WARNING
Keep the fifth wheel plate lubricated to prevent
binding between the tractor and trailer. A binding
fifth wheel could cause erratic steering and loss of
vehicle control, possibly resulting in serious per-
sonal injury or death.
3. Position the tractor so that the fifth wheel lock
opening is in line (both vertically and horizontally)
with the trailer kingpin. The kingpin should be in a
position to enter the throat of the locking mecha-
nism, as shown in Fig. 11.5. Adjust the trailer land-
ing gear to give enough alignment height for posi-
tive kingpin lockup.
4. With the fifth wheel lock opening aligned with the
trailer kingpin, back the tractor slowly toward the
trailer, making sure that the kingpin enters the
throat of the locking mechanism. Continue the
backward motion until positive lockup occurs.
5. Apply the tractor parking brakes.
6. Make a visual and physical check for positive king-
pin lockup. When lockup has occurred, the fifth
wheel control handle will have moved to the locked
position. Make sure that the safety latch is down
over the lock control handle. See Fig. 11.6. This will
hold the control handle in the locked position.
7. Release the tractor parking brakes. Test for kingpin
lockup by pulling on the trailer against the chocks.
1
1
2
2
A
B
12/05/94
f310265a
NOTE: Make sure the safety latch is down when the
control handle is locked.
A. Unlocked B. Locked
1. Lock Control Handle 2. Safety Latch
Fig. 11.6, Fontaine Fifth Wheel, Locking and Unlocking
Fifth Wheels
11.8
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