BISO 6170, 7070, 7071 Parts Catalog

If you are ordering parts for a BISO straw chopper and you are tired of getting the wrong knife, belt, or bearing, stop guessing. Those part numbers you scribbled from an online forum? They cost you two days in downtime waiting for the return. I have seen it happen to guys who thought they could eyeball it. The BISO 6170, 7070, 7071 Parts Catalog is the factory document that gives you the exact exploded view and part number for every component on those three models. No translation errors, no third-party redraws. 94 pages of OEM data from the same source the assembly line used.

Knives, Belts, and Drums: Section Breakdown

This parts catalog is organized by assembly. You get dedicated sections for KNIVES (4U.36.1), V-BELT (4U.36.2), the BISO-STRAW CHOPPER BASIS FRAME (4U.36.51), and the FLAIL DRUM WITH BEARING (4U.36.52). Each sub-section lists every nut, bolt, and specialty part with its factory part number. Need the distributor box? There is a separate page for the BISO-STRAW CHOPPER DISTRIBUTOR BOX (4U.36.53) and one for the electric regulation variant (4U.36.55). The index at the front lets you land on the correct page in seconds.

Does This Catalog Cover the 7071 Model?

Yes. Sections marked with “+ 7071” are specific to that model. For example, the BISO-STRAW CHOPPER LAYSHAFT SUPPORT + 7071 (4U.36.62) and the VEE BELT CLUTCH + 7071 (4U.36.67). If you own a 7070, you will find separate entries for the lay shaft and clutch (4U.36.61, 4U.36.63) and the electromagnetic clutch in both “W” and “S” versions (4U.36.65, 4U.36.66). The 6170 gets its own mounting frame section (4U.36.56) and guard hood cross-struts (4U.36.59). You will not have to cross-reference multiple manuals.

3 Reasons OEM Documentation Beats Aftermarket

First, the part numbers are verified by Automotive Industry Overview standards and the original manufacturer. Aftermarket catalogs often use generic numbers that do not match your dealer’s system. Second, the exploded views show the exact orientation of components like the flail drum bearing and the chaff spreader. Third, this document includes model-specific variations you will not find in a one-size-fits-all PDF. You get the factory index and the same data a dealer parts counter would pull up.

Use the Correct Part Number Every Time

Each assembly has a unique code in the margin (e.g., 4U.36.70 for the BISO conversion kit vee belt clutch). When you open that section, you see a numbered diagram with a corresponding list. Find the number on the diagram, then read the part number and description. No flipping back and forth to a separate table. This is how factory parts catalogs are meant to work.

Mounting Frame and Lay Shaft: 6170 vs 7070

The 6170 has its own mounting frame (4U.36.56) and hood cross-struts (4U.36.59). The 7070 uses a different lay shaft support (4U.36.61) and clutch assembly (4U.36.63). The catalog separates them clearly. If you need a lay shaft for a 7071, go to section 4U.36.64. If you need the electric distributor box regulation, it is section 4U.36.55. The whole document runs 94 pages, so you are not wading through irrelevant material.

This is the same document used by BISO dealers to order parts. The index lists every sub-section by code and page number. Bookmark it on your tablet or print the pages you need for the job. BISO Straw Chopper 6170 7070 Parts Catalog and BISO Straw Chopper Parts Catalog are related documents that cover additional model years and configurations. If you work on older Massey equipment, Massey-Harris-Ferguson FF 30 GS 1957 Parts Catalog | OEM Fastener Guide might also sit on your shelf.

One more thing about aftermarket copies: they often omit the KPAB-STRAW CHOPPER sections. This catalog includes them, from the basis frame (4U.36.77) through the chaff spreader (4U.36.116). You also get the SRX type variants (4U.36.92 – 4U.36.98). If you are piecing together a machine that was updated mid-production, that data saves you a return shipment. Automotive Industry Overview also notes that OEM documentation reduces warranty disputes. Trust the factory print.

Is this parts catalog the same as a service manual?

No. This is a parts catalog for ordering replacement parts, not repair procedures.

How do I find the part number for my specific model?

Use the index at the front of the 94-page document. Each model (6170, 7070, 7071) has its own sections marked in the title. For example, the 6170 mounting frame is under 4U.36.56, while the 7070 lay shaft support is under 4U.36.61. If the part you need crosses models, the catalog lists it once with a note. The exploded diagram will show the exact part number. Match the callout number to the parts list on the same page. No guesswork required.

Stop wasting money on parts that do not fit. Download the Factory Manual and get the correct part number the first time.