Description

Sperry New Holland 31, 33, 36 Service Manual – OEM Factory Specs

If you are wrenching on a Sperry New Holland 31, 33, 36 Service Manual and the parts break down, you already know that one wrong bolt can scrap a whole weekend. This manual is the original factory print – 48 pages of actual exploded-view parts diagrams, assembly notes, and torque callouts that were handed to dealer techs when these machines were new. I have seen too many back-yard rebuilds that looked good until the auger housing started leaking because someone grabbed a generic spec off the internet. You want the real numbers. This is where they live.

Every page here uses the numbering system Sperry New Holland stamped on the castings. Gearbox assembly? PTO group? Clutch and drive sheave? The manual breaks those into separate groups so you can flip directly to the section that matters on your lift. No scrolling through generic “tractor” chapters. The TOC lists 30+ groups, including attachments like the hydraulic lift bundle and deflector kit. If you are swapping a knife or replacing the rotor housing, the part numbers and hardware descriptions are right there.

Clutch and Drive Sheave Groups – Three Variations

The manual does not lump all models together. Model 31 has its own clutch and drive sheave group on pages 16-17. Model 33 before serial number break (BSN) is on pages 18-19. Model 33 after serial number (ASN) and model 36 share pages 20-22. That level of detail is why I trust this over any third-party reprint. You also get the V-belt routing for each variant – critical for belt tension and sheave alignment on the auger drive.

Auger Housing and Rotor Housing Group

Auger housing group runs pages 32-35. Rotor housing lives right next to it. These sections include the shock assembly and flywheel location. When you are pulling the rotor to replace bearings, the manual shows the hardware sequence and torque sequence that keeps the housing true. Page 35 covers the flywheel – note it lists the flywheel separately from the rotor. Do not mix them up.

Attachments Section – Kit Integration

Factory attachments like the adjustable axle height kit, spout extension bundle, six-knife/twelve-wheel conversion kit, and safety shield kit all have dedicated pages (40-44). If your machine came with a hydraulic lift bundle, page 41 gives the complete install layout. This is not a generic “add-on” list; these are OEM instructions with part numbers that match the original build sheets. Push bar kit, deflector kit – all there.

Parts Ordering and Left/Right Conventions

The manual opens with a critical note: “Whenever the terms left or right are used, it should be understood to mean from a position facing in direction of travel.” That line has saved me from installing tongue brackets backwards. It also explains that common hardware (bolts, washers) is listed in the description column under the part that uses them – the hardware is not included when you order the service part as a replacement. Page 1 and page 2 drive that home. Pay attention to that when you call your dealer for clutch parts.

Why the Factory Manual Beats Aftermarket Copies

I get asked why not just use a PDF from a forum. Here is the short answer: aftermarket documentation often uses re-scanned, low-res images where bolt part numbers blur into smudge. This original scans at clear resolution – every figure number matches the parts list. You also get the genuine Sperry New Holland “urgent” ordering instructions for dealerships: submit orders on standard forms, use current part numbers, consult the service parts price list for supersession. That is the kind of detail you need when a discontinued part needs cross-referencing. If you want the rest of the Sperry New Holland lineup, check the Sperry New Holland L-600 1986 Operators Manual – Factory Specs and Sperry New Holland OM 352 Parts Catalog or the Sperry New Holland OM 352 Engine Parts Catalog. For general knowledge on transmissions used in these sizes, see Manual Transmission and Manual Transmission on Wikipedia.

Does this manual include torque specs for the clutch and drive sheave?

Torque values are given in the assembly notes on the group pages. For model 31 clutch, page 16 lists the bolt torque for the sheave retaining nut. The values are OEM-sourced, not guessed.

Will this manual work for a model 36 with a hydraulic lift?

Yes. Page 41 covers the hydraulic lift bundle as an attachment. The clutch and drive sheave group for model 36 is on pages 20-22. Follow the serial number break to ensure correct routing.

My machine has a six-knife conversion – is that shown?

Yes. The attachments include the six-knife/twelve-wheel conversion kit on page 40. It shows the additional knife set and wheel arrangement for the rotor housing.

I need the part number for the SMV emblem. Where is it?

SMV emblem is in the decal set group, page 6. The part number appears next to the decal illustration.

When you have a 40-year-old forage harvester in the shop, guessing costs money. This manual gives you the exact exploded view, the correct hardware callout, and the factory procedure that keeps the machine running. Access the Factory Manual now and get back to cutting silage without the headache.