COUPLING A TRAILER

Position the tractor directly front the trailer .

Back the trailer slowly until the fifth wheel just contacts the trailer

Place the transmission neutral and apply the parking brakes.

Connect the trailer glad hands and electrical connector

Caution

Make sur e the trailer air lines and the trailer electrical cor d e operly supported they will not pinched caught while the tractor being backed under the trailer .

Check that the fifth wheel height matches the height the underside the trailer . the trailer too high, use the landing gear lower the trailer until fifth wheel and trailer height match. the vehicle equipped with air suspension and the trailer too low , use the air suspension control switch exhaust air from the suspension air bags until fifth wheel and trailer height match.

Caution

Failur e match fifth wheel height with trailer height will r esult the trailer being impr operly connected.

Back under the trailer slowly until the trailer king pin engages. Back slowly avoid hitting the king pin too hard, and stop soon the king pin locked into the fifth wheel.

equipped with air use the air suspension control switch reinflate the suspension air

Raise the trailer landing gear slightly f the ground.

With the trailer parking brakes pull the tractor ahead slightly ensure that the trailer locked onto the tractor https://www.truck-manuals.net/mack/

10. Push the trailer air supply valve (red octagonal knob) supply the trailer system with air pressure. With the air system normal operating pressure, check the trailer air brake system for excessive leakage and proper operation.

1 Inspect the coupling ensure the trailer properly Make sure there space between the fifth wheel and the trailer plate and that the fifth wheel jaws have closed around the shank the king Check that the locking lever the position and make sure the safety latch position over the locking lever wheel chocks were placed the trailer remove the chocks and

12. After ensuring that the trailer properly connected, raise the landing gear its maximum height.

Caution

equipped with air suspension, NOT operate the vehicle with the suspension air bags deflated. Always r einflate the suspension air bags after coupling uncoupling a trailer .

https://www.truck-manuals.net/mack/