Description

Ingersoll Rand 1112H 1991 Parts Catalog

If you’re trying to rebuild an Ingersoll Rand 1112H without the factory parts catalog, you’re wasting time and risking wrong parts. I’ve seen it. Some joker uses an aftermarket diagram and ends up with a bolt that’s two thread pitches off. This 1991 Parts Catalog is the only document that shows you exactly what was on the line when that 1112H left the factory. 23 pages, no fluff, no guesswork. You need the right part number before you touch a wrench.

Engine Assembly Breakdown: Governor, Crankshaft, and Flywheel

The engine section starts on page 37 of the index grid. You get exploded views of the governor, oil filter, starter, carburetor, counterweight, crankshaft, and flywheel with stator. Each part has a reference number, part number, and quantity. Need a replacement bolt for the crankshaft counterweight? Look for part number 55159 – 1/2″ x 2-1/2″ hex bolt. The manual tells you the exact stud and lock washer specs. No need to measure threads yourself.

Does the Manual Cover the Suspension?

Yes. The 39″ lawn tractor model 1112H has a dedicated mower suspension assembly section. That includes the chassis and hood assembly, fender, and the suspension hardware. If your deck is sagging or the linkage is sloppy, you flip to that grid and order the correct brackets and pins. The suspension section is listed under the tractor index – page numbers vary but the grid coordinates (e.g., A15-A162) point you to the exact illustration. This is how you stop guessing which bolt fits the suspension arm.

23 Pages of Factory Parts Indexing

This catalog has two indexes. The front index is alphabetical by major groups – tractor, engine, and so on. The rear index is numerical, listing every part number and the page where it appears. You don’t need to scan through 23 pages blindly. Find the part number in the rear index, note the grid (like C10 for the governor), and go straight there. That’s efficiency. I’ve used these Ingersoll Rand catalogs since the ’90s; the grid system saves you twenty minutes of flipping.

Read the Parts List Like a Pro

When you open to any assembly page, you’ll see reference numbers in boxes next to the illustrations. Those box numbers are not for ordering – they just point to the parts list. The actual part number is listed in the table. Look for codes: UAR means “Use as required” (quantity varies), NSD means “Not sold separately” (you buy the whole assembly), and O/L means “Obtain locally”. If you see a ** footnote, read the note for identification details. This may sound like rookie stuff, but I’ve watched guys order the wrong part because they didn’t check the NSD flag.

OEM vs Aftermarket: Why This Catalog Wins

Aftermarket parts lists often skip the footnotes and misplace grid coordinates. This is the original Ingersoll Rand publication from 1991 – S-91-R9-500-212. Every part number was verified against the production line. You won’t find generic cross-reference errors. If you’re serious about keeping that 1112H running, you use the factory source. Pair this with a full service manual for torque specs and you’ll have the complete picture. Check out the Ingersoll-rand T-708H 2000 Parts Catalog – Factory Specs for a similar compact tractor, or the Ingersoll-rand RT-706H, RT-708H 2004 Parts Catalog | OEM Factory Manual if you’re working on a different series. For larger machines, the Ingersoll-Rand SD 70 SD 77TF Parts Catalog: 352-Page Factory Manual gives you the same level of detail.

What years and models does this cover?

This catalog is for the 1991 Ingersoll Rand 1112H compact lawn tractor only.

How do I read the reference numbers?

Each illustration has reference numbers in boxes – those are just for locating the part in the list. The actual part number is in the parts list table next to the reference number. Always order by the part number, not the box number. Also pay attention to codes: UAR means the quantity varies, NSD means the part is only sold as part of an assembly, and O/L means you buy it locally. If a part has a ** footnote, read the note below the table – it might specify a different thread pitch or material. This system prevents the wrong bolt from ending up in your crankshaft housing.

That’s the difference between a catalog that sits on the shelf and one that gets greasy. You don’t need to guess the right part when the factory already did the work. Access the Factory Manual now and start ordering the right parts for your 1112H. For more background on the automotive industry, Automotive Industry Overview.