Midland SIDE DUMP GRAVEL TRAILER Operator's Manual page 34

4.6.1 HOOKING UP (cont'd)
11. Back slowly under trailer keeping the
king pin centered in the fifth wheel
jaws.
12. Back up until the fifth wheel coupler
locks on the trailer king pin.
13. Gently move the towing vehicle back
and forth while the trailer brakes are
engaged to check that the jaws have
locked around the king pin.
14. Set parking brake, stop engine and
dismount.
15. Visually check that the coupler jaws are
securely locked around the king pin and
the coupler release lever is in the locked
position. Release and hook up again if
the jaws are not securely locked around
the king pin.
16. Check that the trailer front frame is
resting on the fifth wheel.
17. Connect and secure the hydraulic line.
Start hydraulic pump and check that
there are no leaks.
18. Connect and secure the electrical terminal. Check
that all electrical circuits are completed and that
all lights are working.
19. Route the electrical, air and hydraulic lines to
prevent snagging, dragging and pinching.
20. Raise the landing gear.
a. Remove the anchor pins, raise leg and repin
on the drop leg style.
b. Use the crank to raise the legs if equipped
with the crank style. Stow crank.
21. Remove blocks or chocks from the wheels.
22. Perform Pre-Trip Inspection before starting.
22
Fig. 10 COUPLER LOCKS
5th Wheel
Lock