Section II: Installation - Accessories
INSTALLATION INSTRUCTIONS – DROP DOWN BUMPER ASSEMBLY
1. Review all directions and diagrams provided before starting bumper installation. Typically, a
drop down bumper is needed when the rear of the container extends beyond the back of the
truck such that the distance between the truck bumper and container rear exceeds 24” (see
Fig. A). Office of Motor Carrier
Safety (OMCS) Regulation 393.86
requires that no bumper be located
more than 30” off the ground when
the truck is empty, and the end of
the bumper should not be located
more than 24” from the extreme
rear of the vehicle, including truck
bodies (see Fig. A).
2. Position drop down bumper on the
longsills of the sub-frame (see Fig.
B & C). The mount brackets [Pt.
No. 51H17] need to be positioned
correctly to allow for sufficient
room for bumper cradles [Pt. No.
51H19] (see Fig. B). Weld mount
brackets onto the longsills of the
sub-frame.
3. Position bumper cradles [Pt. No.
51H19] on the longsills of the
sub-frame. Check bumper cradles
for squareness with respect to
each other. The bumper tube [Pt.
No. 51H16] should come to rest
within the bumper cradles when
the container rests on the ground
(see Fig. B & C). Weld bumper
cradles into place on longsills.
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