Description

BISO 6170, 7070, 7071 Parts Catalog – OEM Factory Parts Breakdown

If you’ve ordered a part for a BISO straw chopper and got the wrong one because some aftermarket website had a bad drawing, you know exactly why this catalog exists. This is the factory parts catalog for the BISO 6170, 7070, 7071 Parts Catalog. 94 pages of exploded views and OEM part numbers. No re-drawn diagrams, no guesswork. Every section is labeled with the factory reference codes like 4U.36.1 for knives. You match the part number to your machine, you order it once. I’ve torn down enough equipment to know that the time you waste chasing wrong parts is time you don’t get back.

What’s Inside the 94 Pages

Open this catalog and you’ll find the complete parts breakdown for the straw chopper attachment on the 6170, 7070, and 7071 models. Sections include knives (4U.36.1), V-belt (4U.36.2), BISO-straw chopper basis frame (4U.36.51), flail drum with bearing (4U.36.52), distributor box (4U.36.53), distributor box regulation electric (4U.36.55), mounting frames specific to each model, deflector sheets (4U.36.58), guards and hood cross-struts, layshaft supports and clutches, electric magnetic clutches for the 7070 in both “W” and “S” versions, vee belt clutch for the 7071, a straw warning system (4U.36.68), electrical equipment (4U.36.69), conversion kits for vee belt clutches, chaff spreaders, and the entire KPAB-straw chopper line with serial number breaks. If you need the layshaft support for a 7070, you go to section 4U.36.61. It’s all indexed.

Why OEM Drawings Matter for Parts Identification

Aftermarket parts catalogs often use generic silhouettes that don’t show the actual fastener orientation or bracket shape. This catalog uses the factory engineering drawings. You can see exactly how the distributor box mounts, where the tension roller goes on the KPAB mounting frame (section 4U.36.83), and which guide rollers (4U.36.84) fit which serial number range. That detail matters when you’re standing in the field with a broken flail drum and you need the right bearing part number. You won’t find that level of accuracy in a reprint.

Clutch Systems and Safety: El.Magnet and Vee Belt

The 7070 model uses two versions of an electromagnetic clutch — “W” and “S” — covered in sections 4U.36.65 and 4U.36.66. The 7071 uses a vee belt clutch (4U.36.67). If you’re swapping a clutch, you need the exact factory part number because the wiring and engagement hardware differ between versions. The catalog also includes conversion kits (4U.36.70 – 4U.36.72) if you’re updating an older machine. Safety note: any work on the clutch or layshaft requires locking out the PTO and verifying zero residual energy. The manual doesn’t spell that out in a warning block, but you know better. If you don’t, get a service manual too.

KPAB-Straw Chopper Variants and Serial Number Breaks

This catalog splits the KPAB-straw chopper sections by serial number breaks: -Y 05147 and +Y 05148 (for basis frame and distributor box), and further breaks for mounting frame tension roller, guide rollers, deflector sheets, layshaft, and layshaft support. Section 4U.36.83 covers the mounting frame tension roller for machines +Y 005542 to -Y 06439. Section 4U.36.84 covers guide rollers for +Y 06440. If you skip the serial number check, you’ll order the wrong support bracket. That’s a trip back to the parts counter. Use the break numbers in the catalog.

Who Needs This Catalog

If you own a combine or tractor with a BISO straw chopper — model 6170, 7070, or 7071 — this catalog belongs on your bench. It’s also for independent repair shops that take in farm equipment, and for home garage enthusiasts who maintain their own machinery. The indexed format (94 pages) lets you jump straight to the section you need. For example, section 4U.36.75 shows the chaff spreader for the 6170 / W. No flipping through unrelated parts. The BISO Straw Chopper Parts Catalog is the base reference; this catalog covers all three models together. For a narrower focus, see the BISO Straw Chopper 6170 7070 Parts Catalog variant. If your shop works on older Massey-Harris gear, the Massey-Harris-Ferguson FF 30 GS 1957 Parts Catalog | OEM Fastener Guide is a different animal but same principle: factory drawings save your ass.

OEM vs. Aftermarket: Why Trust the Factory Print

I’ve seen aftermarket catalogs that flip left and right, mirror the drawing, or leave out a bolt. This is a direct scan of the original BISO factory catalog. The reference codes like 4U.36.53 for distributor box match the actual part tags on the machine. If you’re trying to compare this to a generic diagram, you’ll notice the difference immediately. The factory print shows the exact orientation of the flail drum bearings and the mounting holes for the deflection sheets. Don’t trust third-party summaries. For context on how the automotive industry handles documentation standards, see Automotive Industry Overview. Same principle applies to agricultural equipment: OEM data is the only data that counts.

Frequently Asked Questions

Does this parts catalog include torque specifications?

No. This is a parts catalog, not a service or repair manual. It contains exploded views and part numbers only. You’ll need a separate factory service manual for torque values, fluid capacities, and assembly procedures.

Which models are covered exactly?

The catalog covers BISO straw choppers for models 6170, 7070, and 7071. Each model has its own mounting frame and clutch variants; those are listed separately in the sections.

Are wiring diagrams included for the electrical equipment section?

Section 4U.36.69 covers the electrical equipment components (sensors, magnets, wiring harnesses) but does not provide full schematic wiring diagrams. It shows the parts and their part numbers. For wiring routing, you’ll need the factory electrical manual.

How do I figure out which part number to order for my machine?

First locate the serial number of your straw chopper attachment. Then find the corresponding section in the catalog – for example, KPAB-straw chopper sections are split by serial number breaks (-Y 05147, +Y 05148, etc.). Match the exploded view to your assembly and note the part number from the callout. Double-check the model number (6170, 7070, or 7071) because mounting frames and clutches differ. If in doubt, contact your BISO dealer with the serial number and the part number from the catalog.

Access the Factory Manual and you’ll have the exact reference your parts guy wishes you’d bring in. No more cross-referencing, no more returns. 94 pages, OEM data, one PDF.