Description

GEHL 1640 Parts Catalog – Factory Specifications for Your Forage Box

If you are tearing down a GEHL 1640 forage box to replace bearings, chains, or sheet metal, you need the right part numbers the first time. Guessing gets you a phone call from the parts counter saying the bolt you ordered is wrong. I have seen guys spend an hour cross-referencing a part number from a photocopy that was copied three times. That stops here. The GEHL 1640 Parts Catalog puts the factory exploded views, part descriptions, and torque values in your hands. Sixteen pages of clean OEM data – not a reprint from a third party. You will use this manual to identify exactly what fastener goes where, and how tight it needs to be.

This catalog covers the 1640 forage box only. It does not cover the tractor or the PTO driveline – that is a separate manual. But for the box itself, you get the Introduction with ordering instructions, Decal Locations on pages 2-3, Rear Unload Assembly on pages 4-5, Box Components on pages 6-7, Lights on page 8, and the Tie Down Kit on page 9. The Alphabetical and Numerical indexes on pages 10-11 help you find parts fast. And the inside back cover holds the Standard Hardware Torque Specifications – the same torque values GEHL used on the assembly line. Those are the numbers you want. Not a generic chart from a hardware store.

Decal Locations – Page 2-3

Decals on this machine are not decorations. They tell you the model and serial number, warning labels, and operating instructions. The manual shows the exact location of each decal on the left side of the box frame near the chain reduction drives. If you need to order a replacement decal, the part number is right there. I keep a copy of this page in my service truck because customers peel decals off and then forget the model number. Page 2-3 stops that problem cold.

Rear Unload Assembly – Where the Heavy Stuff Lives

The rear unload system takes the most abuse on a forage box. The chain and slat assembly, the drive gear, and the shear bolts all live back there. The exploded view on pages 4-5 shows every bearing, sprocket, and bolt. Each part has a reference number, and some reference numbers have a hexagon with a torque value in foot-pounds. For example, if the manual shows a number 45 inside a hexagon next to a cap screw, that screw gets 45 ft-lb – no guessing, no “snug plus a quarter turn.” That is the GEHL spec. Follow it.

Standard Hardware Torque Specifications – Inside Back Cover

This is the page I dog-ear immediately. The inside back cover lists torque values for Grade 5 cap screws, hex nuts, and lock washers. Every bolt on the 1640 that is not called out individually in an exploded view defaults to these torque values. You want to know how tight a 5/16-18 Grade 5 cap screw should be? That information is on the inside back cover. Do not rely on a generic internet torque chart that lumps all grades together. Use the factory spec that matches the hardware on your machine.

One more thing: the manual uses a hexagon symbol around a number to denote torque. See it in the exploded view? That means the torque is mandatory. Skip it and you will either under-tighten and lose the part or over-tighten and strip the threads either way you waste time.

Box Components and Lights – Sheet Metal and Electrical

Pages 6-7 cover the box structure: side sheets, floor, and the unloading gate hardware. The parts catalog lists every nut, bolt, and washer. If you need to replace a worn floor chain, the part number is here. Do not try to measure the chain pitch and hope – the factory number is in the book. Page 8 covers the lights: tail lights, side markers, and the harness clips. The manual does not include a wiring diagram (that is in the operator’s manual), but it does give you the part numbers for the lenses and bulbs.

Why OEM Documentation Beats Aftermarket Copies

I have seen aftermarket parts catalogs that show a bolt when the factory used a stud. The illustration is “close enough” but close enough costs you a trip back to the dealer. This GEHL 1640 Parts Catalog is the same document that the GEHL dealer used when the machine was new. The exploded views are drawn to match the actual production parts. No reverse-engineering, no guesswork. If you want to understand why this matters, read this Wikipedia article on diesel engines – the same principle applies to agricultural equipment: original engineering data is the only reliable source.

You might also need manuals for other Gehl models. Check the GEHL SL4640, SL4840, SL5640, SL6640 2005 Parts Catalog for the skid loaders, or the GEHL SL7610, SL7710, SL7810 2005 Parts Catalog – OEM Factory Specs if you work on the larger machines. The GEHL RS6-34 2013 Parts Catalog – Factory OEM Manual covers the roller screeds. All OEM, all factory specs.

Frequently Asked Questions

Does this manual include repair procedures for the GEHL 1640?

No. This is strictly a parts catalog – exploded views, part numbers, and torque specs. Repair instructions are in the service manual. But you need both to do a proper job.

What torque values are listed in the manual?

Standard hardware torque specs are on the inside back cover. Some specific fasteners in the exploded views also show a torque value in foot-pounds inside a hexagon symbol. Those take precedence over the standard chart.

How do I find the correct part number for a worn chain?

Flip to the Rear Unload Assembly section on pages 4-5. The exploded view shows the chain and slat assembly with a reference number. Match that number to the parts list and order that part number. The manual also gives you the quantity required.

Is this a reprint or a genuine OEM document?

This is the original OEM PDF as released by GEHL Agriculture. Form number 909860, revision B. No aftermarket edits, no scanned pages from a used manual. You get the factory file. That is why we put the “OEM” label on it – and that is why the torque values are correct.

If you are tired of guessing part numbers and chasing bolts that do not fit, get the GEHL 1640 Parts Catalog on your tablet or laptop today. Click the button to access the factory manual now. You will have the exploded views, part numbers, and torque specs ready before you pull the first bolt. It is the difference between doing the job once and doing it twice.