Overview
ISO 7752-2:2011 - "Cranes - Control layout and characteristics - Part 2: Basic arrangement and requirements for mobile cranes" defines the basic arrangement, direction of movement and ergonomic requirements for the primary controls of mobile cranes (as defined in ISO 4306-2). The standard covers slewing, hoisting/lowering, boom luffing and boom telescoping controls, addressing both bi-directional and multi‑directional (cross‑shift) control layouts. It is intended to be used together with ISO 7752-1 (General principles).
Key topics and requirements
- Control functions covered: slewing, load hoisting and lowering, boom luffing, boom telescoping and associated fly jib controls.
- Control types: hand levers, foot pedals, and cross‑shift (multi‑directional) levers; alternative foot‑pedal arrangements are permitted for some functions.
- Directional conventions: specifies consistent lever and pedal movements (e.g., pull back to hoist/raise, push forward to lower/extend; lateral movements for slewing or luffing depending on arrangement) to reduce operator confusion.
- Remote control stations: relative positions and movements must follow the same arrangements; provisions required for stopping motions on control‑signal malfunction and for emergency stop.
- Ergonomics and placement: basic controls must be within easy reach of the operator at the control station.
- Operating force and travel limits:
- Hand lever operating force ≤ 160 N
- Foot pedal operating force ≤ 225 N
- Maximum travel from neutral to forward/reverse ≤ 260 mm (applies to hand levers and foot pedals)
- Neutral/return characteristics: levers and pedals must provide means to hold neutral without positive locking and should return to neutral automatically when released unless intentionally restrained for function.
- Integration: other crane controls (travel, steering, brakes) may be installed near the basic controls provided they do not cause confusion or physical interference.
Applications and users
ISO 7752-2:2011 is primarily used by:
- Crane manufacturers and designers - to standardize control layouts and meet ergonomic/safety requirements.
- Control system and remote‑control designers - to implement correct signal, stop and emergency features.
- Safety engineers, certifiers and regulators - to assess compliance with recognized control conventions.
- Training organizations and fleet operators - to harmonize operator controls across different models, reducing human error when operators transfer between cranes.
Practical benefits include improved operator safety, reduced risk of incorrect control inputs in normal and emergency situations, and simplified operator training due to standardized control conventions.
Related standards
- ISO 7752-1: Cranes - Control layout and characteristics - Part 1: General principles (intended companion document)
- ISO 4306-2: Cranes - Vocabulary - Part 2: Mobile cranes (defines mobile crane terminology referenced by ISO 7752-2)
Keywords: ISO 7752-2:2011, mobile crane control layout, crane controls standard, slewing control, hoisting control, boom luffing, boom telescoping, cross‑shift levers, remote control station, crane operator ergonomics, crane safety.