Description

Terex Demag AC 350 Technical Manual

If you’re working on a Terex Demag AC 350, you already know it’s a 350-ton crane that doesn’t tolerate guesswork. I’ve been turning wrenches for 28 years, and I can tell you the difference between a job that goes smooth and one that turns into a nightmare is having the right numbers in front of you. This is the factory Terex Demag AC 350 Technical Manual – 2440 pages of OEM procedures, not some aftermarket rewrite. You want to know how much torque goes on the counterweight bolts? It’s in here. Need the swing brake adjustment sequence? Chapter 8. Everything I’m about to describe is taken straight from the original file: TerexDemag_AC_350_Technical_Manual_en-45713007808.pdf.

Safety Protocol: What Chapter 1 Demands

Chapter 1, Sikkerhetsanvisninger (Safety Instructions), runs from page 3 to page 81. It covers correct use, operating conditions, load classification, and 30 pages of specific safety rules. I’ve seen guys skip the section on multiple crane cooperation risks – that’s how you drop a load. This chapter spells out the hand signals for travel and work movements, both general and specific. If you’re new to big crawlers, read the ergonomics section on page 13. It tells you how to set up the cab so you don’t wreck your spine over a 12-hour shift. The manual also lists the standards and calculation regulations the crane was designed to. That’s the kind of data you won’t find in a generic repair guide.

Crane Structure and Dimensions – What Chapter 2 Includes

Chapter 2, Oppbygging av kranen, gives you the complete breakdown of the superstructure, safety-relevant components like ladders and walkways, and all the placards in the cab and on the chassis. You get the lighting layout and emergency exit locations. For a crane this size, knowing where every access point is matters when you’re doing a pre-trip inspection. Another resource is Terex Demag Standard Crane Technical Manual – 160 Pages of Factory Specs if you need a smaller-frame reference for common components. But for the AC 350, this chapter is your single source for structural dimensions.

How Does the Telligent Engine System Work?

Chapter 5, Motor, dives into the Telligent engine management system. It covers start procedure, warm‑up of the hydraulics, shutdown, and even the optional emergency stop circuit. There’s a section on the independent coolant pre‑heater with its own control panel. If you’re troubleshooting a no‑start, the manual walks you through the start‑assist procedure on page 37. I’ve chased electrical ghosts on these cranes before – the factory wiring diagrams in this manual are worth the price alone. Compare with Terex Demag AC 155 Technical Manual – Factory Specs & Dimensions for a smaller engine setup, but the Telligent system here is specific to the 350.

9 Counterweight Configurations Explained

Counterweight setup is where most mistakes happen. Chapter 9, Motvekt, dedicates over 60 pages to combinations from 0 tons up to 82 tons (180.8 kip). Each combination has its own section with separate mounting and dismounting steps. For example, the 52 t (114.6 kip) combination shows the exact lifting sequence and which bolts get torqued first. The manual lists the load capacity table for assembly and disassembly on page 7. Forget the sequence, and you’re looking at a bent frame or a dropped counterweight. For related equipment, see Terex Demag CC4800 2011 Technical Manual – Official Specs – it uses a similar counterweight logic.

Get the Right Torque Data from Chapter 9

Every fastener on the counterweight assembly has a listed tightening specification in both Nm and ft‑lbs. The manual gives you the tightening angle where required – not just a number, but the turn sequence. I’ve had aftermarket manuals say “tighten securely” – that’s worthless when you’re dealing with 1‑inch bolts. This manual tells you the exact torque for each bolt and when to use thread locker. Understanding basic Manual Transmission principles helps with the gearbox, but stick to the factory procedure for the crane’s drivetrain. For general knowledge, Manual Transmission fundamentals apply to the carrier gearbox, but don’t rely on them for the superstructure swing drive.

Why OEM Documentation Should Be Your Only Source

Aftermarket manuals for a crane like this are dangerous. They often omit critical safety chapters (like the 30‑page section on multiple crane cooperation) or convert metric torque values incorrectly. This file is a direct scan of the factory binder – every diagram, every table, every warning is exactly as Terex Demag published it. The 2440 pages cover the cab, engine, swing, counterweight, and the full safety framework. No reprints, no condensed versions. If you’re a shop owner or a freelance mechanic, this is the documentation you want on your tablet when the customer asks why you need an extra hour.

Does this manual cover all AC 350 variants?

Yes. This edition covers the full AC 350 series from serial number 350-0000 onward.

What types of torque values are included?

Every threaded fastener on the crane has a listed torque value in both Nm and ft‑lbs. That includes the counterweight bolts, swing gear fasteners, engine mounts, and even the cab mounting bolts. The manual provides the tightening sequence and angle where required. I’ve seen manuals skip the angle and leave you guessing – this one doesn’t. Page references for torque tables are clearly marked in each chapter, so you’re not flipping through 2000 pages blind.

If you’re going to keep this crane in service, you need the factory data. Access the Factory Manual from AutoRepairManuals and put it on your shop tablet.