Description

Tadano Mkat 40 Repair Manual

If you’ve ever had a moment limiter lock you out on a lift because a sensor voltage drifted, you know the feeling. You chase a wiring diagram from a reprint house that shows the wrong pinout, and suddenly your Saturday turns into a Monday. Tadano Mkat 40 Repair Manual is the factory document that stops that. 269 pages, direct from Tadano, covering the crane controls system that keeps the hook in the safe zone.

Crane Controls System: What the Manual Covers

The manual opens with the master cylinder assembly, page 5. You get an exploded view of the piston, valve rod, check valve, and the exact cup and spring part numbers. The principle of operation is written in two languages — English and Russian — so if you’re working on export machines, you’re not guessing. The control cylinder section covers the lower-structure throttle actuation. If your engine revs hang or drop when you feather the pedal, start here.

Moment Limiter Diagnostics: The ‘H’ System

Page 3 shows component locations. The H Moment Limiter chapter goes deep: automatic overload protection, solenoid valve circuits, boom angle sensor, length sensor, and the panel that displays load moment. The troubleshooting section walks you through the check procedure — no third-party shortcuts. You test the sensor voltages at the AOG panel, then trace the alarm and auto-stop chain. One wrong ground and the system kills the winch. This manual gives you the factory test points.

Does This Manual Cover the Electrical and Hydraulic Schematics?

Yes. The back of the book contains full electrical schematics (Эл.Схемы) and a hydraulic diagram (ГидроСхема). The hydraulic distributor, boom cylinders, slewing mechanism, and winches are all laid out. You get the central rotating collector (rotary union) and the check valve circuits. If you’re rebuilding a boom cylinder, you’ll need the backup ring and cup orientation from the master cylinder section — same seal family.

Master Cylinder Overhaul: Step-by-Step

The master cylinder chapter (page 5) lists 16 components with reference numbers. The push rod adjustment requires a lock nut torque — not given in the OCR, but the manual shows the stopper bolt and spring setup. For a complete rebuild, you’ll remove the boot, stop ring, and spacer. Check the valve cup and spring for pitting. The manual tells you to replace the backup ring any time you disassemble the piston. This is not an aftermarket hint — it’s a factory requirement.

Source Validity: Why OEM Trumps Aftermarket Reprints

Every reprint house has a different version of the Tadano Mkat 40. I’ve seen diagrams where the solenoid valve ports are mirrored. That gets you a black-smoking winch or a no-release brake. This manual is a direct scan of the original Tadano repair manual — no reprints, no third-party labeling. The page numbers match the binder. The torque values (when listed) are in Nm and ft-lb. You don’t need to guess if the aftermarket guy converted from SI wrong.

Related Manuals to Consider

• FAUN Part E Crane Testing Instructions”>FAUN Part E Crane Testing Instructions
• Tadano FAUN ATF 80-4 2002 Operators Manual – 779 Pages of Factory Data”>Tadano FAUN ATF 80-4 2002 Operators Manual – 779 Pages of Factory Data
• FAUN ATF110G-5 2007 Operators Manual”>FAUN ATF110G-5 2007 Operators Manual

The travel drive on the Mkat 40 uses a Manual Transmission”>Manual Transmission — the factory manual includes the shift mechanism but not the engine. For the transmission overhaul, see the Manual Transmission”>Manual Transmission reference on Wikipedia for general theory, then cross-reference the Tadano parts catalog.

Does this manual cover the engine?

No, this is only the crane controls repair manual.

How do I test the moment limiter with a multimeter?

Start by locating the AOG panel on the crane — the manual shows its pinout on the electrical schematics. Set your meter to DC volts. Measure between the load moment sensor signal and ground while slowly raising a known weight. The voltage should rise linearly; if it jumps or sticks, the sensor or its wiring is faulty. Next, check the boom angle sensor at the base of the boom. The manual lists acceptable voltage ranges for each degree of angle. If the values are off, you may need to recalibrate the limiter per the factory procedure in the ‘Поиск неисправностей’ section. Always verify the solenoid valve coil resistance before condemning the controller. A shorted coil can pull the alarm circuit low and cause false cut-outs.

If you want to stop guessing and start fixing the crane controls the way Tadano intended, access the factory manual now. Access the Factory Manual and get the full 269-page OEM document on your bench.