TM-9-3990-260-14-P
CONTAINER ROLL-IN/OUT PLATFORM (CROP) MODEL M3 AND MODEL M3A1
TECHNICAL MANUAL; OPERATOR’S, UNIT, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL (INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST)
JULY 2001
TM-9-3990-260-14-P - Page 125 of 306
TM 9-3990-260-14&P
Change 1
5-7
(3)
End Structure Assembly.
Solid welds and parent material in this area are essential to ensure
safe loading and unloading of the CROP. These welds connect the bail bar assembly to the
end structure assembly tubes and the end structure assembly tubes and support beam to the
pin support plates. Cracks in the parent material of the bail bar assembly or pin support
plates are not reparable and require replacement of the end structure assembly. Testing of
weld cracks should be conducted to ensure no crack has propagated into the parent mate-
rial. Cracks in welds that have not propagated into the parent material should be repaired
immediately.
(4)
Bail Bar.
These welds will be applied to the middle of the bail bar where contact with the
PLS hook has worn the bail bar more than is allowed (see Table 4-1, item 2).
(5)
Twistlocks.
(6)
Cross Beams.
These welds are located where each lateral beam is connected to a main
beam and/or side beam.
(7)
Main Beams.
The main beams provide the major portion of the load carrying capacity of
the CROP. They provide almost 100% of the load while loaded on the truck and trailer or
resting on the ground.
(8)
Stowage Boxes.
The only welds are those connecting the recessed latch assembly box to
the underside of the lid. These welds should be repaired when necessary to prevent the
latch assembly box from detaching from the door.
(9)
A-Frame.
Solid welds in the A-frame area are necessary to ensure safe loading and unload-
ing of the CROP.
(10)
Hookbar.
These welds are located at the base of the hookbar casting on the A-frame of the
M3 CROP. These welds secure the hookbar to the A-frame and are subjected to a signifi-
cant portion of the total load during loading and unloading operations.
(11)
MIL-STD-209 Multipurpose Rings.
The large D-rings of the CROP are used for transpor-
tation. They may be used to secure the CROP to a trailer or railcar.
(12)
Decking.
b.
Removing the CARC Paint Primer and Galvanizing Coatings Prior to Weld
Repair.
NOTE
There are three options to repair a weld: 1) oxyacetylene torch; 2) sandblasting, or; 3) surface
grinding. Use one of these options to remove CARC paint, primer and galvanizing prior to
weld repair.
Use a respirator when removing paint, primer and galvanizing with an oxyacetylene torch be-
cause of the toxic gases.
NOTE
The galvanizing must be heated to 860°F (460°C) before it will melt.
(1)
Option One.
Use an oxyacetylene torch and a stainless steel wire brush to remove the
paint, primer and galvanizing.
(a)
Using oxyacetylene torch, heat galvanizing to 860°F (460°C).
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