Warren Elevating 5
th
Wheel
31
Coupling and Locking
Operator Instructions
1.
Open the king pin jaws by pushing the air control button in the cab.
2.
Align the tractor with the trailer.
3.
Raise the 5th wheel plate until it is 1 to 2 inches above the bottom of the trailer king pin
plate. Make sure the pick up ramps are properly aligned and slanted to permit smooth
coupling.
4.
Back the tractor under the trailer, bringing the jaws into contact with the trailer pin with
some force. Backing speed should be 2 or 3 mph.
5.
You may hear a snap, one sign that the jaws may have locked.
However, this is not a
sure sign.
Release the air control for the Jaw Release
6.
When you think that you are locked, hook up the trailer air lines.
7.
Visually check the lock status. Do this by looking at 1 inch round rod extending from the
front center of the 5th wheel plate.
a.
If the jaws have locked, the rod will extend from 1/2 to 1 inch beyond the front of
the plate.
b.
If the jaws are unlocked, the rod will extend more than 1 inch beyond the front of
the plate.
8.
If you will be traveling on the road, engage the Road Lock by pulling up on the handle
and sliding the rod in toward the center of the chassis frame. If the rod will not move
over and engage, you are not fully locked! In this case, repeat the coupling and locking
operation once again, making sure you are using reasonable speed to provide enough
force to lock the jaws.
9.
Test the locking and coupling. If you think the jaws are locked, attempt to pull the tractor
away from the trailer with the trailer brakes set. To do this, get back into the cab and
apply the trailer brakes only. Put the tractor in gear and try to move forward — slowly. If
the tractor does not move, the jaws are locked.
10.
If the tractor moves away from the trailer, the jaws are not locked. In this case, repeat the
coupling and locking operation once again, making sure you are using reasonable speed
to provide enough force to lock the jaws.
11.
If the jaws still do not lock, refer to “Repairs” section later in this manual.
