Changing direction causes the vehicle’s weight to move to the outside of the turn which, unless the driver controls its speed, can lead to the vehicle rolling over or sliding out. Centrifugal force is affected by the vehicle speed and the angle of turn. In other words, the faster the vehicle is going and/or the tighter the turn, the more likely the driver is to lose control of the vehicle and for it to roll over. DRIVERS DUTIES and RESPONSIBILITIES
Disconnecting a Tractor Unit from a Semi-Trailer
Pre Uncoupling
Ensure: The trailer will be parked whenever possible, on level ground with a suitable hard surface The trailer will not obstruct a public highway or thoroughfare The skid plate of the semi-trailer is some 2 inches lower than the top of the 5 th wheel height
Uncoupling Procedure
6
5
4
3
2
1
When uncoupling a trailer you should work from the rear of the vehicle towards the front
1. Apply trailer handbrake and wind down landing legs 2. Disconnect air and electrical lines in an orderly fashion, the nearest first, and attach to holding frame 3. Remove spring clip from 5 th wheel coupling. 4. Pull the handle strongly and lock by moving it forward to engage handle notch on 5 th wheel plate 5. Before you enter the vehicle cab take a moment to think through the procedure you have just completed, ask yourself: Is the trailer brake on? Are the landing legs down? Have you disconnected all cables? 6. Drive the tractor unit forwards slowly the 5 th wheel mechanism will automatically assume the coupling up position.
21
Made with FlippingBook - Online Brochure Maker