(3)  
0231 Methyl or Isopropyl Alcohol - TT-1-735 (Ref 20-30-31)

 (4)  
G00034 Cheesecloth

 (5)  
Brushes

 (6)  
B00183 Trichloroethylene Solvent - BMS 11-6, types I and II

 (7)  
G00270 Masking tape

 (8)
B00168 Wet and Dry Abrasive Paper - Number 400 or finerReferences

 (1)
32-45-11/401, Main Gear Wheel Well and Tire - Removal/InstallationAmmonium Persulphate Solution Procedure

 S 122-041
 WARNING: DO NOT BREATHE THE VAPORS OF THE SOLVENTS OR ETCH SOLUTIONS.
_______ DO NOT GET THEM IN YOUR EYES, ON YOUR SKIN OR ON YOUR CLOTHES. INJURY TO PERSONS MAY OCCUR.
 (1)  
Strip the cadmium surface with sandpaper applied by hand. Strip a minimum area of 0.5 inch through the area that is not to be tested.

 (a)  Strip a minimum area of 0.5 inch larger than the area that is to be tested.

 (2)  
Clean the area to be etched, with solvent.

 S 282-034

 (3)  
Apply the ammonium persulphate solution, with a cheesecloth, on the surface to be tested for 30 to 60 seconds.

 S 112-033
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 162-035
 WARNING: DO NOT LET THE ETCHANT SOLUTION TOUCH THE CADMIUM PLATED
_______ SURFACES. POISONOUS FUMES CAN OCCUR AND CAUSE INJURY TO PERSONS.
 (4)  
Rinse the surface with hot or cold water immediately. Alcohol can also be used.

 S 162-036

 (5)  
Dry the surface with clean, dry compressed air immediately.

 E. Examine etched area.
 S 212-037
 (1)  Examine the parts with a bright light and without magnification. Look for signs of burning.
 (a)  
If all of the etched area is the same shade of gray, there will be no change to the temper of the steel.

 (b)  
The area that has been too hot will be light in color. Look for the light color in the center of a darker area.

 (c)  
If the etched area is mottled, the condition of the heat treat is not sure. Replace the axle or do a high quality metallurgical test.

 F. Put the airplane back to its usual condition.
 S 122-038
 (1)  Remove the etch with abrasive paper.
 NOTE:____Do this step if the part is serviceable. If it is not serviceable, install replacement parts.
 S 372-039
 (2)  
Refinish the surface with the correct primer and paint.

 (3)  
Install replacement tires and wheels (Ref 32-45-11/401).

 S 422-040
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 01 Page 209 ú Mar 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 WHEEL BEARING FAILURE/DAMAGE CONDITION - MAINTENANCE PRACTICES
______________________________________________________________ (CONDITIONAL INSPECTION)
________________________
 1.  General_______
 A. This section gives an inspection procedure for landing gear wheels, brakes, axle sleeves, and axles after a wheel bearing failure.
 B.  The degradation of wheel bearing components can occur as follows:
 (1)  
Lubrication that is incorrect or not sufficient

 (2)  
A decrease of the preload

 (3)  
Unwanted material in the bearing

 (4)  
Other damage that occurs.

 C.  When you operate with damaged bearings, it will cause too much heat in the adjacent parts. Some of these parts are:
 (1)  
The axles

 (2)  
The axle sleeves

 (3)  
The spacers

 (4)  
The wheel hubs.

 D.  These parts can be scored if the bearing damage causes a seizure and causes rotation that is relative to the adjacent parts.
 E.  Make an inspection of the wheel bearings carefully each tire change as shown in the wheel vendor's recommended procedures.
　
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