Thern Winch
Manufacturing Winches for Over 50 Years

Big performance from small winches.

Thern's Durahoist cast aluminum winches are powerful, rugged and lightweight - the perfect combination of features for portable power winches. Machine cut helical/worm gear enclosed oil bath and durable finish give them a long service life. Ball bearings ensure smooth operation, and accessory options let you fit them to your specific tasks.

Series 477 Helical/Worm Gear
Power Winches
Up to 2000 lb capacity

• Machine Cut Worm Gears for accurate and long lasting service.
• Enclosed Oil Bath provides continuous lubrication of gears to minimize wear. Oil seals keep oil in and dirt out.
• Internal Mechanical Brake provides positive load control.
• Cast Aluminum construction for lightweight strength, with durable paint finish to resist corrosion.
• Ball Bearings ensure smooth and efficient operation.
• Series 4777 is designed with a 4 inch wide drum for tight fleet angle installations.
• Accessory Options include limit switches, cable pressure plates, torque limiting controls, and manual overrides.
• 2-year Limited Warranty

Selected Models
	Thern Winch Model 4771 for lifting or pulling up to 2000 pounds
	Thern Winch Model 4771PN pneumatic winch for lifting or pulling up to 2000 pounds
	Thern Winch Model 4771HY hydraulic winch for lifting or pulling up to 2000 pounds.

Heavy Duty Power Winches
Up to 6,300 lb capacity

• 115/230 volt single phase, or 230/460 volt three phase, 60 cycle, flange mounted, TEFC, reversible, class B insulated, brakemotor rated for continuous duty in ambient temperatures up to 104Æ F (40Æ C). Standard motors comply with relevant standards including NEMA MG1, ANSI, and CSA.
• Brakemotor with spring set, electrically released disc brake is standard. Other brakes available.
• Worm and spur gears are hardened for durability. Worm gears operate in an oil bath enclosed in high strength die cast 380 aluminum alloy gearcase. Double lip oil seals keep oil in and contaminants out. Corrosion resistant construction and large capacity bearings ensure long life. Worm gear reducer meets AGMA standards. Gearing is 65 to 85% efficient. Low backdrive efficiency improves load control in lifting applications.
• Self aligning flange style ball bearings with cast housing maintain smooth drum rotation.
• Drum includes outside flange anchors to allow uniform winding and help extend wire rope life.
• Fabricated frame captures both ends of drum shaft for added security, and is easily altered for modified drum widths.
• Clutch option allows the drum to freespool for rapid pay out of wire rope. Use clutch models for horizontal pulling only.
• Motor options include: air or hydraulic; voltage or phase changes; class F or H insulated; multispeed motors; or special ratings including IEEE 45 Marine Duty, Tropical Duty, Severe Duty, and Explosion Proof.
• Control options include: drum control switches for up to 7.5 hp; 115 volt single phase controls with 8 ft. power cord and grounded plug; pendant control switch on 6 ft. cord for 115 volt single phase models up to 1 hp; or NEMA 4 rated Electric Motor Controls with pendant control on up to 50 foot cord. See controls for more information. (link to page 13)
• Standard winch is designed for base mounting, easily altered for wall or ceiling installation.
• Standard options and modifications include: cable pressure bars, limit switches, manual overrides, grooved drums, multiple compartment drums, modified drum widths or diameters, and special finishes for protection in harsh or hazardous environments. See options and modifications for more information. (link to page 15)
• ANSI B30.7 compliance available. If you require compliance with ANSI B30.7, please contact the factory with complete application information.
• 2-year Limited Warranty - view warranty

Selected Models
	Thern Winch Model 4WS1M for lifting or pulling up to 1500 pounds
	Thern Winch Model 4WS3M for lifting or pulling up to 3500 pounds Includes brake.
	Thern Winch Model 4WS6M clutch model for horizontal pulling only up to 6500 pounds
	Thern Winch Model 4WS6M Special shown with pneumatic motor and controls.

Heavy Duty Power Winches
Up to 76,000 lb capacity

• 115/230 volt single phase, or 230/460 volt three phase, 60 cycle, flange mounted, TEFC, reversible, class B or F insulated, brakemotor rated for continuous duty in ambient temperatures up to 104� F (40� C). Standard motors comply with relevant standards including NEMA MG1, ANSI, CSA, IEC, and ABS.
• Brakemotor with spring set, electrically released disc brake is standard. Other brakes available.
• Gears are heat treated for durability and operate in an oil bath enclosed in a high strength cast gearcase. Double lip oil seals keep oil in and contaminants out. Corrosion resistant construction and large capacity bearings ensure long life. Reducers meet AGMA standards.
• Self aligning flange style ball bearings with cast housing maintain smooth drum rotation.
• Drum includes outside flange anchors to allow uniform winding and help extend wire rope life.
• Fabricated frame captures both ends of drum shaft for added security, and is easily altered for modified drum widths.
• Clutch option available on some series, allows the drum to freespool for rapid pay out of wire rope. Use clutch models for horizontal pulling only.
• Motor options include: air or hydraulic; voltage or phase changes; class F or H insulated; multispeed motors; or special ratings including IEEE 45 Marine Duty, Tropical Duty, Severe Duty, and Explosion Proof.
• Control options include: NEMA 4 rated Electric Motor Controls with NEMA 4X rated pendant control on up to 50 foot cord. See controls for more information.
• Standard winch is designed for base mounting, easily altered for wall or ceiling installation.
• Standard options and modifications include: cable pressure bars, limit switches, manual overrides, grooved drums, multiple compartment drums, modified drum widths or diameters, mechanical torque limiters, and special finishes for protection in harsh or hazardous environments. See options and modifications for more information.
• ANSI B30.7 compliance available. If you require compliance with ANSI B30.7, please contact the factory with complete application information.
• 2-year Limited Warranty

Selected Models
	Thern Winch Model 4WS for lifting or pulling up to 76,000 pounds
	Thern Winch Model 4HS for lifting or pulling up to 76,000 pounds
	Thern Winch Model 4HS clutch models, for horizontal pulling only up to 56,000 pounds
	Thern Winch Model 4HPF for lifting or pulling up to 25,000 pounds
	Thern Winch Model 4HPFC clutch models, for horizontal pulling only up to 15,000 pounds
	Thern Winch Model 4HWF for lifting or pulling up to 8000 pounds

TA Series Air Powered Winches
Up to 23,600 lb capacity

• Welded steel frame and drum.
• Radial piston air motor.
• Minimum 18:1 D:d ratio.
• Meets ASME B30.7 design requirements.
• Manual band brake rated at 150% winch capacity.
• Motor mounted control valve.
• 2-year Limited Warranty - view warranty

Selected Models
	Thern Winch Series TA for lifting or pulling up to 23,600 pounds

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