As we all know, body language plays a very important role in people’s daily communication. It is especially true in the communication between crane operators. Cranes are commonly used in the construction of towers and industry, which is very noisy. To make sure the operators can “hear” the instructions and communicate with others effectively, lots of hand signals created and used. Knowing these meanings of all these hand signals is the first step for people to become a qualified crane operator. As for common people, having a basic knowledge about these signals can help them deal with some emergent situations happening on construction sites related with cranes, which are quite often. Here are the most commonly used hand signals during crane lifting operation.
1. HOIST. Raise the forearm vertically and extend the right arm straight out with forefinger pointing up. Then, move hand in small horizontal circle.
2. LOWER. With an arm extended downward, forefinger pointing down, move the hand in small horizontal circles.
3. STOP. Extend right arm down with wrist bent, palm down and open.
 Hoist |
 Lower |
 Stop |
4 SWING. Right arm away from body, point with finger in direction of swing of boom.
5. RAISE BOOM. Fingers closed and thumb pointing upward while extending the right arm straight out.
6. LOWER BOOM. Fingers closed and thumb pointing downward while extending the right arm straight out.
 Swing
|
 Raise Boom |
 Lower Boom |
7. BRIDGE TRAVEL. Extend the right arm forward, hand open and slightly raised and make pushing motion in direction of travel.
8. TROLLEY TRAVEL. Thumb pointing in direction of motion with palm up and fingers closed, jerk hand horizontally.
9. EMERGENCY STOP. Extend right arm, palm down and move hand rapidly left and right.
 Bridge Travel |
 Trolley Travel |
 Emergency Stop |
10. MULTIPLE TROLLEYS. For block marked 1. hold up one finger, and two fingers for block marked 2. Regular signals come next.
11. RAISE BOOM & LOWER LOAD. Right arm extended and thumb pointing up. Flex fingers in and out as long as load movement is needed.
12. LOWER BOOM &RAISE LOAD. Right arm extended and thumb pointing down. Flex fingers pointing in and out as long as load movement is needed.
 Multiple Trolleys |
 Raise the Boom and Lower the Load |
 Lower the Boom and Raise the Load |
13. DOG EVERYTHING. Hold hands in front of the body.
14. MOVE SLOWLY. One hand gives any motion signal while the other hand motionless in front of hand giving the motion signal.
15. MAGNET IS DISCONNECTED. Spread both hands.
 Dog Everything |
 Move Slowly |
 Magnet is Disconnected! |
Tags: crane operator, hand signals
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