9
5) Underride Assembly
With the truck at its actual driving weight, parked on a
level surface, measure the distance from the ground to
the bottom of the truck frame. A distance of 711±25 mm
[28±1"] is required. Spacers may be added to the bot-
tom of the frame to achieve this height (see figure 13
and the Underride Assembly drawing on page 47).
Note: The truck’s springs may settle with the
weight of the TMA, sometimes, as much as 50 mm
[2"]. Adjust the height to compensate for antici-
pated settling.
Measure from the back end of the frame forward to the
rear-most leaf spring hanger, or any other obstruction
on the bottom of the frame that may interfere with the
socket receiver. A minimum of 305 mm [12"] is required
(see the Underride Assembly drawing on page 47).
Position the socket receiver at the rear end of the frame so
that the 76 x 387 mm [3 x 15 1/4"] flat bar is along the
outside of the frame member and the socket receiver tube
is flush with the end of frame. If spacers are required,
weld them to the receiver tube and lap the spacer splices
(pieces of 10 x 51 x 103 mm [3/8 x 2 x 4"] flat bar) across
the socket receiver tube and spacer at the rear-most loca-
tion (see underride assembly drawing). The top of the
socket receiver tubes must be 711 ± 25 mm [28 ± 1"] from
the level ground for proper system height (see Figure 12).
Weld the socket receiver tube to the bottom of the truck
frame with the 76 x 387 mm [3 x 15 1/4"] flat bar on the
outer side of the frame (see Figure 11).
Note: All welding must be performed by a welder
certified to AWS D14.3-82 or AWS D1.1 in accor-
dance with the underride drawing.
CAUTION: The truck frame is high carbon steel.
To avoid cracking, do not weld, or apply ex-
cessive heat, to the bottom flange, forward of
rear-most leaf spring hangers.
Prime and paint all welded areas.
STEPS
4 & 5
STEP
6
STEP
7
ATTACHMENT
ASSEMBLY
SUPPORT
FRAME
STEP
12
STEP
11
STEPS
8 & 9
UNDERRIDE
SOCKET
RECEIVER
SUPPORT
MOUNT
Figure 10
TRUCK FRAME
FLAT BAR
UNDERRIDE
SOCKET
RECEIVER
Figure 11
Figure 12
864 mm [34"] NOMINAL
710 mm
[28"]
NOMINAL
TRUCK
FRAME
FLAT BAR
UNDERRIDE
SOCKET RECEIVER
STEP
10
Summary of Contents for Safe-Stop 180 TMA 9181
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