Letourneau Crane PCM120

Lifting Capacity
Safe Working Load (SWL): 50 short tons (45,360 kg)
API Static Rated Load: SWL plus 3,200 lb hook block
Hoist Performance
Hoist Speed (Bare Drum, Single Line):
Loaded: 0–240 feet per minute (0–1.22 m/s)
Loaded: 0–240 feet per minute (0–1.22 m/s)
Empty: 0–360 feet per minute (0–1.83 m/s)
Empty: 0–360 feet per minute (0–1.83 m/s)
Lowering Speed: Up to 240 feet per minute (1.22 m/s)
Boom Configuration
Standard Boom Length: 100 feet (30.48 m)
Minimum Boom Length: 60 feet (18.29 m)
Maximum Boom Length: 120 feet (36.58 m)
Luffing Time (100 ft boom): 50 seconds from maximum to minimum reach at full speed
Swing Characteristics
Swing Speed: 0–2 revolutions per minute (rpm)
Swing Range: 3 full revolutions (1.5 revolutions right and left)
Dimensions & Weight
Overall Width: 16 feet 8 inches (5.08 m)
Tail Swing: 13 feet (3.96 m)
Pedestal Column Diameter: 48 inches (1.22 m)
Operating Weight: 114,000 lbs (51,710 kg)
Power & Drive Systems
Electrical Supply: 600V, 60 Hz, 3-phase, 600A external supply
Peak Power Requirement: 550 KVA (maximum load, dual-function, 20-minute duty)
Drive System:
Hoist and Luffing: N-9 DC electric motors with N3T gear reducers
Hoist and Luffing: N-9 DC electric motors with N3T gear reducers
Swing: S-1A DC electric motor with #5 gearbox
Swing: S-1A DC electric motor with #5 gearbox
Controls: Solid-state SCR converters providing DC power and regenerative braking
Braking System
Type: Regenerative electrical braking during load lowering
Holding Brakes: Disc “fail-safe” brakes applied automatically upon function stop or power loss
Operator Features
Control Station: Remote control station with 100-foot cable pendant
Monitoring: Solid-state monitoring and control of drive systems
Diagnostics: Built-in diagnostic system for simplified maintenance
Safety Features:
Limit switches for maximum boom position
Limit switches for maximum boom position
Electronic load moment computer
Electronic load moment computer
Hoist-up (anti-two-block) limit switch
Hoist-up (anti-two-block) limit switch
High-temperature and failure indicator lights at operator station
High-temperature and failure indicator lights at operator station
Emergency hook lowering feature
Emergency hook lowering feature