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The NBT55 series boom truck is the largest capacity boom truck to date from National Crane, available in 50- and 55-ton versions. The crane boasts fully integrated machine control and LMI, which is a first for the boom truck market. The crane also includes a new outrigger beam position sensing system to aid in load chart selection. Four or five-section boom: The Series NBT50 can be equipped with two different boom lengths 31,1 m (102 ft) and 39,01 m (128 ft). Deluxe tilting operator’s cab: The Series NBT50 operator’s cab includes: all-steel construction with 0⁰ to 20⁰ hydraulic tilting capability and acoustical lining and tinted glass throughout, air conditioning, deluxe seat with arm rest mounted single-axis electric controllers, windshield and sliding skylight with electric wipers, diesel heater with defroster, circulating fan, fire extinguisher, and dual cab mounted work lights. Innovative outrigger design: Equipped with left, right ground level and in-cab outrigger controls. The Series NBT50 outriggers allow quick and easy crane set-up and includes a new outrigger beam position sensing system that aids the operator in selecting the right load chart based on the crane’s outrigger footprint. The front outrigger box has an X-shaped footprint that eliminates the need for a single front outrigger. Multiple counterweight configurations: Two-piece 1360,8 kg (3000 lb) each (total 2721,6 kg [6000 lb]) hydraulically removable counterweight slabs; removable counterweight slabs can be stowed on front outrigger box for roading. Lift Solutions and exclusive truck customizations:
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| Body | |
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| Chassis | Torsion-resistant, high-strength steel sub frame attached using high-strength steel mounting brackets that are welded to the sub-frame and bolted to the truck chassis using Huck® bolts to ensure a secure and maintenance-free connection. Rear bumper under ride protection standard. Fixed boom rest mounted to front outrigger box and fabricated from structural steel. |
| Cab | Cab structure: rigid galvanealed steel structure, well insulated, offering optimum operator visibility and comfort. Equipped with tilting cab feature from horizontal to +20°, tinted safety glass, fixed front window with windshield wiper and washer, sliding skylight window with windshield wiper, sliding left side glass door, sliding right side window for ventilation w/ safety grille, tilting rear window for ventilation, four way adjustable, cushioned/heated seat and armrests with seat belt, diesel-fired warm-water heater with air ducts at operators feet, left side of cab and front dash — standard, hydraulic-powered air conditioner — standard, circulation fan, bubble level, adjustable sun visor, dome light, cup holder, fire extinguisher, load chart binder with tear-proof paper load charts and operator manual. Armrest control functions are arranged per ASME B30.5: Two single axis electric joystick controllers for swing, boom telescope, main hoist, auxiliary hoist (optional), boom lift, warning horn button, swing park brake switch, hoist rotation indicator, tilt cab up/down, main hoist high/low speed switch, and aux hoist high/low speed switch (optional). Outrigger controls: front console mounted electronic keypad allowing the operator to activate all horizontal beams and vertical jacks. Pre-selection capabilities to easily activate more than one function for ease of setup. Rigging remote: Standard wireless rigging remote stored and charged inside the crane cab which allows the operation of the main and (optional) aux hoist to stow and unstow the hookblocks at front bumper of truck chassis for transport or operation. If the crane is equipped with an optional single front outrigger (SFO), this remote allows for raising and lowering of this vertical outrigger. Foot controls: engine throttle (electronic), dynamic swing brake (electronic), boom telescope (electronic, if equipped with aux hoist option). |
| Slew | Continuous 360° rotation using (1) low speed, high torque motor with a manually adjustable swing adjustment valve integrated to the hydraulic motor control manifold mounted to a planetary reduction gear. A proportional electronic brake pedal located in the operator cab allows for the dynamic application of the multi-disk swing brake circuit. A separate spring-applied, hydraulic-released brake for disabling rotation can be activated from the left-hand seat armrest. Free-swing functionality is disabled when using the optional crane radio remote control. |
| Dimensions | |
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| Wheelbase | 280" |
| Gross Axle Wt Rating (GAWR) | Front: 20,000 lbs. Rear: 66,000 lbs. |
| Max Tip Height | 179' |
| Hydraulic | |
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| Hydraulic System | Efficient closed-center, load sense hydraulics system featuring flow-sharing technology allowing for smooth multifunction operation of all crane functions. One (1) SAE-C mounted, 130cc axial piston pump for all functions and optimized system performance. Shaft input of 2200 RPM generating 288 lpm (76 gpm) max flow at 310 bar (4500 psi) max operating pressure. 143 gal (541 L) hydraulic reservoir with SAE o-ring connections and integrated butterfly shut-off valve for easy maintenance. SAE o-ring hydraulic fittings and hoses throughout. Boom lift, boom telescope, main and aux hoist(s) and vertical outrigger jacks are all equipped with counterbalance valves for controlled movement and load holding. Hydraulic oil cooler: standard electric fan, plate and fin style oil cooler mounted in the rear of the superstructure to remove heat from the hydraulic oil under heavy operating conditions. |
| Jib | FJM-OS 2-section offsettable |
| Operational | |
|---|---|
| Outriggers | Full Span Front: 23.25 ft. (7.09 m) Rear: 24.25 ft. (7.39 m) Mid Span Front: 15.5 ft. (4.72 m) Rear: 16.08 ft. (4.9 m) |
| Capacity | 55 T (49.9 t) |
| Boom | Includes proportional extension via multi-stage hydraulic cylinder and cable operation, four-plate, high-strength steel construction, three-sheave, quick reeve boom nose and Easy-Glide wear pads. |
| Winch | Planetary |
| Boom | |
|---|---|
| Boom Extensions | 45' |
| Boom Type | 5-section |
| Boom Length | 128 ft. (39 m) |
| Max Tip Height-Boom | 135' |
| Lift Speed | Low: 19-191 fpm (5.8-58.2 m/min.) High: 38-383 fpm (11.6-116.7 m/min.) |
| Max Jib Length | 45 ft. (13.7 m) |
| Boom Elevation | One (1) double-acting, hydraulic cylinder with integral holding valve with integral pressure transducers provides elevation from -8° to +80°. |
| Battery | |
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| Electrical System | Automotive grade, fully wire harnessed 12VDC electrical system using state-of-the-art sealed connectors and control modules. Dual-tone backup and outrigger motion alarm located at rear of machine. LED marker and triple ID lights. |
*Price, if shown, is Manufacturer's Suggested Retail Price (MSRP) and does not include government fees, taxes, dealer freight/preparation, dealer document preparation charges or any finance charges (if applicable). MSRP and/or final actual sales price will vary depending on options or accessories selected.
