The Jockey wheel is the wheel found at the front of trailers for instance. Or in engines, it is a spring loaded wheel designed to keep tension on a belt or chain. The term came about because the wheel is used to help "jockey" the trailer in position or it "rode" on something. It is a free-turning, spring-loaded idler wheel used to keep tension on a belt or chain.
With this retractable adjustable-height wheel, Jockey wheel incorporates a caster action, permitting travel in any direction while manhandling a trailer while it is not attached to a vehicle. It is situated close to the towing hitch and has a built-in screw jack to enable the trailer nose to be lifted over the tow ball of a car or other powered vehicle. The screw jack can then be used to gently lower the trailer nose onto the tow ball. Once securely attached to the towing vehicle, the jockey wheel's jacking action is fully retracted for stowage. It is also unclamped and lifted as far as possible to give the greatest ground clearance in prior to a journey. When the setting is ready, one can clamp it again.
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