Description

Atlas Copco QAX 40 Dd, QAX 45 Dd, QAX 60 Dd, QAX 70 Dd 2010 Operators Manual

You’ve got a QAX 40 Dd on the truck bed and no clue how to safely disable the auto-start before you pull the fuel filter. That’s where this manual earns its keep. I’ve torqued enough head bolts to know that guessing on generator specs gets you a fried stator or a fire. This Atlas Copco QAX 40 Dd, QAX 45 Dd, QAX 60 Dd, QAX 70 Dd 2010 Operators Manual is the original factory print—not a third-party rehash. 72 pages of direct-from-Atlas Copco data: torque values for generator assemblies, cooling system capacities, and the exact sequence for the Qc1002 control panel. If you skip the manual because you think “operators” means “light reading,” you’ll miss the battery safety precautions on page 5 that keep you from shorting a 24V system. I’ve seen it happen.

Engine Overhaul and Cooling Coverage

The manual breaks down the Engine and Cooling systems in a way that saves you from pulling a radiator fan you don’t need to touch. Chapter “General description” covers the engine block, alternator, and cooling system separately. Page 34 shows the oil and oil filter change procedure with the exact drain plug torque. Most guys think any 15W40 works—this manual specifies PAROIL 5W40 and PAROIL 15W40 and calls out the viscosity grades. For the cooling side, you get the cooler cleaning schedule in the preventive maintenance table. No guesswork.

What Torque Values Are Listed in This Manual?

Torque values sit in the Technical specifications section at the back. Two tables: “For general applications” and “For important assemblies.” The important assemblies table covers cylinder head bolts, main bearing caps, and flywheel bolts—all in Imperial units (ft-lb). If you need the torque for the alternator mounting bolts, it’s in there. Page 26 also covers the spillage-free containment system bolts. Don’t trust a Chilton’s for this—aftermarket documentation skips these values and you end up with oil leaks from the generator cradle.

7 Sections of Operational Safety

Safety section runs from page 6 through page 12. Covers transport, installation, operation, maintenance, tool applications, and battery precautions. The battery safety precautions alone are worth the access: it tells you the terminal torque for the battery cables and warns against using uninsulated tools on the Qc1002 controller. One of my techs ignored the “remote start operation” warning and got zapped by a capacitor discharge. Read that section.

Qc1002™ Control Panel: Factory Procedures

The Control and indicator panel Qc1002 chapter is 8 pages of menu maps, pushbutton functions, and fail class descriptions. If the generator throws a fault code and you don’t have this manual, you’re scrolling blindly through the LCD. The manual lists each fail class (Class 1 through Class 4) and what action to take. Example: Class 2 auto-shutdown due to high coolant temp—the manual shows the exact reset procedure via the “Alarm” button sequence. No trial and error.

Alternator Troubleshooting and Wiring Diagrams

Alternator troubleshooting table on page 39 lists symptoms (low output, no voltage, overvoltage) and the likely causes. The circuit diagrams section at the back includes full wiring schematics for the QAX 40-70 Dd models. You get the earth leakage relay wiring, the IT-relay for QAX 40 and QAX 60, and the COSMOS retrofit harness. If you’re retrofitting a remote start kit, this is the only source for correct pinouts.

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For background on how generators interact with transmissions, see Manual Transmission basics and also Manual Transmission principles.

Does this manual cover the QAX 45 Dd model?

Yes. It covers all four models: QAX 40 Dd, QAX 45 Dd, QAX 60 Dd, and QAX 70 Dd.

How do I get the right torque for the generator mounting bolts?

Open the Technical specifications section. Page 26 lists torque values for general applications; the “Important assemblies” table follows. For the alternator-to-engine bolts, use the “For important assemblies” column. Each value is given in ft-lb with a metric equivalent. Do not use the conversion list on the same page until you’ve verified the original unit. Aftermarket manuals often misstate the conversion factor for these bolts, leading to stripped threads. I’ve had to helicoil two generator frames because someone used a generic torque chart. Stick with the factory numbers printed here.

You want a generator that doesn’t cook its windings or vibrate itself apart? Access the Factory Manual. It’s the same 72-page binder Atlas Copco shipped with the machine in 2010. No reprints, no missing pages. The cooling system specs, the engine oil change intervals, the fail classes on the Qc1002—it’s all there. Get it on your tablet or print it out. Either way, you’ve got the data to do the job right.