Description

GEHL 5635, 6635 1999 Parts Catalog

You need a part for a GEHL 5635 or 6635 skid loader. You open a generic aftermarket catalog and the illustration shows a different pump. The part number doesn’t cross. You waste half a morning on a return. I’ve seen it. That’s why you want this 1999 factory Parts Catalog – not a reprint, not a third-party compilation, but the actual PDF that GEHL sent to dealers. 146 pages of exploded views, reference numbers, and genuine part numbers. No guesswork.

Engine Section – Page 5 Coverage

Turn to page 5 in Section A: Engine. You get the exact breakdown for the powerplant – block, cylinder head, injection pump, gaskets, and seals. Each part is called out with its description, quantity, and GEHL part number. If a bolt requires a specific torque or thread locker, it’s noted behind the part number description (e.g., “(Loctite)”). The manual also includes a full abbreviation table inside the introduction so you know what “HEX” and “NILN” mean. No translating between shops.

Hydraulic Systems: Tandem Pump and Main Control Valve

Section B (Hydraulic Components) is where you’ll live if you’re chasing leaks or low pressure. The Tandem Pump (page 79), Main Control Valve (page 87), and Solenoid Valves for lift/tilt and brake (pages 91–93) all get separate exploded diagrams. Need the high-flow gear pump? Page 85. The self-level valve is on page 89. Every o-ring, spring, and spool is shown. You don’t order a whole valve body when a $6 seal would fix it. The GEHL SL5635 SL6635 1999 Engine Parts Book covers the other half of the machine if you need engine rebuild specs.

Why an OEM Parts Catalog Matters for the 5635 and 6635

Aftermarket parts catalogs miss updates. GEHL issued this revision H in March 1999 – it supersedes earlier prints. The introduction states: “GEHL Company reserves the right to make changes or improvements without incurring the obligation to install such changes on previously delivered units.” Translation: your machine might have a later serial number with different parts. This catalog lists model and serial number ranges for every assembly. You check your serial number decal (inside right chassis riser), find the correct illustration, and order the right part. That’s the difference between a one-hour fix and a three-day wait.

Who Needs This Manual – and Who Doesn’t

If you own a GEHL 5635 or 6635 and you’re ordering parts yourself, you need this. Home garage enthusiasts who rebuild skid loaders as side projects? Keep it on your tablet next to the workbench. Professional mechanics who touch older GEHL machines? You should already have this. If you only do oil changes and tire swaps, you can get by without it. But if you ever open a hydraulic circuit or tear into an Engine, you’ll want the exact part numbers in front of you. Combined with the GEHL SL5635 SL6635 1999 Parts Catalog (this manual), you have everything for ordering and assembly.

Source Authenticity: GEHL Factory Print vs. Aftermarket Reprints

This is a direct PDF scan of the original GEHL form number 907284. The OCR excerpt shows the factory abbreviations and the note about “genuine GEHL service parts.” Aftermarket reprints often crop illustrations, blur part numbers, or skip the full hydraulic component section. They also omit the standard attaching hardware torque table printed on the inside back cover. That torque table alone saves you from stripping bolts on the wheel drives or lift arm. For more background on diesel engines used in these loaders, read this Wikipedia article on diesel engines. But for part numbers, trust the factory file.

Can I use this to rebuild the engine?

No. This is a parts catalog, not a service manual.

Does this include torque specs for hydraulic fittings?

It includes standard attaching hardware torque values on the inside back cover (metric and SAE) but does not list specific hydraulic fitting torques. For those, you need the GEHL SL5635/SL6635 service manual. The parts catalog’s strength is identifying every seal, o-ring, and fitting so you can order the correct replacement. If you’re assembling a tandem pump, you’ll know which o-ring kit (part number from page 79) to buy, then you apply the standard JIC torque from the table. That combination gets you a leak-free build.

You’ve got the machine on the lift. The hydrostatic line is weeping. Look up the part number in Section B, order it, and get back to work. Access the Factory Manual now and keep it with your tools.

• GEHL 5635, 6635 Parts Catalog – Factory OEM Manual”>GEHL 5635, 6635 Parts Catalog – Factory OEM Manual