Manitowoc National Crane 500E2 Service Manual

National Crane Published 08/16/19 Control # 112-05 9-9
500E2 SERVICE MANUAL CRANE INSTALLATION
9
SECTION MODULUS TABLES
The following tables will determine the section modulus of
the truck frame. Always measure the truck frame and check
the tables to be sure that any truck factory listed section
modulus is correct.
Channel (Table A)
Table A provides the section modulus of channel frames in
thicknesses of 3/16 inch (4.76 mm), 1/4 inch (6.35 mm), 5/16
inch (7.94 mm), and 3/8 inch (9.52 mm) 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)
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.
Angle Reinforcement (Table B)
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)
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)
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 1 inch (25.4 mm) diameter plug welds
are to be placed in a staggered pattern of the web; the rows
to be spaced 5 inches (127 mm) apart with welds at an
interval of 4 inches (102 mm). 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.

Manitowoc National Crane 500E2 Specifications

General

Brand	Manitowoc
Model	National Crane 500E2
Category	Construction Equipment
Language	English