Tadano AML-C (Load Moment Indicator) Service Manual

This service manual (this document) is compiled to provide information on the AML-C that is equipped on the crane. "Input/Output Signals of the AML System" in this document offers the general description on the electrical circuit of the crane. For the detailed electrical circuit, refer to the service manual (Circuit diagrams and Data) of each model.

For the actual works, perform appropriate repair and service with referring to the separate operation and maintenance manual, parts catalog, and service manual of the applicable model. When part replacement is needed, refer to the parts catalog first to check the disassembly unit as well as the parts sales unit.

Tadano AML-C Repair Manual
The rated capacities for boom lift assume that the jib is stowed in the specified position and the main winch is used. When the jib is attached to the boom end during boom lift, subtract the value in the table below from the rated capacity. tadano cranes dealers,tadano crane dealer,tadano cranes.

Tadano AML-C Service Manual
The rated capacities for single top lift or jib lift assume that the main winch is used. If you perform single top lift or jib lift using the auxiliary winch, subtract the mass of the main hook block from the rated lifting capacity values.

Tadano AML-C Diagram of the Main System
Load moment ratio ≥ 100%: AML vent / compulsory unload of the main relief valve. If an overload occurs, the AML stops the 24-V output from Do1. Thus the solenoid valve for VENT is returned to neutral by the spring and vents the oil in the spring side of the balance piston in the main-circuit safety valve into the tank circuit. The whole oil discharged by the pump is unloaded into the tank, making crane operation toward critical sides impossible. When crane operation toward non-critical sides (hoisting down, boom raising, boom retraction) is detected, no oil is vented from the safety valve into the tank. Thus the crane operation becomes available.

Anti-twoblock (overwind) stop: If operation toward critical sides (hoisting up, boom lowering, boom extension) is attempted while the hook block is over wound, 24-V output from Do1 stops. Thus the crane operation toward critical sides becomes impossible due to AML vent (compulsory unload) in the same way as overload. When operation toward non-critical sides is detected, the operation becomes available.

Backward stability stop: When the boom is raised over the specified angle, the output from Do1 stops and the crane operation stops automatically due to AML vent. Recovery from the automatic stop is possible only by boom raising.

Working range limit stop: When the boom head approaches a pre-registered limit of the working range, slow stop function works and the AML energizes the corresponding proportional solenoid valve. It slowly closes the pilot pressure circuit for the main control valve to decelerate crane operation until the main control valve becomes neutral and the output from Do1 stops to make AML vent disable crane operation. For swing limit, however, the proportional solenoid valve makes the main control valve immediately to stop the crane. In this case the crane does not swing beyond the limit even if the AML override is activated, and it swings only toward within of the limit.

Swing Output Adjustment (Offset Method)
By the adjustment of swing output (current) Ao1, Ao2, (CN6-pin1, pin3), the stop point is adjusted. The current value to the proportional solenoid valve that controls the pilot pressure given to the swing control valve’s spool is increased by the F2 key. The speed of the swing table decreases as the amount of oil supplied from the swing control valve to swing motor is gradually decreases (opening / clearance between the swing control valve body and spool decreases). Finally, hydraulic oil is not supplied to the swing motor any more (the clearance between the valve body and spool becomes none), and the swing table stops.