Warren Elevating 5
th
Wheel
7
Pre-Installation Instructions
Important: Before starting the installation carefully complete all the pre-installation installation
steps.
Check Tractor C.A.
Refer to the Table 1 to ensure you will be operating the elevating 5
th
wheel within its operating
parameters.
C.A. refers to the distance from the last above-frame obstruction (i.e. transmission mount,
muffler, etc.) behind tractor cab to center of single or tandem axles. This area must be kept clear
for mounting the 5
th
wheel assembly. If there is no above frame obstruction, the CA. is the
distance from the back of the cab to the center of the single or tandem axles.
Make sure the tractor you are planning to use has the proper C.A. and gross weight capacity to
match the lifting 5
th
wheel model you have received.
Table 1: 5
th
Wheel C.A.
1
Requirements and Gross Weight
2
Capacity
5th Wheel
Model
Minimum Recommended Tractor
C.A. Dimension Trailer King Pin
Setting
3
Ins., (mm.)
36(914) 42(1067)
Gross Weight
Capacity
Lbs. (Kg.)
2
FW-30
72 inch (1829 mm ) 78 inch (1982 mm)
60,000 (27,218)
FW-45
72 inch (1829 mm ) 78 inch (1982 mm)
90,000 (40,909)
FW-25HL6
84 inch (2134 mm ) 90 inch (2286 mm)
50,000 (22680)
Footnotes
1. CA. refers to the distance tram last above-frame obstruction (i.e. transmission mount,
muffler, etc.) behind tractor cab to center of single or tandem axles. Most trailers have a 36
in. or 42 in. king pin setting. Add dimension for refrigeration unit.
2. Gross Weight Capacity refers to total weight — trailer and contents.
3. Trailer King Pin Setting. This is the distance from trailer king pin to trailer front (including
refrigeration unit). This and tractor C.A. determines whether there is adequate clearance from
the back of the cab to the front of the trailer. As with any 5th wheel, adequate space is
necessary for clearing trailer corners when turning.
Most standard trailers have 36 or 42 inch king pin setting. Your trailers may differ. Be sure to
add extra clearance for refrigeration unit or other equipment which may extend beyond trailer
front.
Check for Power Take Off Capability and Location
The installation of a Warren 5
th
wheel requires the addition of a PTO to the tractor.
Check the tractor transmission to see which opening you will use for the PTO. Most
transmissions have two PTO openings. Order the PTO based on which opening has easier access.
Check to make sure that your tractor has a PTO drive gear installed. Some Mack
©
transmissions
do not have a PTO drive gear installed. It can be installed by a truck transmission shop or Mack
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