Description

BISO 6170, 7070, 7071, SRX Parts Catalog – Factory OEM Agricultural Documentation

If you’re ordering parts for a BISO straw chopper without the factory parts catalog, you’re asking for a phone call from the customer about the wrong knife or a V-belt that doesn’t fit. I’ve seen it happen too many times. Don’t be that guy. This is the BISO 6170, 7070, 7071, SRX Parts Catalog – 91 pages of exploded diagrams, OEM part numbers, and reference identifiers that match exactly what BISO built. Skip this and you’ll be cross-referencing aftermarket lists that don’t match the holes in your mounting frame. That costs time and money.

What This Parts Catalog Actually Covers

Every assembly on the chopper is broken down into sub-sections with callouts. Page 1 kicks off with the 4090 tools and accessories index. Inside you get sections for 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.36.54), and the electric regulation box (4U.36.55). There’s a separate lay shaft support for the 7070 (4U.36.61) and another for the 7071 (4U.36.62). The clutch assemblies split the same way – EL.MAGNET clutch for the 7070 (4U.36.66) and VEE BELT clutch for the 7071 (4U.36.67). You also get the straw warning system, electrical equipment, and conversion kits for swapping clutch types. Chaff spreader sections are listed for the 6170 (4U.36.75) and other models. That level of specificity is what lets you order the right part the first time.

Does This Cover the SRX Model?

Yes, and it’s not crammed into a generic section. Separate KPAB-STRAW CHOPPER sections are dedicated to the SRX only: basis frame (4U.36.92), distributor box (4U.36.93), electric regulation (4U.36.94), mounting frame in two variants (4U.36.95 and 4U.36.96), deflector sheets (4U.36.97), and vee belt clutch (4U.36.98). If you’re working on an SRX, you need those pages specifically. Aftermarket catalogs often merge SRX parts into a single drawing and you end up with the wrong bracket.

5 Reasons You Need OEM Part Numbers

One, the knife section – there is no generic substitute for a BISO chopper knife. Two, the V-belt cross-section is specific to the pulley diameters on the 7070 versus the 7071. Three, the distributor box regulation electric uses a harness that changes between serial numbers. Four, conversion kits for the vee belt clutch are listed with the exact hardware kit numbers. Five, the chaff spreader mounting for the 6170 uses different bolts than the 7070. Every one of those differences is documented with a factory part number in this catalog. Aftermarket parts lists will guess. This catalog doesn’t.

Order the Right Knife – Every Time

The knife assembly (4U.36.1) is the most frequently replaced item on any straw chopper. This catalog gives you the OEM number for each knife, not a generic length description. You get the part number that matches the flail drum on your specific model. Cross-check that number against the V-belt section (4U.36.2) – if your drum is spinning at the wrong RPM because someone put the wrong pulley on, the catalog shows you the correct lay shaft/clutch combination for your model year.

BISO Straw Chopper: Factory Documentation vs. Aftermarket

I’ve had guys bring me aftermarket parts catalogs that claim to cover these machines. They always have at least one error – wrong bolt length, missing washer, mislabeled bearing. Factory documentation from BISO is the only source that guarantees the part you order will fit the machine on your lift. For context on why OEM documentation matters across the Automotive Industry Overview, the same principle applies to agricultural equipment: original engineering drawings and part numbers are the only reliable reference. This catalog is the real deal – scanned from the original BISO print.

Is this catalog the same for the 6170 and the 7070?

No. The catalog contains separate sections for each model. Chaff spreader for 6170 is on 4U.36.75, while lay shaft support for 7070 is 4U.36.61. Use the model index at the front.

Will this help me convert my 7070 vee belt clutch to a magnetic clutch?

The catalog includes conversion kits for the vee belt clutch on BISO-STRAW CHOPPER (4U.36.70-72) and for KPAB-STRAW CHOPPER (4U.36.99-101). These sections list every bolt, bracket, and electrical component needed for the swap. You’ll also need the EL.MAGNET CLUTCH “S”-VERSION section for the 7070 (4U.36.66). Without the factory part numbers, you’d be guessing at wire gauges and fastener grades. That’s dangerous at 540 rpm. Use the OEM numbers and sleep better.

If you want to keep your BISO chopper running without playing parts roulette, get the factory documentation on your bench. For other BISO models, check out BISO Straw Chopper Parts Catalog and BISO SRX Straw Chopper Parts Catalog. If you’re working on older equipment, the Massey-Harris-Ferguson FF 30 GS 1957 Parts Catalog | OEM Fastener Guide follows the same principle – OEM specs or you’re wasting time. Understanding the broader impact of aftermarket documentation flaws is easier with an Automotive Industry Overview.

Access the Factory Manual now and stop guessing.