Windsor-Severence Fire Protection District
Heavy Rescue
Production Specification
SVI #774 Page 40 of 126 April 19, 2010
FRAME
The frame shall consist of double channel side rails and cross members forming a ladder style frame. The sides of the
rails shall be formed in the shape of a "C" channel, 10.25 inches high X 3.50 inches deep upper and lower flanges X .38
inches thick with an inner channel of 9.44 inches high X 3.13 inches deep and .38 inches thick. The high strength low
alloy steel shall have a Tensile Elastic Limit of 110,000 psi. Each double rail shall be rated by a Resistance Bending
Moment (RBM) minimum of 3,213,100 inch pounds and have a minimum section modulus of 29.21 cubic inches. The
frame shall measure 35.00 inches in width.
Proposals calculating the frame strength using the “box method” shall not be considered.
Proposals including heat treated rails shall not be considered. Heat treating frame rails produces rails that are not uniform
in their mechanical properties throughout the length of the rail. Rails made of high strength, low alloy steel are already at
the required yield strength prior to forming the rail.
A minimum of seven (7) fully gusseted 0.25 inch thick cross members shall be installed. The inclusion of the body
mounting, or bumper mounting shall not be considered as a cross member. The cross members shall be attached using
zinc coated grade 8 fasteners. The head bolts shall be flanged type with distorted threads, held in place by flanged lock
nuts. Each cross member shall be mounted to the frame rails utilizing a minimum of 0.25 inch thick gusset reinforcement
plates at all corners balancing the area of force throughout the entire frame.
.
Any proposals not including additional reinforcement for each cross member shall not be considered.
Frame rails will be manufactured such that bolt attachment holes are specific for each component and shall not include
any unnecessary holes.
All relief areas shall be cut in with a minimum 2.00 inch radius at intersection points with the edges ground to a smooth
finish to prevent a stress concentration point.
The frame and cross members shall carry a lifetime warranty to the original purchaser. A copy of the frame warranty shall
be made available upon request.
Proposals offering warranties for frames not including cross members shall not be considered.
FRAME WARRANTY
The frame and cross members shall carry a limited lifetime warranty to the original purchaser. The warranty shall include
conditional items listed in the detailed warranty document which shall be provided upon request.
FRAME CLEAR AREA
The chassis frame shall be left clear of chassis mounted components inside or outside the frame rails within the first 30.00
inches behind the cab to allow space for OEM installed components. Cross members may be installed in the clear area if
required for proper frame or driveline configuration.
(112 paginas)
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