Description

Sperry New Holland 370 Parts Catalog

You’ve got a 370 Hayliner Baler in the shed that needs a new plunger head or a broken tine. You pull up some aftermarket parts site, punch in “370 baler tine,” and get twelve different results—none with a part number that matches the hole spacing. That’s the frustration I see every week from guys who call my shop after wasting a week on wrong parts. This Sperry New Holland 370 Parts Catalog is the original factory document, 151 pages long, printed by Sperry New Holland in Aylesbury, England. It organizes every single part by group—not by guesswork. If you’ve ever had a machine down because the wrong bolt showed up, you’ll understand why this catalog matters.

The catalog splits the baler into groups: Group 1 through Group 44 cover everything from the base frame (Group 1) to the knotter assembly (Group 44). Each group lists every part with its factory part number, description, and a code column that ties it to a specific machine serial number range. Page 5 of the catalog spells out the rules: left and right are from the operator’s position facing travel. That’s not optional—if you flip it, your plunger arm goes on backwards. The catalog also includes an N.B. column for special notes, like when a part was superseded or needs a specific fastener grade.

Why This Parts Catalog Matters for Your 370 Hayliner Baler

Aftermarket parts catalogs are often photocopies of reprints with no serial number breakdowns. They’ll list a “universal” plunger head that fits five different models—meaning it fits none exactly. This manual came straight from Sperry New Holland’s service parts division. It replaces earlier issues (496766 and 496824) and includes all updates up to issue 496942. When you order a part from this catalog, you give the dealer the model number, serial number, and part number. That’s it. No returns. No wasted trips to the parts counter.

I’ve seen a guy try to fit a Group 22 flywheel key from a generic supplier on a late-model 370. The key was ¼-inch too short. The baler sheared it in ten minutes. The OEM part is keyed to the exact length and hardness. This catalog gives you that number—so you don’t have to measure and hope.

3 Ways to Use This Catalog Correctly

First, locate your machine’s serial number. It’s stamped on a plate near the left-hand side of the main frame. Write it down. Then, find the group number for the assembly you’re working on. The table of contents on pages 3-4 lists every group from 1 to 44. Second, cross-reference the part number against the CODE column footnotes—some parts are only for machines above a certain serial break. Third, always use genuine Sperry New Holland parts.

That last point isn’t marketing fluff. The catalog says it on page 5: “ALWAYS USE GENUINE SPERRY NEW HOLLAND PARTS.” They printed it in bold. Aftermarket copies won’t have that because they don’t control the metallurgy. The plunger knife, for example, is heat-treated to a specific Rockwell hardness. A cheap knockoff will chip and ruin the shear pin slot.

Does This Catalog Cover Your Machine’s Serial Number?

Check the footnotes under each group. The catalog was issued in 1975 and covers 370 balers produced up to that date. If your machine has a serial number that falls into the range listed, every part listed applies. If your baler is a later model that used different components (e.g., a change from a twine disc to a plastic knotter), you’d need the corresponding revised issue. For the vast majority of 370 Hayliner Balers built through the mid-70s, this catalog is the one you want.

One more thing: the catalog is multilingual—English, French, German, Italian, Dutch. So if you’re working with a Spanish-speaking crew, the part numbers are still the same. The illustrations are black-and-white line drawings with callouts; no photographs. That’s fine because the drawings highlight the exact shape and orientation of each part.

OEM vs Aftermarket: Factory Parts Data Wins

I’ll say it straight: aftermarket parts catalogs are the reason I have a torque wrench with a serial number tattooed on it. They cut corners on illustrations, leave out footnotes, and often renumber groups. This original Sperry New Holland document uses the same group numbers and part numbering system that New Holland dealers still use today. If you walk into a dealer with a part number from this catalog, they’ll find it. Try that with a PDF you scraped off a forum. The dealer will shrug and ask for a serial number you don’t have. Save yourself the headache.

Related factory manuals you should look at: Sperry New Holland OM 352 Parts Catalog – 48 Pages of Factory Parts Data covers the OM 352 engine used in some New Holland equipment. Sperry New Holland OM 352 Parts Catalog – 66 Pages offers an expanded version of that engine catalog. Sperry New Holland OM 401 Parts Catalog – OEM Factory Parts Data is for the larger OM 401 engine. For a broader understanding of how automotive-grade parts documentation evolved, see the Automotive Industry Overview. Also check Automotive Industry Overview for manufacturing standards.

FAQ – Sperry New Holland 370 Parts Catalog

Can I use this catalog to rebuild the baler from scratch?

No. This is a parts catalog, not a service manual. It tells you what part to buy, not how to install it. You need the separate service manual for repair procedures.

How do I find the correct part number if my machine has a modification?

Look at the footnotes under each group. The CODE column lists the machine serial number range. If your baler falls outside that range, you’ll need the updated issue. Write down your full serial number (including any prefix letters) and compare it to the ranges listed. If the part is listed with an N.B. note like “used after Serial No. 12345,” that’s your answer. Also check the replacement issue column—Sperry New Holland sometimes supersedes parts without changing the group. For example, the plunger head assembly might have a different part number for balers built after a certain month. This catalog spells that out in the footnotes.

Does it include torque specs for bolts?

No. Torque values are not in parts catalogs. They’re in the service manual. The only specs here are fastener class callouts like “Grade 5” or “8.8” in the description column.

Is the PDF searchable?

Yes. The digital version is OCR’d with multilingual text. You can search by part number, group number, or description. The original printed pages are laid out for quick scanning, but the PDF preserves the exact page order and footnotes.

That 151-page catalog sitting on your screen right now is the same one that New Holland dealers used to stock their parts bins. It’s not a reprint or a generic compilation—it’s the original factory issue. If you need a plunger head for a 370 Hayliner Baler built before 1976, this is the document that tells you which one to order. Access the Factory Manual now and stop guessing which part fits.