Warren Elevating 5
th
Wheel
15
Installation of the 5
th
Wheel on Tractor
CAUTION:
Before welding, grinding or burning on any GASOLINE-POWERED
tractor, remove all fuel tanks, then drain and plug all fuel lines.
CAUTION:
On ALL tractors, disconnect battery cables and tape cable ends to prevent
damage from welding.
Prepare Tractor Frame
Be sure the top surfaces of the tractor frame are clean and rust-free.
Mark the tractor frame directly above the center of the single axles, or above the center of the
tandem axles. Use a center punch to make a mark at D, (Figure 4).
Prepare for Bolt-On installation
As mentioned in the “Installation Introduction” section, you will be bolting steel angles to the
tractor frame and then welding the 5th wheel frame to the steel angles.
The length of the steel angles should extend from about 3 inches in front of the 5th wheel frame
to the very rear of the tractor frame rails. Before installing the steel angles, temporarily place the
5th wheel assembly on the tractor frame to make measurement marks on the tractor frame.
Position 5th Wheel Assembly for FW-30 & FW-45
(see Figures 4a and 5a)
Using an overhead hoist and a suitable safety chain, lift the entire 5
th
wheel assembly and lower it
carefully onto the tractor frame. Position the assembly so the center of the king pin jaws is ahead
of the axle(s) center according to the dimensions indicated for your model on Table 2a.
Proper positioning of the 5
th
wheel assembly on the tractor frame is important because the 5th
wheel plate moves back (away from cab) when rising; the 5
TH
WHEEL JAWS, IN A FULLY
RAISED POSITION, (Figure 5a) MUST NEVER BE BEHIND THE CENTER OF THE
AXLE(S).
It is important that when fully raised, the center of the 5
th
wheel jaws must never be behind the
center of the axles. You must remember that the 5
th
wheel, when down (Figure 4a); will be at
least 6 inches forward of the raised position. You must provide clearance at the back of the tractor
cab for the trailer when it is pulling a trailer having a long king pin setting.
If the 5
th
wheel frame does not fit completely flush on the tractor frame, do not be concerned. You
will fix this in a later step.
