TB 9-2320-335-13&P
32-4. FRAME INSPECTION AND REPAIR (Cont'd)
d. Preparation and Materials
1.
To perform a repair on the frame, a plan is needed due to the large variability of steps and methods
to be employed. This plan is influenced by:
(a) Bending-type repair:
(1) Suitable vehicle restraints.
(2) Solid anchors for pulling or seating snatch blocks.
(3) Pulling (pushing) power source, either mechanical or hydraulic.
(b) Frame rail (and possibly one or more crossmembers) replacement requires a quantity of
suitable blocking material.
(c) Patches, dutchman, fishplates, and reinforcements:
(1) Bulk steel plate of grade SAE 950 or equivalent (of equal or greater thickness).
(2) Scrap material of like metal from salvage or cannabilization.
(3) Heli-arc welding rods of type AWS A5.20 (E 707-1) or equivalent.
(d) In critical situations, 1/4-in. (6-mm) construction grade steel angle or plate may be used.
2.
Based on factors of subtasks b and c, prepare a plan to return the vehicle to mission-serviceable
status.
e. Repair Procedures
CAUTION
Bulk heating of frame rails to remove bends and buckles is not an
approved procedure. The strength characteristics of the metal are
affected. The repair may fail, causing damage to equipment.
NOTE
The repair or replacement procedure will vary with type(s) and
location(s) of failure(s). For this reason, much of the repair work
depends on skill of the mechanics, supply status, and operational
situation. The removal/replacement of parts, bolts, and brackets
affecting the repair are left to the discretion of the mechanics and
will be governed by the instructions in this manual and repair
parts manual.
1.
Transverse tears, cracks, and breaks repairs (all welding on frame) will use reinforcements
(dutchman/fishplate), and be heli-arc type as given in TC 9-237, providing tears, cracks, or breaks
are repairable (refer to task c.).
(a) Stop-drill crack with 1/8-in. (3-mm) drill hole.
(b) Vee-notch crack.
(c) Heli-arc weld crack with approved welding rod.
(d) Grind-weld flush to the surface of the rail.
(e) Install reinforcement (dutchman/fishplate) and lap-weld.
2.
Welded reinforcements or fishplates will not be less than 6 in. (15.2 cm) in length along frame rail.
3.
All puncture holes may be repaired as follows:
(a) Heli-arc weld fill holes.
(b) Grind-weld flush to surface.
(c) Install reinforcement (dutchman/fishplate) and lap-weld.
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