HOW TO FIGURE OVERHAULING WEIGHTS

This is a conservative method of approximating the load block weight required to overhaul the wire rope properly on crane applications.

TAKE:  Approximate weight of wire rope on backside of boom (Table A: x boom length)
    +       Pull required to overcome friction of hoist drum (nominally 100 pounds)
    x       Overhaul factor for number of load lines (Table B)
    =       Required weight of load block

TABLE A: WIRE ROPE WEIGHT		TABLE B: OVERHAUL FACTORS
SIZE	LBS. PER FT., 6 X 19 WRC	NO. LINES	ROLLER BEARING SHEAVES	BRONZE BUSHED SHEAVES
3/8	.26	1	1.03	1.05
7/16	.36	2	2.07	2.14
1/2	.46	3	3.15	3.28
9/16	.59	4	4.25	4.48
5/8	.72	5	5.38	5.72
3/4	1.04	6	6.54	7.03
7/8	1.42	7	7.73	8.39
1	1.85	8	8.94	9.80
1-1/8	2.34	9	10.20	11.30
1-1/4	2.89	10	11.50	12.80

EXAMPLE:
5 Parts 7/8" wire rope. 50' boom, roller bearing sheaves.
Required Weight = [A(50) + 100] B =[1.42(50) + 100] 5.38 = (171) 5.38 = 920 Ibs.