National Crane 600H, Service Manual

Page: 203 / 232

NATIONAL CRANE
08-19-2022 Control # 092-13
9-21
600H SERVICE CRANE INSTALLATION
9
If the frame through the rear suspension does not meet
minimum specifications for RBM and section modulus as
shown on "Truck Frame Strength" table, the frame can be
reinforced by adding an angle type of reinforcing (Figure D).
See "Section Modulus tables, Table B for the required size of
reinforcing.
5. Strip all easily removable equipment from the frame
through the suspension such as spring stops, etc. Butt
the reinforcing angle up against the reinforcing forward
of the suspension and mark the areas that will require
cutting so that the angle will slide up around the spring
hangers and against the existing truck frame and
forward reinforcing. Torch out the marked areas in the
long leg of the angle deep enough so that the lip of the
angle can be slid up from the underneath the frame to
contact either existing truck frame or spring hanger
brackets (if they extend down below the existing truck
frame). If reinforcing angle is to be welded to truck
Crossmember bolt holes.
Plug we holes can be
shifted slightly to clear.
4 (101)
4 (101)
8 (203)
2 (51)
5 (127)
2 (51)
1 (25.4) diameter
holes for plug welds
Planned location of mounting
plate. Plug weld locations can
be shifted to clear plate.
Clearance holes for rivets on weld or
on reinforcement. Can be filet welded
around to eliminate plug weld holes.
8 (203) Typ
4 (101)
2 (51) Min
2 (51) Min
NOTE: All dimensions are in (mm)
8 (203) Typ
Figure C
Figure B
REFERENCE ONLY