21 - 4. FRAME INSPECTION AND REPAIR (Cont' )
Decisions as to whether or not to repair the frame will be made in accordance to the following
Provisions of TB 750-98-23 regarding time and materials versus replacement.
Supply and operational considerations.
Appropriate facilities available.
Personnel skill levels.
Influence of other collateral repairs that may be required to return the vehicle to a
Buckled frame rails with both vertical and horizontal bending are extremely difficult to
repair; recommend item be replaced.
Frame rails that are twisted generally are unrepairable; replace item.
Frame rails that are bent upward, resulting in torn metal in bottom of rail, cannot be
welded only, but also must have a welded-on fishplate repair. If fishplate would block
mounting parts and bolt holes, replace frame rail.
d. Preparation and Materials
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:
Suitable vehicle restraints.
Solid anchors for pulling or seating snatch blocks.
Pulling (pushing) power source, either mechanical or hydraulic.
(b) Frame rail (and possibly one or more crossmembers) replacement requires a quantity of suitable
Patches, dutchman, fishplates, and reinforcements:
Bulk steel plate of grade SAE 950 or equivalent (of equal or greater thickness).
Scrap material of like metal from salvage or cannabilization.
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.
Based on factors of subtasks b and c, prepare a plan to accomplish the task of returning the vehicle
to mission serviceable status.
e. Repair Procedures
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.
The repair or replacement procedure will vary with type(s) and
location(s) of failure(s). For this reason, much of the repair work is
dependent 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, TM 9-2320-280-20, and repair parts manual.