TM-9-2330-335-14-P
SEMITRAILER, TACTICAL, BREAKBULK/CONTAINER TRANSPORTER, 22-1/2 TON, RESET M871R, M871A1R AND M871A2R
TECHNICAL MANUAL; FIELD AND SUSTAINMENT MAINTENANCE MANUAL (INCLUDES REPAIR PARTS AND SPECIAL TOOLS LIST)
SEPTEMBER 2008
TM-9-2330-335-14-P - Page 523 of 640
TM 9-2330-335-14&P
0090-1
0090
FIELD AND SUSTAINMENT MAINTENANCE
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KINGPIN MAINTENANCE AND REPLACEMENT RECOMMENDATIONS
KINGPIN MAINTENANCE
00090
Inspection and maintenance of the trailer upper coupler and kingpin is just as important as the inspection and
maintenance of its mating component, the fifth wheel. The following procedures are based upon recommendations
outlined in SAE J2228. They should be completed every 3 months, or 30,000 miles, to ensure proper and safe
kingpin/fifth wheel coupling.
1.
Upper Coupler Plate Flatness.
Using a 48 in. (122 cm) straightedge, check the flatness in all directions. Any
bumps, valleys or warping will cause uneven loading of the fifth wheel, which could result in damage to the top
plate and poor lock life. Replace the trailer upper coupler plate if flatness exceeds the specifications shown in
Figure 1.
2.
Inspect the Kingpin for Straightness.
Using a square or Holland Kingpin Gage (TF-0110), check to see if the kingpin is
bent. A bent kingpin accelerates lock wear and may interfere with proper fifth wheel locking. This also may indicate
damage. The kingpin should be replaced if it exceeds 1 degree from square in any direction (see Figure 1).
Figure 1.
Straightness.
090
447-0089
4
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