Description

GEHL BU940 Parts Catalog – Factory Parts Manual for the Forage Box

You’re elbow-deep in a BU940 unloading mechanism, and the part you pulled from the bin has the wrong bolt pattern. I’ve been there. Third-party parts catalogs that copy from a copy of a copy – they get the thread pitch wrong, leave out the washer, or call a Grade 2 bolt where you need Grade 5. This GEHL BU940 Parts Catalog is the real factory document. 40 pages, direct from Gehl. No one redrew the pictures. No one guessed the torque specs. Every part number, every attaching hardware callout comes straight from the engineer who designed the forage box. If you want to order the right part the first time, this is the map.

Decal Location and Hardware Tables (Pages 4-5)

Decals get scraped off. You need to know where the warning decal goes after you repaint the feeder hopper side. Page 4 shows the exact decal locations – right feeder hopper side, left side, front. That’s where the serial number plate lives too. And page 3 gives you the hardware table: #12 hex nut, 3/8 lock washer, 1/2 hex jam nut, all with the Gehl part numbers. Common hardware like cap screws are Grade 5, cadmium or zinc plated unless noted. If the manual says “3/8HLN 650805,” you order that. Not a 3/8-16 from the bulk bin. That level of detail saves you a trip back to the dealer.

What’s Inside the Unloading Mechanism Section?

Pages 6 through 9 break down the entire unloading mechanism. Cross conveyor, discharge spout, drive chain, sprockets – each component is drawn with a callout number that ties to the parts list. If the cross conveyor chain is slapping, you need to identify the right roller. The exploded view shows the chain path and the idler sprocket location. That’s information you don’t get from a generic parts list. The manual also tells you “Right” and “Left” are determined from the rear looking forward. That orientation keeps you from ordering a left-hand part for the right side.

Unloading Conveyor: Finding the Right Roller and Chain

Pages 10-11 cover the unloading conveyor. The apron chain, slats, return rollers – they’re all there with individual part numbers. You need a replacement return roller? The drawing shows the bearing and shaft assembly. The parts list gives you the roller part number, the shaft, and the attaching hardware (lock washers, hex nuts). No aftermarket catalog gives you that kind of breakdown. If you’ve ever tried to match a worn-out roller by measuring diameter and guessing, you know the frustration. This manual eliminates that.

Check the Attaching Hardware Table Before Ordering

On page 3, the Attaching Hardware Table lists every common fastener size and its Gehl part number. 1/4-inch hex nut? Part 653005. 5/16-inch lock washer? 650424. 3/4-inch hex jam nut? 653053. The manual also warns you: common hardware is listed but NOT illustrated. And when you order a replacement part, the hardware for mounting is not included – you order it separately. That’s a detail that saves you from a half-finished job because you’re missing a lock washer. Grade 5 bolts need Grade B nuts. The table tells you which is which.

40 Pages of OEM Part Numbers – From Box Ties to Optional Roof

This Parts Catalog covers the whole BU940 forage box. Box ties and front unloading components (pages 12-15), beaters, drive and roof support (16-17), beater and apron drives (18-19), transmissions and safety clutch (20-21). The universal drive on page 22, optional third beater on page 23, optional roof on page 24. Even the accessory conveyor extension (pages 34-35) and truck mounting kit (page 36). Every section has the same format: exploded view plus parts list with part number, description, and quantity. No ambiguous callouts. No “see dealer for details.”

Numerical Index: Cross-Reference Without the Headache

Pages 37-38 are a numerical index of every part number in the manual. Need to find where a specific sprocket appears? Look up the number, get the page. That’s a feature you don’t see in aftermarket copies. Combined with the table of contents on page 3, you can locate any part in under a minute. That’s time saved when you’re billing by the job or trying to get the forage box back in the field.

Why OEM Documentation Beats Aftermarket Every Time

I’ve had customers bring me parts from third-party catalogs where the drawing showed a 12-tooth sprocket but the part was a 14-tooth – because someone traced a blurry photocopy. This GEHL BU940 Parts Catalog is the original factory print. The drawings are crisp. The part numbers match what Gehl stamped on the box. The hardware table comes from Gehl’s engineering specs. If you’re working on a BU940, you don’t want a reprint of a reprint. You want the source. For related machines, check the GEHL SL4640, SL4840, SL5640, SL6640 2005 Parts Catalog or the GEHL SL7610, SL7710, SL7810 2005 Parts Catalog – OEM Factory Specs. There’s also the GEHL RS6-34 2013 Parts Catalog – Factory OEM Manual for compact loaders. For a deep dive on the engines used in these machines, this Wikipedia article on diesel engines covers the basic theory, but the manual is where you get the actual part numbers. And if you want to go further, this Wikipedia article on diesel engines is a read, but it won’t tell you what bolt holds the flywheel housing together.

Frequently Asked Questions

Does this manual include torque specs for the BU940?

No. This is a parts catalog, not a service manual. It gives part numbers, exploded views, and hardware callouts. Torque values are in the service manual.

How do I identify which version of the BU940 this manual covers?

The manual covers the BU940 Forage Box as built by Gehl with form number 902433. The serial number plate is located on the right feeder hopper side. Decal location page 4 shows exactly where. If your serial number falls in the range for this manual (not specified in the document), the parts should match. For any doubt, cross-reference the numerical index on page 37 with the part you’re holding. The factory part number is stamped on most major components. If the number appears in the index, you’re looking at the right page. If not, you may need a later revision – but given this is an OEM manual, it’s the most accurate snapshot Gehl published for that production run. I’ve used these manuals for years; they’re reliable as long as you verify the serial number range with your dealer if the unit has been modified or rebuilt.

Don’t waste time with aftermarket parts lists that leave out the attaching hardware table or swap the bolt grade. This is the factory document. Access the Factory Manual and keep it on your tablet or print it for the shop. When you’re pulling the unloading conveyor off a BU940, you’ll be glad you have the exploded view and the correct part numbers at your fingertips. 40 pages, direct from Gehl. That’s what this site delivers.