National Crane 1-21-2019 Control # 104-07 9-7
1400A SERVICE MANUAL CRANE INSTALLATION
The following tables determine the section modulus of the
truck frame. Measure the truck frame and check the tables to
be sure that the truck factory listed section modulus is
correct.
•Channel (Table A page 9-8) - Table A provides the
section modulus of channel frames in thicknesses
of4.76 mm (3/16 in), 6.35 mm (1/4 in), 7.94 mm (5/16),
and 9.52 mm (3/8 in) with each grouping a flange width
and web depth column. When the depth of frame
channel and flange width is known, the point at which
these two lines intersect is the section modulus from that
particular channel.
If the section modulus of the channel does not meet the
requirements, the channel should be reinforced in the
most applicable method following.
• Channel Reinforcement (Table A page 9-8) - In order
to provide more strength, a channel of suitable thickness
can be added to the existing frame. The depth and
flange width of this channel should be chosen so it fits
over the existing frame. The section modulus of the
needed channel is obtained from Table A and should be
added to the section modulus obtained from the truck
frame. Add this to the section modulus of the channel
obtained from Table A.
• Angle Reinforcement (Table B page 9-9) - If the truck is
reinforced with an angle, refer to Table B for the data on
the added strength provided by the angle. Add this to the
section modulus of the channel obtained from Table A.
• Fish Plate Reinforcement (Table C page 9-9) - The
frame can be strengthened by adding a fish plate of
suitable thickness and depth equal to the frame. The
section modulus of the fish plate can be obtained from
Table C and this must be added to the section modulus
of the frame to obtain the total section modulus.
• Angle Under Reinforcement (Table D page 9-9) - This
table lists the section modulus of an angle with the
flange under the truck frame that is added to a frame
with an angle reinforcement already added. Add the
section modulus from Table D to the section modulus
obtained from tables A and B to determine total section
modulus.
The edges of the reinforcing angles or channels are to
be flush with the edges of the frame.
Welding - Two rows of 25.4 mm (1 in) diameter plug welds
are to be placed in a staggered pattern of the web; the rows
to be spaced 127 mm (5) apart with welds at an interval of
102 mm (4). Do not weld on the flanges.
Where thickness, depth or flange width vary, interpolation
between tables or variables within a given table will provide
the strength for the section.
If you have any questions concerning frame strength or
reinforcing, contact National Crane before proceeding.
120
(304)
108
(274)
96
(243)
84
(213)
72
(182)
60
(152)
48
(121)
36
(91)
24
(61)
12
(30)
0
(0)
FIGURE 9-5
NOTE: All dimensions are inches (centimeters)
Distance From SFO Attachment
Inches (centimeters)
Fo
r
Reference
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