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 525 of 640

0090-3

TM 9-2330-335-14&P

0090

KINGPIN WELD REPAIRS PROHIBITED

00090

WARNING

When welding, use a procedure which assures a sound, good quality weld which protects the

welding operator and others. Overwelding may cause distortion and damage and underwelding

may not develop sufficient strength. A low hydrogen process and AWS 370XX filler metal are

recommended. Take precautions to ensure that the vehicle electrical system is not damaged by

the welding.

Kingpins are made from quenched and tempered alloy steel. Weld repairs of any type will affect the strength and wear

resistance of the kingpin. Additionally, arc strikes or weld craters could develop a stress riser, leading to a fatigue failure. For

these reasons, Holland warns against any weld repairs. If any deficiencies are noted during kingpin inspection, the kingpin

should be replaced (see Figure 4).

Figure 4.

Deficiencies.

090

447-0092