PS Magazine - TB 43-PS-732
PS, The Preventative Maintenance Monthly
ISSUE 732
NOVEMBER 2013
14
PS 732
NOV 13
Add to Annual PMCS
TACOM LCMC plans to update TM 9-2330-329-14&P, TM 9-2330-330-14&P,
TM 9-2330-356-14&P, and TM 9-2330-398-24&P in FY14. The TM changes will
include requirements to:
• perform an annual PMCS at the field maintenance level for each coupler plate check
identified.
• annually inspect the coupler plate area for corrosion.
• disassemble and clean the potential corrosion problem areas as required.
Tanker Frame Inspection
You’ll need to inspect your fuel tanker’s frame rails and high structural stress areas,
too. Take a good look at the frame area under the upper coupler. Clean the corroded
areas and then measure them with the caliper. The material must be .213 inches or
more for the frame rails and structural components to be usable. See this table for
more info:
Tanker
frame
Tanker cross
members
.250
.225
.213
.125
.375
.250
.225
.213
.125
.375
Component
Original
thickness
(inches)
10 percent
loss
(inches)
15 percent
loss
(inches)
50 percent
loss
(inches)
150 percent
repaired thickness
(inches)
You’ll ±nd high structural stress areas at structural stiffeners, where cross
members connect with frame rails, and where bottom ²anges meet with the beam
web and weld joints. Even if you see only a little corrosion, you should still measure
these areas.
Determine the cross-sectional thickness of the corroded area using the vernier
caliper. When the overall material thickness is .213 inches or more on the frame rails
and structural components, remove all corrosion and any old paint. Then treat and
repaint using TB 43-0242 for guidance.
If the thickness of the frame rails and structural components is less than .213
inches, the tanker is non-mission capable until repairs are made.
Areas that measure between .125 and .212 inches on the frame rails and
structural components should be reinforced to .375 inches. The rebuild will require
heavier sectional members, including backing plates. Refer to Para 5-5, Repairing
Deterioration Caused by Corrosion, in TB 9-2510-242-40. Section IV of the TB
gives you info on the equipment and skills necessary to repair the tankers.
If the frame rails and structural components have a thickness of less than .125
inches, the entire structural section, including the frame rails, cross members and
structural stiffeners, must be replaced.
When you order kingpin couplers again, they will already have drain holes. So
all you’ll have to do is install them.
be sure to
inspect
all
high
structural
stress areas!
Structural stiffeners
Welds
Coupler meets frame
1“
1“
For all other models,
drill four
5
/
8
-in
drainage holes
3
1
/
2
“
3
1
/
2
“
732 14-15.indd
1-2
10/2/13
12:54 PM
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