TM9-2330-372-14&P
c. Inspect bearing cups for damage. Wear is indicated by dull, frosty appearance of surface, and/or pitting.
Replace defective cups. Check that cups are not loose in the hub.
NOTE
If either the cup or cone need replacing, both must be replaced.
NOTE
Bearings must be clean. Do not allow a bearing to contact dirty hands or surfaces.
d. Repack the bearings with grease (App. E, item 3).
e. Apply a thick coat of grease in the hub between the cups.
f. Reinstall bearings, hubs, drums and wheels, and adjust wheel bearings (para. 4-21).
4-21. WHEEL BEARING ADJUSTMENT. When installing inner spindle nut (8, fig. 13), set bearing pre-load by fully
tightening the spindle nut while rotating the hub in both directions until hub will not move with hand pressure. Then back
off spindle nut (one quarter turn) and install lock washer (13) and outer spindle nut (8). Bend down tab of lock washer
over outer spindle nut.
NOTE
Spindle nut socket wrench is stored in trailer tool box.
4-22. REPAIR INTERVEHICULAR AIR HOSE AND COUPLER (Fig. 9).
NOTE
Remove and replace any air lines having evidence of leakage by disconnecting connectors.
Remove clamps as required and pull lines through grommets.
NOTE
Wrap all couplings with teflon tape during installation.
a. Pry packing ring (12, fig. 9) out of coupler (9) with a small screwdriver and discard the ring.
b. Clean dust, dirt or corrosion from coupler recess.
c. Install new packing ring.
d. Charge air system and listen and feel for air leaks in hoses, fittings, filters, relay valve and air chambers. Soap
and water solution can also be used to check for leaks.
4-19
