Handbook of Winching Techniques for 4 Wheel Drive Vehicles
Handbook of Winching Techniques 01 INTRODUCTION 02 THE THEORY OF WINCHING 03 ACCESSORIES USE OF A PULLEY BLOCK USE OF A NYLON SLING AND SHACKLE USE OF GLOVES 04 RULES FOR SAFE OPERATION GENERAL SAFETY HAULING SELF RECOVERY Superwinch Ltd., Abbey Rise, Whitchurch Road, Tavistock, Devon. Great Britain. PL19 9DR Tel: +44 (0)1822 614101 Fax: +44 (0)1822 615204 support@superwinch.net Superwinch Inc., Winch Drive, Putnam, Connecticut 06260 U.S.A. Tel: (860) 928 7787 Fax: (860) 928 1143 www.superwinch.
01 INTRODUCTION INTRODUCTION Please read and understand this handbook before using your Superwinch adn it’s accessories. It has been supplied with your winch to encourage safe operation - if used unsafely or improperly, there is a possibility that property damage or personal injury can result, since your sfety ultimately depends on your caution when using these products. Pay particular attention to the RULES FOR S A F E OPERATION in this handbook.
THE THEORY OF WINCHING 02 THE THEORY OF WINCHING To get the best from your Superwinch and auxilliary equipment requiers some understanding of the mechanics involved in winching. For winching purposes the resistance to motion of a vehicle is dependant on 4 main factors: (i) (ii) (ii) (iv) The inherent resistance to movement of the vehicle. The total weight of the vehicle. The nature of the surface to be transited. The gradient up which the vehicle is required to be moved.
THE THEORY OF WINCHING If we combine the weight of the vehicle, the type of surface to be transited and the gradient to be overcome we get the calculation. Weight of vehicle Surface to be transited + Gradient 60 + (G x W) 60 x Weight of Vehicle Therefore the winching formulae is W S Where W = S= G= = Effort Required Weight of vehicle Surface to be transited Angle of gradient (in degrees) i.e. Vehicle weighing 4,500 lbs is to be winched up a sand dune of dry loose sand with a slope of 15 degrees.
ACCESSORIES 03 THE THEORY OF WINCHING The most important aid to successful winching (after the winch) is the pulley block), which can be used to increase the pulling power of the winch or for indirect pulls. Pulley blocks can be used in two modes. (a) attached to the load and (b) secured to an anchor point. The anchor point, when used, must be secure, using a tree, another vehicle or any firm structure to which a pulley block can be attached with a chain or stout rope.
Fig. 4 Indirect pull where vehicles access is limited due to unsuitable ground or obstructions, using a pulley block attached to suitable anchor point. Actual pulling power on load will be 1000 lbs at winch rope speed. USE OF A NYLON SLING 2.1 A shackle should always be used when attaching winch hooks to nylon slings. NOTE: The shackle must pass through both eyes of the sling. The Safe Working Load of the nylon sling is based on the use of both eye ends. USE OF GLOVES 3.
RULES FOR SAFE OPERATION 04 RULES FOR SAFE OPERATION Your Superwinch is a very powerful machine. Treat it with respect, use it with caution, and always follow these safety guidelines. Your Superwinch is specifically designed for the movement of goods and materials. In an emergency situation where the lives of people are endangered take every precaution including those listed below. 1. GENERAL - applicable in all instances 2.
RULES FOR SAFE OPERATION 04 GENERAL SAFETY 1.8 Avoid continuous pulls from extreme angles as this will cause the rope to pile up at one ed of the drum (Fig. 8). Always aim to get the rope as straight as possible to the direction of the vehicle. 1.9 Never operate the winch without the rope fairlead fitted. Operator injury or winch damage can result if a fairlead is not installed. 1.10 Never engage or disengage winch clutch when there is a load on the winch. 1.
SELF RECOVERY 3.3 When the driver’s attempt to regain vehicle tracion is successful, he or she should take care not to overrun the rope and risk the possibility of it being trapped under the vehicle. 3.4 Use can be made of the pulley block to increase effective pull. In this case however, the hook is attached to the vehicle itself, but care must be taken to connect with a secure chassis frame point. Fig.
This Manuals Part No. is : 5-001-193 Issue No. 2 Superwinch Ltd., Abbey Rise, Whitchurch Road, Tavistock, Devon. Great Britain. PL19 9DR Tel: +44 (0)1822 614101 Fax: +44 (0)1822 615204 support@superwinch.net Superwinch Inc., Winch Drive, Putnam, Connecticut 06260 U.S.A. Tel: (860) 928 7787 Fax: (860) 928 1143 www.superwinch.
