WHEELS, RIMS AND TIRES CAUSE CORRECTION GREASE CAP (Cont’d.) Cracked Housing Grease cap can be damaged by mishandling or improper tightening of cap bolts.  Replace cap if cracked.  Tighten cap bolts alternately in a crisscross pattern to 16-20 N•m (12-15 ft.  lbs.). Sight Glass Cracked or Broken Sight glass can be damaged through abuse in handling cap or object striking it.  Replace bearing cap or window kit. Gasket Leaking at Hub or Wheel Mounting Face Tighten bolts to 16-20 N•m (12-15 ft.  lbs.) alternately in a criss- cross pattern.  Use proper length bolts and lockwashers.  Replace gasket. Sight Glass Gasket Leaking Replace sight glass kit or cap assembly. Rubber Vent Plug Not Seated After filling with lubricant be sure that the rubber vent plug is seated in cap window.  Early Stemco vent plug (with molded part number) are easily misinstalled.  Later type vent plugs without part number do not have this tendency. Threaded Filler Plug Leaking Lubricant Apply thread sealant to threaded plug.  Tighten plug. WHEELS AND BEARINGS Wheel Hub Bore Has Burrs, Rust or Nicks Hub must be smooth and free of excessive rough finish which could scratch outside diameter of seal.  Clean up if possible or replace hub. Hub Bore Diameter Seal should be press fit.  Check for correct application of seal. Porous or Cracked Hub Leakage which would appear at the hub (not at bearing cap or axle flange) is an indication of a possible crack or porous opening allowing lube leakage.  To correct this condition a new hub must be installed. Loose Wheel Bearing Adjustment Loose wheel bearing adjustment will permit side movement of seal and cause abnormal wear or shaft to bore misalignment.  Oil pumping past seal will result.  Set and maintain proper wheel bearing adjustment.  Adjusting wheel bearings too tight can cause early bearing failure. AXLE HOUSING AND SPINDLE Spindle or Axle Housing Has Burrs or Nicks Remove all burrs and nicks.  Correct rough finish.  Do not use chisel to remove wiper ring (wear sleeve). Leakage at Axle Shaft Flange Missing or fractured axle gasket or lack of sealing compound. Replace gasket or apply silastic sealing compound. Cosmolene on Spindle or Axle Housing Thoroughly clean all cosmolene from sealing surfaces and bearing shoulder. Axle Breather Inoperative Excessive lube pressure could cause wheel seal leakage.  Clean or replace breather. CTS-4148A Page 17