Description

GEHL BU 80, BU 81, BU 82, BU 83, BU 84 Parts Catalog

If you’re ordering a beater paddle or a conveyor chain for a GEHL BU 80, BU 81, BU 82, BU 83, BU 84 Parts Catalog model, you don’t get to guess. I’ve seen guys order a BU82 unloader sprocket for a BU83 and then wonder why the machine eats belt drives. This is a factory GEHL service parts catalog – the same one your dealer uses. It’s 48 pages of exploded diagrams and part numbers that actually match the hardware on your self-unloading forage box. No aftermarket consolidation, no “fits various models” garbage.

Section Breakdown by Model – BU80 Through BU84

Each model gets its own dedicated pages. The BU80 starts on page 3 with the Forage Box assembly, then the Feeder (page 4), Hopper (page 5), Conveyor (page 6), and Unloader (page 7). The BU81 adds a Beater section on page 11, Conveyor Extension (page 13), and Truck Drive (page 14). BU82 introduces a Third Beater on page 18. For the BU83, the Unloader diagrams run pages 22-23. The BU84 Beater section is spread across pages 26-27, and the Rear Door and Shaft Mounting is on page 41. If you’re working on a BU84 and need the Third Beater specs, that’s on page 28. Every part is drawn with its orientation and hardware callouts – you match the number, you order the right piece.

Why a Parts Catalog Beats Eyeballing a Worn Part

I’ve seen guys pull a rusted beater blade off a BU83, walk to the dealer, and say “give me one of these.” Then they get home and it’s an inch short. That’s how you turn a two-hour repair into a two-week wait. This catalog gives you the exact GEHL part number, the quantity per assembly, and the bolt pattern. It also shows attachments like the conveyor extension transmission for the BU84 on page 31. Don’t trust your memory – trust the exploded view. Your safety depends on beater clearance and conveyor chain tension. Wrong part, bad clearance, and you’re stuffing a broken chain into the hopper.

48 Pages – No Guesswork in Part Selection

The Numerical Index on page 43 lets you cross-reference any part number you find in the diagrams. If you’ve got an old part with a legible number, you can confirm it against the index and see which models it belongs to. There’s also a section on Universal Drives on page 42 and the BU82-BU83-BU84 Clutch assembly on page 38. For related equipment, check out the GEHL SL4640, SL4840, SL5640, SL6640 2005 Parts Catalog and the GEHL SL7610, SL7710, SL7810 2005 Parts Catalog – OEM Factory Specs. If you’re running a skid loader with a forage box attachment, the GEHL RS6-34 2013 Parts Catalog – Factory OEM Manual might also be relevant. But for this specific self-unloading box series, this catalog is the only source that covers everything from the BU80’s basic feeder to the BU84’s third beater and conveyor extension transmission.

OEM vs Aftermarket Parts Identification

Aftermarket parts catalogs love to lump five model years into one drawing. This is the original GEHL document – notice the plate location info on page 2. For BU80, the serial number plate is on the left hopper side; for BU81 through BU84, it’s on the right hopper side. If you’re trying to figure out which model you actually have, that’s where you look. The catalog also lists “with attachments” – the BU80 and BU81 share some feeder parts, but the BU84 has a different hopper and a third beater that the older models don’t use. Factory documentation tells you exactly where the differences start. The same principle applies to engine-driven equipment – understanding power input is critical, so check out this Wikipedia article on diesel engines for background on the PTO driveline, and for a deeper dive into diesel engine fundamentals, this Wikipedia article on diesel engines explains the power source that runs your forage box.

Audience Fit – Who Should Have This Open on the Bench

If you own a BU80, BU81, BU82, BU83, or BU84 and you do your own maintenance – or you have a hired hand who thinks “close enough” is a valid fastener spec – get this catalog. It’s for the operator who doesn’t want to pay dealer markup on every cotter pin. It’s for the shop foreman who wants his techs to reference the actual exploded view instead of sketching on a grease-stained napkin. The pages are numbered, indexed, and organized by model. You can go from hopper to beater to unloader without flipping through five different sections. Beginners: do not order parts without verifying the model number using the plate location on page 2. A BU83 and BU84 share a conveyor extension, but the unloader transmission is different. One wrong number and you’re down for a week.

Does this catalog cover the BU85?

No – this catalog is specific to BU80, BU81, BU82, BU83, and BU84 only.

How do I know which beater part to order if the drawing shows two different blades on the same page?

Each diagram includes a callout table that lists the part number, description, and quantity per assembly. The BU84 Beater section on pages 26-27, for example, shows the beater housing, shaft, and blade assemblies separately. You match the figure number and callout letter to the table. If the blade is worn down and you can’t read the part number, measure the length and compare it to the dimensions given in the diagram note. This catalog also uses the terms “Right” and “Left” as defined on page 2 – stand at the rear of the forage box looking toward the tractor hook-up end. That orientation is critical for ordering the correct conveyor extension or truck drive components. I’ve seen guys flip that and install a left-hand beater on the right side – then they wonder why the crop doesn’t clear. Read the orientation note before you order. Save yourself the headache.

Don’t burn your weekend chasing wrong parts. Access the Factory Manual and get the real numbers – the exploded views, the hardware callouts, and the model-specific breakdown that keeps your forage box running.