tion. They will show up in the steel frame members
as weld cracks, cracked and loosened steel sections.
12-2. An important phase of trailer upkeep and
12-5. WELD REPAIRS.
maintenance is the inspection and repair, if any, of
all structural steel members of the trailer frame. It
is readily apparent that the frame must be one solid
unit to carry the load safely and quickly without
12-7. Minor repairs to a crossmembers, floorplates,
danger of accident or further damage to the trailer.
and other parts which are not part of a main struc-
This also prevents subsequent major repair costs
tural member may be repaired without special in-
and trailer downtime.
struction if good welding practices are followed.
Repairs to major structural members should be made
12-3. The need for a complete frame inspection
with an expert eye to the requirements of the part
stems from various reasons. Due to the heavy loads
being repaired. Care should be taken to ensure that
and difficult road conditions under which they are
the repairs do not contain stress risers; areas which
often operated, trailers are subject to considerable
contain character sties that could lead to another
abuse. A trailer loaded to maximum rated capacity,
or greater, and pulled at sustained speeds greater
than accepted design standards, will depreciate at
an accelerated rate. This rough handling may also
cause structural failures of varying, degrees.
12-8. Table 12-1 lists the recommended electrodes
12-4. Failures are the result of metal fatigue due
for the various steel used in HYSTER trailers.
to flexing, bending, twisting, vibration and distor-
FIGURE 12-1. DUTCHMAN PLATE INSTALLATION.