your valve section.

Does this manual include torque specs for the valve assembly?

No. This is a parts catalog, not a service manual. It lists part numbers and quantities only. For torque specs, you need the factory service manual for the 35 Loader and Backhoe. Do not substitute aftermarket torque values.

Stop wasting time chasing wrong parts. Download the Factory Manual and get the exact part numbers Case engineers intended. Your backhoe will thank you.