Description

BISO BISO-STRAW CHOPPER, KPAB-STRAW CHOPPER Parts Catalog – Factory Specs

If you’re ordering parts for a BISO BISO-STRAW CHOPPER, KPAB-STRAW CHOPPER Parts Catalog is what you need on the bench. Not a reprint. Not a generic cross-reference. The OEM document that came from the factory. Over the years I’ve seen guys pull a wrong knife set because they used an aftermarket diagram. That mistake costs a full day of field downtime and a second parts order. This catalog kills that guesswork cold.

What This 45-Page Parts Catalog Covers

Forty-five pages of OEM indexed parts. The table of contents starts on page 1 with the 4040 tools and accessories section, then breaks down every assembly on the chopper. Knives section (4U.36.1) gives you the factory blade part numbers for both the BISO-STRAW CHOPPER and the KPAB-STRAW CHOPPER. V-belt specs are on 4U.36.2 – you get the OEM belt length and cross-section without having to measure a worn one. From there the catalog runs through the basis frame, flail drum with bearing, distributor box, mounting frame, deflector sheets, guards and hood cross-struts, layshaft support, layshaft/clutch, the electromagnetic clutch, straw warning system, electrical equipment, and two different conversion kits for vee belt clutch setups. Each section has a clear parts breakdown with exploded views and reference numbers.

I’ve used enough third-party catalogs to know the difference. When a farmer calls me saying his KPAB machine throws straw unevenly, I need to know if the distributor box is the -Y 05147 or the +Y 05148 variant. This manual lists both, with separate part numbers for each serial number break. That’s the kind of detail that keeps your shop from ordering the wrong deflector sheet or layshaft.

KPAB-STRAW CHOPPER Variants and Serial Number Breaks

Two distinct KPAB frame variants exist. The -Y 05147 and +Y 05148. The distributor box for each has a different mounting bracket and regulation setup – section 4U.36.38 covers the -Y 05147 box, section 4U.36.39 covers the +Y 05148 box. There’s even a separate section for the electric regulation version (4U.36.40). Same story with the layshaft: -Y 06200 in one group, +Y 06201 for the later serial numbers. If you skip this check you’re bolting on parts that don’t line up. I’ve seen it.

3 Reasons to Stick with the OEM Parts Catalog

First: part numbers match the factory bin labels. Aftermarket catalogs often combine several years into one diagram and you get a part that fits nothing. Second: the exploded views show fasteners and hardware that generic catalogs leave out – things like special washers or shoulder bolts that you won’t find in a hardware store. Third: revision history. OEM catalogs get updated when BISO changes a component. Third-party reprints use the same old PDF and you end up with superseded part numbers. This catalog is the original factory file, not a scan of a scan.

Finding the Right Part Number: Using the Index on Page 1

Page 1 holds the master index. Don’t skip it. Every major assembly is listed with its 4U.36.x reference. Need knives? 4U.36.1. V-belt? 4U.36.2. Conversion kit for the BISO vee belt clutch? 4U.36.34 and 4U.36.35 – two different kits depending on your serial range. The index also covers the KPAB-specific sections like the chaff spreader (+Y 06937 / W) on 4U.36.49 and 4U.36.50. Mark your machine’s serial number, look up the section, and you’re pulling the right part number before lunch.

Safety Warnings and Proper Tool Use

Straw choppers run at high rotor speeds. Install the wrong knife bolt or miss a torque spec on the flail drum bearing and you’ve got a projectile hazard. This catalog doesn’t have a separate safety chapter – it’s a parts catalog, not a service manual – but the OEM diagrams show the correct fasteners and hardware for each assembly. Use those part numbers to order genuine bolts and washers. Don’t substitute. And when you reassemble the vee belt clutch, make sure the clutch alignment matches the KPAB layshaft section +Y 06201. A misaligned belt throws debris. I’ve got the scar on my forearm to prove it.

Factory documentation standards in the Automotive Industry Overview have set the benchmark for agricultural equipment, too. BISO follows the same logic: exact part numbers, clear assembly grouping, no ambiguity.

Related Manuals for Your Shop

• BISO Straw Chopper Parts Catalog
• Massey-Harris-Ferguson FF 30 GS 1957 Parts Catalog | OEM Fastener Guide
• Futura FC200-FC400 Parts Catalog – OEM Wear Parts Specs

Understanding how OEMs structure their documentation is key, as explained in the Automotive Industry Overview. The same discipline applies here.

Frequently Asked Questions

Does this parts catalog include service procedures or torque specs?

No. This is a parts catalog, not a service or repair manual. It contains part numbers, exploded diagrams, and assembly references. You need the separate BISO workshop manual for torque values and overhaul steps.

Can I use this catalog for both the BISO-STRAW CHOPPER and the KPAB-STRAW CHOPPER?

Yes. Both models are covered in the same 45-page document. Separate sections are provided for each variant, including serial number splits.

How do I know which KPAB variant I have?

Check your machine’s serial number plate. The catalog splits at serial numbers -Y 05147 and +Y 05148 for the basis frame and distributor box, and at -Y 06200 / +Y 06201 for the layshaft. Compare your serial to the section headings.

What if I need a conversion kit from vee belt clutch to something else?

Sections 4U.36.34 and 4U.36.35 cover conversion kits for the BISO-STRAW CHOPPER. Sections 4U.36.47 and 4U.36.48 cover conversion kits for the KPAB-STRAW CHOPPER. Each lists all parts required for the swap.

Forty-five pages of factory part data. No guesswork, no aftermarket half-truths. If you’re working on a BISO straw chopper, Access the Factory Manual and get the right parts the first time.