Defect. Cracks and Elongated Or Gouged Mounting Holes

TB 9-2300-247-40

b. Bevel edges of crack and weld to obtain

d. Weld additional plates on each end of

complete penetration.

crossmember as described in paragraph 6.

Plates shall be welded in area of highest density;

approximately 6 inches measured in from each

WARNING

end.

Use only effective chip guarding

e. Stress relieve all welded areas for one hour by

equipment, protective equipment and

heat treating at 11250 F., plus or minus 25 F.

protective clothing (goggles, shields,

gloves aprons, etc) when doing any

Thoroughly clean repaired

surfaces

and

drilling, grinding, or welding. Failure

surrounding area of repair.

to follow this warning could result in

injury to personnel.

g. Prime and paint repair area and surrounding

surfaces as specified in TM-43-0139.

Grind away excess metal of weld bead to

eliminate bead acting as stress raiser.

Figure 39. (Added) Repair of Cracked Frame Rails

Bevel edges of V-shaped groove.

54.

Defect. Cracks and Elongated Or Gouged

Mounting Holes. Figure 40 illustrates cracks and

CAUTION

elongated or gouged mounting holes detected forward of

No. 1 crossmember or to rear of bogie.

No weaving motion will be used

WARNING

during the welding process. Heat

and number of welding passes will be

Use Only effective chip guarding

kept to a minimum to prevent

equipment, protective equipment and

excessive heating of side rails

protective clothing (goggles, shields,

d. Obtain electrode type, MIL-308-MO-16, Class,

gloves aprons, etc when doing any

sized 1/8-inch or 3/32-inch, with maximum for

drilling, grinding, or welding. Failure

the welding process.

to follow this warning could result in

injury to personnel.

e. Using copper back-up, apply welded stringer

bead to each side of groove.

a. Drill a 2/16-inch diameter hole at the terminal

point of the crack.

Apply channel flaseplating reinforcement plates

after welding as described in paragraph.

b. Grind a V-shaped groove along the edges of the

Thickness of flaseplating reinforcement shall be

crack, through the thickness of the cracked

equal to side rail thickness within 5/16-inch.

section.

Bolting instructions shall be as described in

paragraph.