WHEEL BEARING SEAL AND BEARING CAP DIAGNOSTIC CHART

WHEEL BEARING SEAL AND BEARING CAP DIAGNOSTIC CHART - cont

TM-5-3820-256-24-5 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
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WHEELS, RIMS AND TIRES WHEEL BEARING SEAL AND BEARING CAP DIAGNOSTIC CHART Prior to replacing a leaking wheel seal or front wheel hub cap, the actual cause of the leakage should be diagnosed to insure that the leakage problem will not reoccur. You will note that the chart has four categories where the leakage could occur; do not overlook all four situations. Possible contributory causes of apparent wheel seal leakage are: CAUSE CORRECTION WHEEL SEAL Seal Cocked or Not Properly Seated in Hub Be sure to confirm uniform seating of seal after installation. Use proper installation procedures. Seal Lip Cut or Rough on Open Lip Type Seals. Inside and Outside Diameter Damaged on Unitized Seals New seal could have been damaged prior to installation. Inspect lips of new seals before and after installation in hub. Seal can also be damaged due to abuse during installation of hub assembly by contact with spindle or axle end or threads. Worn or Damaged Wiper Ring and Seal Normal wear of seal lip to wiper ring contact area or improper installation of wiper ring. Replace seal and wiper ring using correct installation tools. Seal Loose or Too Tight in Hub Bore or Seal Lip Over Size Check for correct application of seal assembly. Sealant Not Applied to Seal Outside Diameter When Required Use Loctite Gasket Eliminator when instructed to do so. Grease On Inside or Outside Diameter of Mechanix Barrier Seal Grease may cause seal to move in hub bore or at axle housing or spindle. Seal is designed to grip hub bore and axle housing or spindle. Remove grease from inside and outside diameter. Brake Cam Shaft Seal Leakage Excessive lubrication of brake cam shaft can cause grease to enter brake groups and may be mistaken for faulty wheel seal. Do not overlubricate brake cam shafts. GREASE CAP Lubricant on Exterior of Grease or Hub Cap Lubricant spillage either at initial fill or lube added. Steam clean lubricant from grease cap so that it is not mistaken as a faulty sight glass, bearing cap or gasket. Over Fill of Lubricant Excessive lubricant can cause lube to be expelled from grease cap plug. Maintain proper fill level mark on window. CTS-4148A Page 16

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