Description

International Harvester 70, 100 Service Manual

Most DIY guys I see trying to resurrect an old Cub Cadet end up with stripped threads, wrong shims, or a brake that grabs because they trusted some forum post. That’s why I keep factory manuals on my bench. This International Harvester 70, 100 Service Manual is the real deal – 37 pages of the same Blue Ribbon Service document IH issued to dealers in the 1960s. It covers the chassis of the Model 70 and 100 tractors: clutch, brake, reduction drive, transmission, differential, rear axles, front axle, steering, and the creeper attachment. I won’t pretend it covers the engine or ignition – those are in a separate manual (GSS-1350). But if you’re tackling steering slop, transmission noise, or a clutch that won’t disengage, this is the only piece of paper you should follow.

Blueprint for the Chassis: What’s Inside the Manual

Flip to page 8 and you’ll find the full specifications table – gear ratios, tire pressures, bearing preloads, all in Imperial units. Page 13 starts the transmission disassembly, with step-by-step instructions for pulling the main shaft and replacing the shift forks. The manual doesn’t assume you already know the procedure; it lists the required tools (including IH specials, but you can improvise) and gives you the exact sequence to avoid breaking the cast-iron housing. Chapters cover steering assembly (page 10), front wheel bearing adjustment (page 12), and front axle removal (page 13). Each section has exploded diagrams with part numbers – you won’t guess which washer goes where.

Does This Manual Cover the Engine?

No. This is strictly the chassis service manual for the 70 and 100. The engine, fuel system, and ignition are covered in the companion engine manual GSS-1350. If you need carburetor specs or valve clearances, you’ll want that separate manual. But if you’re pulling the rear end or rebuilding the steering box, this is the one you need.

3 Reasons to Own the Factory Service Manual

Reason one: torque values. Page 8 gives you every fastener spec – from the clutch cover bolts to the differential bearing cap. Reason two: the brake adjustment procedure is explained in two paragraphs, not a paragraph and a half of vague hints. Reason three: the creeper attachment (underdrive) is covered in its own section, with shim selection and input shaft alignment. I’ve seen three different aftermarket “manuals” get the creeper input bearing preload wrong – here it’s spelled out correctly.

Get the Right Torque Data from Page 8

Page 8 isn’t just specs – it tells you the lubricant type and capacity for each component. Use 80W-90 gear oil in the transmission and differential, but the reduction drive gets a different fluid. The manual also lists the recommended pressures for the front and rear tires. Don’t rely on a generic chart; this is the factory data for this specific tractor weight and tire size.

Creeper Attachment: Factory Disassembly Procedure

The creeper (also called underdrive) is a tricky unit because the shim pack controls end play. The manual shows the order of disassembly, the puller tool you need, and the measurement procedure for reinstalling the shims. I’ve seen guys ruin these by prying on the housing – the manual says to use a two-jaw puller. Following it saves you from buying a new gear set.

Who Should Buy This Manual

Home garage enthusiasts who own a Cub Cadet 70 or 100. Professional mechanics working on vintage IH equipment. Avoid if you only need engine data. This manual isn’t a glossy reprint; it’s a scanned OEM document with some age, but every spec is original. You get the same instructions a dealer would have used.

Before you order aftermarket parts or start spinning wrenches, get the factory procedures. The transmission rebuild section alone is worth the access – you’ll avoid mixing up the idler gears. Related manuals that pair well with this one include International Harvester Cub Cadet Tractor Service Manual – OEM Factory Specs (the companion engine manual) and International Harvester L-LINE R-LINE 2009 Service Manual for later models. Also check International Harvester 73, 106, 107, 126, 127 Service Manual – OEM Specs if you have a bigger Cub. For background on diesel engines that later Cub Cadets used, read this Wikipedia article on diesel engines. And if you want to understand how manual transmissions work in general, Manual Transmission has a good overview.

Stop wrenching blind. Access the Factory Manual now and keep it on your tablet or print it out. Your toolbox will thank you.

Does this manual cover the engine?

No. This is the chassis manual only – the engine is in GSS-1350.

What torque specs are given?

Page 8 lists every fastener torque for the clutch, brake, transmission, differential, and steering. For example, the differential bearing cap bolts are spec’d at 35–40 ft-lb, and the transmission main shaft nut at 50–60 ft-lb. The manual also gives you the correct lubricant capacities and types for each component. These specs are from the original IH engineering department, not a third-party guessing game. I’ve caught aftermarket books listing the wrong values – this one is correct because it came from the factory.