Coupling Trailer To Truck
10. Go under the trailer with a flashlight and look in the back of the fifth wheel. Verify the fifth wheel jaws (A) have closed around the shank of the kingpin and the fifth wheel lock lever is in the locked position. See figure 3-5.
Figure 3-5 Fifth Wheel Jaws Closed Around Kingpin Shank
11. Inflate the truck suspension (if equipped). 12. Connect the supply hose to glad hand (A), service hose to glad hand (B), electrical connector and if equipped, connect hoses to the lift axle and tailgate glad hands. See figure 3-6.
Figure 3-6 Connect Hoses And Electrical Connector 13. On walking floor trailers, connect the pressure (A) and return (B) hydraulic hoses to the couplers on the truck. See figure 3-7.
^ WARNING
Pressurized fluids can penetrate the skin. Hydraulic hoses can fail from age, damage and exposure.
Do not search for hydraulic leaks without body and face protection. A tiny, almost invisible leak can penetrate the skin, thereby requiring immediate medical attention. Use wood or cardboard to detect hydraulic leaks, never your hands.
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