TM-5-3805-254-14-P-2
TRUCK, DUMP, 20 TON, 6X4, ON-OFF HIGHWAY 71,000 GVW, IHC MODEL F-5070 (CCE)
TECHNICAL MANUAL; OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT, GENERAL SUPPORT AND DEPT MAINTENANCE MANUAL (INCLUDING REPAIR PARTS INFORMATION AND SUPPLEMENTAL MAINTENANCE INSTRUCTIONS)
JUNE 1980
TM-5-3805-254-14-P-2 - Page 110 of 894
MOTOR TRUCK SERVICE MANUAL
BODIES AND CABS
making a short run of weld at one end of the crack,
starting at the drilled hole.
This weld should be about
one inch (1") long. The purpose of this short weld is to
prevent the forming of a crater in the metal surface when
the welding is completed (Fig. 6).
Fig. 6.
Showing method of applying short run of weld.
6.
Having completed the short weld, working at the
opposite end of the crack start the final weld run at
the drilled hole and carry this weld run up onto the
short run section previously applied.
Stop the final
weld midway on the short run section.
This
procedure will prevent the leaving of a crater in the
metal surface as indicated above.
A crater in the
skin surface could cause cracking.
Tilt the torch or
welding gun away from the direction of travel as
shown in Fig. 7.
If the crack repair is not exposed
and is not to be painted, no further work is required.
Fig. 7.
Direction of weld and tilting torch.
Where the weld is to be finished and painted,
proceed as follows:
Finishing Weld Repairs
To minimize working of the sheet metal surfaces,
avoiding grinding and other metal work, the repaired
crack or section of the cab or panel skin can be finished
as follows:
1.
Using a suitable driving tool, work the weld down
below the surface of the surrounding area, Fig. 8.
The weld should be depressed or recessed only
enough so that it can be
covered with plastic or fiber glass material.
2.
Thoroughly clean the welded area using a stainless
steel brush.
3.
Proceed with the repair as outlined under "Plastic
Putty Repair", or, if necessary, use the procedure
covered under "Fiber Glass Repair".
Fig. 8.
Application of Plastic Putty
NOTE
:
When drilling in aluminum, use sharp drills in
good condition.
Avoid the use of files.
FIBER GLASS AND PLASTIC PUTTY REPAIRS
The use of plastic putty or fiber glass repairs on
aluminum cab surfaces can be considered when the
repair is made to surfaces that are not under strain.
Generally, these are the flat surfaces of cab sections.
Also, small holes in the cab skin (under 1/4" in diameter)
may be filled with plastic putty or fiber glass materials.
(Fig. 9).
The use of plastic putty and fiber glass will
minimize sheet metal work on the aluminum surfaces
and reduce the possibility of further unsightly damage.
Fig. 9.
Repair of small hole in aluminum sheet
In all aluminum cab surface repairs, the use of
emery wheels to smooth surfaces should be kept to
a minimum to prevent grinding the material to the
extent that the skin is thinned
108
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