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Vehicle Recovery
Towing

Equipment Operator Basic - Beginning construction equipment operators manual
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Figure 5-7.—Mechanical advantage and change of direction (winching). Figure 5-8.—Winching by change of direction lifting,  and  towing)  of  the  trucks  to  complete  the recovery. To upright an overturned truck with a wrecker truck, Overturned   Truck Figure 5-8 shows a mechanically disabled 2 1/2-ton truck nosed off a narrow road in such a way that the wrecker  cannot  be  positioned  directly  behind  the vehicle. You may notice that the winch cable is not running in a direct straight line with the winch. On a normal winch, this angle causes the wire rope to wind off the side (flange) of the winch drum; however, the wrecker  winch  has  a  level  winding  device  that  offsets the difference. Other vehicles with winches do not have this  device. 5-9 you should use a sling method of attachent, because a pulling force applied to only one point of the frame can result in a bent frame. A sling lifting attachent is made up of either two utility chains or two 1-inch fiber ropes. The sling ends are attached to the front and rear lifting devices on the high side of the overturned truck. Then the winch cable is attached to the center of the sling. A holding force is required to prevent the overturned vehicle from crashing onto its wheels. The holding force







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