Thern 482 Owner's Manual
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Thern 482 Owner's Manual

Worm gear hand winches
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Read this Own er's Man u al
thor ough ly be fore op er at ing
the equip ment. Keep it with
the equip ment at all times.
Re place ments are avail able
from Thern, Inc., PO Box 347,
Winona, MN 55987,
507-454-2996.
www.thern.com
IMPORTANT: Please record
product information on
page 2. This information is
re quired when calling the
fac to ry for service.
A6112F-0507
Owner's Man ual
For Thern
Worm Gear Hand Winches

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  • Page 1 Keep it with the equip ment at all times. Re place ments are avail able from Thern, Inc., PO Box 347, Winona, MN 55987, 507-454-2996. www.thern.com IMPORTANT: Please record product information on page 2.

  • Page 2: Two-Year Limited Warranty

    Thern, Inc. warrants its products against defects in material or workmanship for two years from the date of purchase Please record the following: by the original using buyer, or if this date cannot be established, the date the product was sold by Thern, Inc. to the Date Purchased: dealer.
  • Page 3 Read and comply with the guidelines set forth in this Owner’s Manual. Keep this manual, and all labels attached to the winch, readable and with the equip ment at all times. Contact Thern, Inc. for replacements. Check lubrication before use.
  • Page 4 FOR STANDARD PRODUCTS referred to in this manual, use 3/8 inch coarse thread fasteners, grade 5 or better, torqued dry to 30 ft-lbs without lubrication for Models 462 and 4622PB. Use 1/2 inch coarse thread fasten- ers, grade 5 or better, torqued dry to 75 ft-lbs without lubrication for Models 472, 4722PB, 482 and 482B.
  • Page 5 Owner's Manual for Thern Worm Gear Hand Winches page 5 Installing the Breather Plug Check if a breather plug is installed to vent heat and pressure from the gear- box. Failure to do so could result in pressure buildup which can cause the gearbox to leak or damage the equipment.

  • Page 6: Installing The Handle

    6 Owner's Manual for Thern Worm Gear Hand Winches Installing the Handle FOR MODELS 462, 472, 482 AND 482B, install the handle as follows, see 1.3.1 Figure 3 – Handle fi gure 3. Adjustment INSERT THE HANDLE in the handle socket, adjust handle length to suit larger turning radius: the operation, and tighten the set screw to hold it in place.
  • Page 7 WE RECOMMEND 7 x 19 galvanized aircraft cable for diameters up to 5/16 inch, and 6 x 37 IWRC improved plow steel wire rope for diameters of 3/8 inch and up. FOR MODELS 462 AND 4622PB anchor the wire rope using the cable 1.4.2 anchor. See fi gure 5.
  • Page 8 8 Owner's Manual for Thern Worm Gear Hand Winches FOR MODELS 472, 4722PB, 482 AND 482B anchor the wire rope using 1.4.3 the recessed anchor. See fi gure 4B. PASS THE END OF THE WIRE ROPE through the anchor hole, until at least 1/2 inch of rope extends out the other side.

  • Page 9: General Theory Of Operation

    Owner's Manual for Thern Worm Gear Hand Winches page 9 General Theory of Operation THE PULL REQUIRED to move the load must not exceed the load rating of 2.1.1 Important! the winch. Consider the total force required to move the load, not the weight of the load.

  • Page 10: Preparing For Operation

    10 Owner's Manual for Thern Worm Gear Hand Winches Breaking-In the Winch BREAK-IN OCCURS during the fi rst few hours of normal operation. Dur- 2.2.1 ing break-in, mating surfaces become polished, and clearances increase. This is desired for effi cient operation of bearings and gears.

  • Page 11: Attaching The Load

    Owner's Manual for Thern Worm Gear Hand Winches page 11 Attaching the Load Figure 7 – Attaching Load Do not wrap the wire rope around the load. This damages the wire rope and could cause the load to escape. Use a sling or other approved lifting device.
  • Page 12 12 Owner's Manual for Thern Worm Gear Hand Winches Cleaning the Winch Clean the winch to remove dirt and help prevent rust and corrosion. Important! CLEAN THE WINCH every six months or whenever it is dirty. 3.1.1 Increase the frequency of main te - nance procedures if the winch is: WIPE ALL EQUIPMENT to remove dirt and grease.
  • Page 13 Owner's Manual for Thern Worm Gear Hand Winches page 13 Lubricating the Winch Important! Do not over lubricate the brake bushings. Over lubricating may cause oil to • Do not leave plug holes in the leak onto the friction discs, which may damage the friction discs or result in gearbox open.

  • Page 14: Inspecting The Equipment

    14 Owner's Manual for Thern Worm Gear Hand Winches Inspecting the Equipment Important! Do not use damaged or malfunctioning equipment. Place an “OUT OF OR DER” • Start an inspection program as sign on the winch. Do not use the winch until the sign is removed by a qual i fi ed soon as you put the winch into maintenance person who has completely corrected the prob lem.
  • Page 15 • Whenever you return the winch ponents. Contact factory for assembly/disassembly instructions. Disas- to service from storage. sembly of the gearbox before contacting Thern, Inc voids all warranties. • Whenever you notice damage • Check the fi nish for wear, fl aking, or other damage.
  • Page 16 • Contact factory for assembly/disassembly instructions. Disassembly of in cor rect correct the gearbox before contacting Thern, Inc voids all warranties. The wire rope assembly must be PLACE enough weight to keep the wire rope straight and tightly drawn. replaced if the diameter measures less than the minimum diameter at •...
  • Page 17 Owner's Manual for Thern Worm Gear Hand Winches page 17 Table 1 – Inspection Checklist checked boxes indicate damage or problem in need of repair damages problems general fi nish weathered, fl aking, otherwise damaged winch jerks or hesitates during operation...
  • Page 18 Owner's Manual for Thern Worm Gear Hand Winches Table 2 – Troubleshooting Chart Contact the factory for detailed instructions on re-sealing the gearbox if you are required to disassemble the gearbox for any reason. Disassembly of the gearbox before contacting Thern, Inc. voids all warranties. problem cause correction handle turns, drum doesn’t turn...
  • Page 19 Owner's Manual for Thern Worm Gear Hand Winches page 19 Repairing the Winch GET FACTORY AUTHORIZATION for all repairs. Unauthorized repairs 3.4.1 Important! will void the warranty, and may lead to damage or failure of the winch. • It is your responsibility to de- REPLACE DAMAGED OR POORLY OPERATING PARTS with Thern 3.4.2...
  • Page 20 20 Owner's Manual for Thern Worm Gear Hand Winches Transporting the Winch DRAIN OIL from the gearbox. 4.1.1 Important! REMOVE THE BREATHER PLUG and install a sealed oil plug to prevent 4.1.2 • Keep a record of what you ship, the loss of lubrication during shipment.
  • Page 21 (for lifting) 5/16 Please contact factory or nearest Thern Distributor for fi rm fi xed price and delivery. Actual drum capacities may be 25-30% less, due to nonuniform winding. Wire rope tension will also affect drum capacity. Approximate handle force required to lift 1000 lb with an empty drum, and maximum handle length.
  • Page 22 22 Owner's Manual for Thern Worm Gear Hand Winches Worm Gear Hand Winch Models 462 and 462V item description part number qty. GEARCASE C1404 CAPSCREW HEXHD .312-18NC X 3.000 ZNPL GR5 A3503 NUT HEX .312-18NC ZNPL GR2 A3250 INPUT SHAFT...
  • Page 23 Owner's Manual for Thern Worm Gear Hand Winches page 23 13 14 15 16 14 15 A6112F-0507...
  • Page 24 24 Owner's Manual for Thern Worm Gear Hand Winches Worm Gear Hand Winch Models 4622PB and 4622PBV item description part number qty. GEARCASE C2681 CAPSCREW HEXHD .312-18NC X 3.000 ZNPL GR5 A3503 HEX NUT .312-18NC ZNPL GR2 A3250 WASHER HELSPRLK .312 X .586 X .078 ZNPL...
  • Page 25 Owner's Manual for Thern Worm Gear Hand Winches page 25 10 11 2 3 4 31 18 19 20 21 22 23 24 25 26 27 3 A6112F-0507...

  • Page 26: Outboard Bearing

    26 Owner's Manual for Thern Worm Gear Hand Winches Worm Gear Hand Winch Models 472 and 472V item description part number qty. GEARCASE C1392 CAPSCREW SOKHD .250-20NC X 1.250 ALYSTL A3288 HEX NUT .250-20NC ZNPL GR2 A3200 CAPSCREW HEXHD .312-18NC X 3.250 ZNPL GR5 A3404 HEX NUT .312-18NC ZNPL GR2...
  • Page 27 Owner's Manual for Thern Worm Gear Hand Winches page 27 8 9 10 11 12 13 18 19 21 22 A6112F-0507...

  • Page 28: Bearing Housing Assembly

    28 Owner's Manual for Thern Worm Gear Hand Winches Worm Gear Hand Winch Models 4722PB and 4722PBV item description part number qty. GEARCASE C1339 CAPSCREW SOKHD .250-20NC X 1.250 ALYSTL A3288 HEX NUT .250-20NC ZNPL GR2 A3200 CAPSCREW HEXHD .312-18NC X 3.250 ZNPL GR5 A3404 HEX NUT .312-18NC ZNPL GR2...
  • Page 29 Owner's Manual for Thern Worm Gear Hand Winches page 29 23 24 25 27 28 A6112F-0507...
  • Page 30 30 Owner's Manual for Thern Worm Gear Hand Winches Brake Assembly for Model 4622PB and 4722PB C3823 item description part number qty. BRAKE COVER A1105 BRAKE HOUSING/BEARING ASSEMBLY C2678 RETAINING RING 1.750 SST A3883 BRAKE DRIVE ASSEMBLY B4210 CAPSCREW HEXHD .375-16NC X 1.500 SST...
  • Page 31 Owner's Manual for Thern Worm Gear Hand Winches page 31 Brake Assembly for Model 462PB-P3 C1544 item description part number qty. BRAKE COVER A1105 BRAKE HOUSING/BEARING ASSEMBLY C2678 RETAINING RING 1.750 SST A3883 DRIVE ASSEMBLY B2337 CAPSCREW HEXHD .375-16NC X 1.500 SST...

  • Page 32: Handle Assembly

    32 Owner's Manual for Thern Worm Gear Hand Winches Worm Gear Hand Winch Models 482 and 482V item description part number qty. GEARCASE C3425 CAPSCREW SOKHD .250-20NC X 1.250 ZNPL A4568 HEX NUT .250-20NC ZNPL GR2 A3200 CAPSCREW HEXHD .500-13NC X 5.000 ZNPL GR5 A3247 HEX NUT .500-13NC ZNPL GR2...
  • Page 33 Owner's Manual for Thern Worm Gear Hand Winches page 33 23 24 21 22 8 9 10 A6112F-0507...
  • Page 34 34 Owner's Manual for Thern Worm Gear Hand Winches Worm Gear Hand Winch Model 482B and 482BV item description part number qty. GEARCASE C3425 CAPSCREW SOKHD .250-20NC X 1.250 ZNPL A4568 HEX NUT .250-20NC ZNPL GR2 A3200 CAPSCREW HEXHD .500-13NC X 5.000 ZNPL GR5 A3247 HEX NUT .500-13NC ZNPL GR2...
  • Page 35 Owner's Manual for Thern Worm Gear Hand Winches page 35 27 28 25 26 12 13 14 15 A6112F-0507...
  • Page 36 Thern, Incorporated 5712 Industrial Park Road Winona, MN 55987 PHN 507-454-2996 FAX 507-454-5282 EMAIL: info@thern.com www.thern.com...

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