compressed while the bearing is being packed. Saturate all the packing to be used with warm oil for 24
hours and allow it to drain for 12 hours at a temperature of approximately 85 F. so that the oil will not
congeal. Fill the bearing with lubricating oil; then open the oil well cover and gage the depth of the oil.
If the bearing is not sufficiently full, pour oil into the auxiliary oil well until the proper depth of oil is
reached: 3 1/2 inch maximum measured on slant.
d. Journal bearings. All parts of the journal box are interchangeable when new. After the parts
in the assembly operate together for a long time, each part wears to fit adjoining parts. For example, if
during manufacture a slight irregularity were left on one part, the adjoining part would, after a while,
wear to conform to the shape of the irregularity. For this reason, a journal box and bearing should be
treated as a unit and used only on the journal to which it belongs. The bearings are usually made of an
alloy of tin and copper called babbit metal.
A journal bearing and thrust bearing can be removed in the following manner: remove the
waste from the journal box and jack the box high enough that the locomotive's weight is not resting on
the journal bearing; remove spring caps, gaskets, lateral springs, and wedge from top of journal bearing--
hold the thrust bearing so that it will not fall while the springs are being removed; insert bolt in the hole
in the front side of the bearing and pull out. If the waste is dirty, replace it with a clean oil-soaked waste
Correct tension should be maintained on a V-belt. If a belt is too loose, it will slip and cause
both the sheave and the belt to wear and the engine to overheat; if it is too tight, bearings are subjected to
overload and will wear rapidly. Belt tension may be checked by depressing the V-belt in the center. The
amount of deflection will vary somewhat due to the variation in drive center distances, but usually the
proper deflection will run from 1/2 to 1 inch. The pressure exerted at the center of the belt to check this
deflection should be the normal pressure you can exert with one finger without straining.
Whenever a set of belts is being applied, the center distance of the drive must be reduced so that
the belts can be placed over the sheaves freely. If this were not done, it would be necessary to force the
belts into the sheave grooves, causing ply breakage and cover damage and resulting in shortened service
life for the belts. Check