Manitowoc Published 12-10-19, Control # 258-05 3-3
MLC90A-1/MLC100-1 OPERATOR MANUAL OPERATING CONTROLS AND PROCEDURES
Item Description
1 HOIST—With forearm vertical, forefinger pointing up, move hand in small horizontal circles.
2LOWER—With arm extended downward, forefinger pointing down, move hand in small horizontal circles.
3 USE MAIN HOIST—Tap fist on head. Then use regular signals.
4 USE WHIPLINE (Auxiliary Hoist)—Tap elbow with one hand. Then use regular signals.
5 RAISE BOOM—Arm extended, fingers closed, thumb pointing upward.
6LOWER BOOM—Arm extended, fingers closed, thumb pointing downward.
7
MOVE SLOWLY—Use one hand to give any motion signal and place other hand motionless in front of hand
giving the motion signal (hoist slowly shown as an example).
8
RAISE BOOM & LOWER LOAD—With arm extended, thumb pointing up, flex fingers in and out as long as
load movement is desired.
9
LOWER BOOM & RAISE LOAD—With arm extended, thumb pointing down, flex fingers in and out as long as
load movement is desired.
10 SWING—Arm extended, point with finger in direction of swing of boom.
11 STOP—Arm extended, palm down, move arm back and forth horizontally.
12 EMERGENCY STOP—Both arms extended, palms down, move arms back and forth horizontally.
13 TRAVEL—Arm extended forward, hand open and slightly raised, make pushing motion in direction of travel.
14 DOG EVERYTHING—Clasp hands in front of body.
15
TRAVEL (Both Tracks)—Use both fists in front of body, making a circular motion about each other, indicating
direction of travel forward or backward. (For Land Cranes Only).
16
TRAVEL (One Track)—Lock the track on side indicated by raised fist. Travel opposite track in direction
indicated by circular motion of other fist, rotated vertically in front of body. (For Land Cranes Only).
17 EXTEND BOOM (Telescoping Booms)—Both fists in front of body with thumbs pointing outward.
18 RETRACT BOOM (Telescoping Boom)—Both fists in front of body with thumbs pointing toward each other.
19 EXTEND BOOM (Telescoping Boom)—One Hand Signal. One fist in front of chest with thumb tapping chest.
20
RETRACT BOOM (Telescoping Boom)—One hand signal. One fist in front of chest, thumb pointing outward
and heel of fist tapping chest.
Table 3-1. Standard Hand Signals for Controlling Crane Operations
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