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Boom, Attachments, and Upper Structure Boom Design - Five section, formed construction of extra high tensile steel consisting of one base section and four telescoping sections. The two plate design of each section has multiple longitudinal bends for superior strength. Each telescoping section extends independently by means of one double-acting, single stage hydraulic cylinder with integrated holding valves. Boom 38-140 ft (11.6-42.7m) five section boom Integral boom dolly connection Five boom extend modes (EM1 through EM5), controlled from the operator's cab, provide superior capacities by varying the extension of the telescoping sections: EM1 extends to 140.0 ft (42.7m) EM2 extends to 127.3 ft (38.8m) EM3 extends to 115.8 ft (35.3m) EM4 extends to 102.0 ft (31.1m) EM5 extends to 76.5 ft (23.3m) Mechanical boom angle indicator Maximum tip height for each extend mode is: EM1 is 148 ft (45.1m) EM2 is 135 ft (41.1m) EM3 is 124 ft (37.8m) EM4 is 110 ft (33.5m) EM5 is 84 ft (25.6m) Boom Wear Pads Wear pads with Teflon inserts that self-lubricate the boom sections Bottom wear pads are universal for all boom sections Top wear pads are universal for all boom sections Boom Head Five 16.5 in (41.9cm) root diameter nylon sheaves to handle up to ten parts of line Easily removable wire rope guards Rope dead end lugs on each side of the boom head Boom head is designed for quick-reeve of the hook block Boom Elevation One double acting hydraulic cylinder with integral holding valve Boom elevation: -3° to 80° Auxiliary Lifting Sheave - Optional Single 16.5 in (41.9m) root diameter nylon sheave Easily removable wire rope guards Does not affect erection of the fly or use of the main head sheaves Hook Blocks and Balls - Optional 40 ton (36.3mt) 4 sheave quick-reeve hook block with safety latch 60 ton (54.4mt) 4 sheave quick-reeve hook block with safety latch 90 ton (81.6mt) 6 sheave quick-reeve hook block with safety latch 8.5 ton (7.7mt) swivel and non-swivel hook balls with safety latch 10 ton (9.1mt) swivel and non-swivel hook balls with safety latch Fly - Optional 35 ft (10.7m) one piece lattice fly, stowable, offsettable to 2°, 15°, 30°, and 45°. Maximum tip height is 182 ft (55.5m). 35 ft-58 ft (10.7-17.7m) two piece bi-fold lattice fly, stowable, offsettable to 2°, 15°, 30°, and 45°. Maximum tip height is 205 ft (62.5m). Fly Extensions - Optional One 16 ft (4.9m) lattice extension, equipped with two 16.5 in (41.9cm) root diameter nylon sheaves, to be mounted between the boom head and fly options. Maximum tip height is 221 ft (67.4m). Two 16 ft (4.9m) lattice extensions, one equipped with two 16.5 in (41.9cm) root diameter nylon sheaves, to be mounted between the boom head and fly options. Maximum tip height is 237 ft (72.2m). Minimum of 14,500 lb (6 577.1kg) of counterweight required.