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r i ,. r--, rte, r-7 f`"" . r-i r -t rte, r-i r-i. r-i r-i r-t f".'wU cn. • Keep the cathead clean and free drust,oil and grease.Rust Do not leave a cathead unattended with the rope wrapped should be removed from the cathead with a wire brush having on the drum. a handle. • Position all other hoist lines to prevent contact with the • Check the cathead periodically,when the engine is not run- operating cathead rope. ning, for rope wear grooves. If a rope groove forms to a depth greater than 118 in. (3 mm), replace the cathead. • Always use a clean,dry, sound rope.A wet or oily rope may "grab" the cathead and cause drill tools or other items to be rapidly hoisted to the top of the mast. • Should the rope "grab" the cathead or otherwise become tangled in the drum,release the rope and sound an appropriate alarm for all personnel, including the operator, to rapidly back away and stay clear.If the rope"grabs"the cathead,and tools are hoisted to the sheaves at the top of the mast,the rope will often break, releasing the tools. If the rope does not break, stay clear of the drill rig until the operator cautiously returns to turnoff the drill rig engine and appropriate action is taken to release the tools. Keep careful watch on the suspended tools and quickly back away after turning off the engine. • Always protect the rope from contact with chemicals. :- - Chemicals can cause deterioration of the rope that may not be = detected visibly. • Never wrap the rope from the cathead(or any other rope,wire rope,or cable on the drill rig)around a hand,wrist,arm,foot,ankle, legs,or any other part of the body. • Always maintain a minimum of 18 inches of clearance between the operating hand and the cathead drum when driv- ing samplers,casing, or other tools with the cathead and rope method. Be aware that the rope advances toward the cathead with each hammer blow as the sampler or other drilling tool advances into the ground. • Never operate a cathead(or perform any other task around a drill rig) with loose, unbuttoned, or otherwise unfastened clothing or when wearing gloves with large cuffs or loose straps or lacings. • Do not use a rope that is any longer than necessary.A rope that is too long can form a ground loop or otherwise become en- tangled with the operator's legs. When using the cathead and rope for driving or back driving, • Do not use more rope wraps than are required to hoist a make sure that all threaded connections are tight and stay as far load. away as possible from the hammer impact point. -27- -28-