GEHL 1260, 1265 Parts Catalog – OEM Exploded Views & Part Numbers

Description

I’ve been turning wrenches for 28 years, and I’ve seen too many guys order the wrong part because they didn’t have the right catalog. For GEHL 1260 and 1265 forage harvesters, the GEHL 1260, 1265 Parts Catalog is what you need on the bench, not some aftermarket reprint. This is the factory document – 90 pages of exploded views and part numbers straight from the OEM.

Factory documentation is the only way to get the correct part numbers. This Parts Catalog includes everything from decal locations to optional axles. You won’t find generic listings here – each component has a unique reference number. And the torque specs on the inside back cover save you from guessing on hardware.

Cylinder & Cutting Mechanism – Page 14

The cylinder section is where most wear happens. Page 14 shows the cylinder assembly, cutting mechanism, knife sharpener components (pages 18-21), and every bolt that holds it together. The tear drop symbols tell you where oil is applied – ignore those and you’ll starve a bearing. Use the reference numbers to order the exact seal, knife, or shaft. No measuring, no returns. When you pull the cylinder, you’ll find the bevel transmission behind it. The parts catalog lists the bevel gearbox components on pages 62-63. The feed roll drive frame (24-25) and roll arm assemblies (26) are all interconnected. If you replace the cylinder bearings, you need the correct flanged cap screws and lock nuts. The torque spec for those is on the inside back cover – typically 150 ft-lb for Grade 5 bolts, but check your specific application. The exploded view also shows the overrunning clutch on page 27, which is critical for proper shutdown. Don’t rely on online parts diagrams that don’t match your serial number – this manual specifies for 1260 after SN15500 and all 1265’s. That’s the kind of detail that separates a working repair from a stripped-out headache.

Don’t skip the tear drop symbols.

Torque Specs on the Inside Back Cover

Standard hardware torque values are printed on the inside back cover. That page lists foot-pound values for Grade 5 cap screws, flanged lock nuts, and hex nuts. Use those specs when tightening the cylinder bolts, feed roll arm fasteners, or any other threaded connection. The manual also gives the torque for steel and zinc-plated hardware. If you’re mixing metric fasteners, the abbreviation list on page 2 helps decode them.

Does This Manual Cover the Hydraulics?

Yes – pages 50-51 cover the hydraulic system, including the control box wiring and components. The metal stop amplifier box (56-57) is also detailed. If you need to replace a hose or cylinder, the parts list gives you the exact part number. No guessing based on length or thread size. The hydraulic diagram is a schematic of connections, not just a layout.

3 Key Sections for Common Repairs

Three sections you’ll use frequently: the Feed Roll Drive Frame (pages 24-25), the Overrunning Clutch (page 27), and the Bevel Transmission (pages 62-63). The feed roll drive frame includes all the chain and sprocket components. The overrunning clutch is a wear item that can cause driveline damage if it fails. The bevel transmission is the main power transfer to the cylinder and blower. Each section has a numbered parts list that cross-references to the numerical index (pages 78-86).

Why Factory Parts Catalog Beats Aftermarket

Aftermarket parts catalogs often skip the serial number breaks, orientation rules, and special fastener callouts. This manual tells you that right and left are determined from behind the unit facing forward. It notes that the bevel gearbox and main drive shaft are on the left side. It includes abbreviations like FCS for flanged cap screw and FLN for flanged lock nut. The tear drop and hexagon symbols for wet locations and torque values are printed right on the exploded view. That’s specificity you won’t get from a photocopy or a PDF scan.

Frequently Asked Questions

Does this Parts Catalog include torque values for all fasteners?

Yes, standard hardware torque specs are on the inside back cover. Always use those values for bolts, nuts, and flanged lock nuts.

How do I find the part number for a knife section?

Look up the Cylinder & Cutting Mechanism section starting on page 14. Each knife, bolt, and wear part has a reference number. Cross-reference the numerical index from pages 78-86 to get the part number. Make sure you have your serial number – there are differences between early 1260 and later models. For 1260 after SN15500 and all 1265’s, this manual applies. The serial number plate is on the right side of the main frame near the cylinder shaft bearing. That’s where you confirm it.

Can I use this for the GEHL 1265 only?

This catalog covers both 1260 and 1265. For 1260, note the serial number break at SN15500. All 1265’s are included.

Are the exploded views labeled with right and left?

Yes. The manual defines right and left from behind the unit facing forward. The bevel gearbox and main drive shaft are on the left.

If you want to avoid the headache of wrong parts and lost time, get the factory documentation. For the 1260/1265, Access the Factory Manual now and keep your harvest moving. Check out related manuals: GEHL SL4640, SL4840, SL5640, SL6640 2005 Parts Catalog, GEHL SL7610, SL7710, SL7810 2005 Parts Catalog – OEM Factory Specs, and GEHL RS6-34 2013 Parts Catalog – Factory OEM Manual. For engine fundamentals, refer to this Wikipedia article on diesel engines. Also see this Wikipedia article on diesel engines for additional details.