Description

Challenger MT400B 2007 Service Manual

If you are wrenching on a Challenger MT400B 2007 Service Manual is what you need on your bench. I’ve seen too many guys grab a generic ag repair book and then wonder why the transmission won’t hold pressure or the clutch fork snaps. This is the OEM factory book—506 pages, AGCO‑issued in November 2007, Issue 2. It covers everything from splitting the tractor to setting rim weights.

Challenger MT400B Service Manual: Engine and Equipment Coverage

Section 10, “Engine and equipment,” runs through the full power plant. You get the allocation of time for each repair, special tool numbers, and the exact steps to pull the cylinder head or replace an injector. Page 1 lists the warranty request procedure and fault code index – you need that before you touch a tractor that’s still under coverage. The manual doesn’t assume you’ve done this before. It tells you which wrench size fits the fuel line and what thread locker to use on the thermostat housing.

What Transmission Specs Are Provided?

Section 25, “Transmission,” is fourteen pages of pure factory procedure. You get the gear stack disassembly order, clutch pack clearances, and the hydraulic feed circuit test points. Aftermarket books skip the check valve inspection. This one shows you the factory bore gauge sizes and the plug torque for the inspection covers. If you are rebuilding the transmission on an MT400B, you need the Manual Transmission section from this manual – not a generic access. The exact shim selection process is on page 73 (the second page I’ll point you to).

3 Key Sections for Tractor Splitting

Section 2, “Splitting the tractor,” is where most DIY guys get into trouble. The manual lays out the lifting points, the special tie‑down strap requirements, and the sequence for separating the engine bulkhead from the transmission housing. It even quotes the weight of the front axle assembly so you can pick the right floor jack. I’ve had to pull a tractor out of a ditch because somebody skipped the step that says “lock the rear axle prior to splitting.” That warning is in bold type on page 2. Follow it.

Get the Right Torque for PTO Components

Section 50, “PTO drive mechanism,” covers the shaft spline tolerances, the override coupling tests, and the torque for the housing bolts. The manual gives you a table in ft‑lbs and N·m. Do not use a generic spec from an online forum – the MT400B uses a specific grade of fastener on the PTO brake disc. Your local parts house won’t tell you that. The manual also includes the failure code index, so if the PTO won’t engage you can look up code “E” and find the diagnostic tree.

Hydraulics: Factory Testing and Repair Steps

Section 70, “Hydraulics,” is 60 pages of drop‑dead precise information. Filter part numbers, relief valve settings, and the flow test procedure for the three‑point linkage. The manual even shows you how to build the test harness from the special tools list on page 3. If you are replacing O‑rings in the remote coupler block, you get the inch‑pound torque for the cap screws. None of this “tighten until snug” garbage. The factory says 108 in‑lbs on the four inner screws. Deviate and you’ll get a leak that costs you a day.

Source Validity – Why an OEM Print Matters

This manual is a direct file from AGCO’s RTS system. The pdf includes bookmarks for every section – “Introduction and warranty,” “Clutch,” “Rear axle,” “Electric equipment & instrument panel,” “Electronic equipment,” “Sheet metal,” “Tractor cab,” “Platform,” “Lighting equipment,” “Rims and wheels weights,” and the index. The original file name is Challenger_MT400B_2007_Service_Manual_en-63709017728.pdf. No reprints, no scanned copies that lost resolution. You get the exact same information a dealer pays for. For operator instructions on the MT635B family, see the Challenger MT635B MT645B MT655B MT665B Operator Instruction.

Who Should Use This Manual?

You. If you own an MT400B, whether you’re a farm owner doing your own service or a shop that takes in ag equipment, this is the baseline documentation. Beginners will appreciate the chapter structure: each section starts with the special tools required and ends with the torque chart. Experienced mechanics will use the failure code index to cut diagnosis time. Page 2 gives the complete table of contents in English, French, German, and Spanish – so even if your help speaks another language, the procedure numbers match.

Related Manuals

• Challenger Terra Gator 3244 Chassis Service Manual
• Challenger MT 655B, MT 665B, MT 600B 2005 Parts Catalog – OEM Factory Manual

To understand manual transmission theory that applies across many ag machines, refer to the Manual Transmission article on external sources – but stick to the MT400B book for your own tractor.

Frequently Asked Questions

Does this manual cover the PTO?

Yes, section 50 – PTO drive mechanism – includes tear-down, torque specs, and failure codes.

Can I use this for an MT400C or other model?

No. The MT400B is a specific model with its own engine calibration and transmission ratios. Using a manual from a different model will give you wrong torque values for the cylinder head bolts and the wrong shim stack for the differential. The 2007 edition is only for MT400B tractors built up to that year. Cross-referencing will cost you time and parts. Buy the correct manual for your serial number.

Stop guessing with aftermarket PDFs that collapse wiring diagrams into blurs. Get the factory book that San Antonio dealers used when I was a young tech turning wrenches. Access the Factory Manual now and keep it on your tablet or print it for the bench.