Table A- 4. Truck side frame and bolster gib wear limits

See Figure A-22, Bolster gibs and side frame wear plates.

Figure A-22. Example of a bolster gib and side frame wear plate.

Table A- 4. Truck side frame and bolster gib wear limits.

When wheels are changed or trucks dismantled, wear on truck side frame columns and bolster

gibs must be measured before disassembly and when wear exceeds limits shown below, same must

be repaired.

Repair when total

Repair to these nominal clearance

Type of Truck

clearance between

dimensions between bolster and

bolster and truck side

truck side frame:

frame columns reaches:

Lateral

Longitudinal

Total

Longitudinal

Inside

Outside

Plain bearing trucks WITHOUT

1 1/8"

1/8"

3/16"

built-in features...................

Trucks WITH built-in snubbing

features having plain bearings (all

bearing sizes) or having roller

bearingss which provide bearing

lateral (all bearing sizes) or

having 5"x 9" or 5 " x 10"

roller bearings which provide no

bearing lateral......................

1 1/8"

Trucks WITH built-in snubbing

features having 6" x 11", 6 x

12" or 7" x 12" roller bearings

which provide no bearing lateral

Longitudinal clearances are primarily a matter of wear of frame or bolster column wear plates,

friction shoes and bolster column surfaces. See maintenance instructions from truck designer or

manufacturer.

A - 24