(2)
The second is an inspection/check of special bushing and bearing configurations. Special bushings and bearings are those with holes, keyways, flanges, threads or other special properties.
(3)
The third is an inspection/check of bushings and bearings (bench check). Do this task after you have done the bench test instructions from the first task. This task gives steps to do a check of the breakaway torque of spherical bearings.
B. You can examine the self-lubricated (teflon-cloth lining) bearings and bushings on the airplane, or removed (bench check). The recommended procedure is the bench check. During the bench check you fully examine the parts for signs of damage from corrosion or cracks. Also, you can do a torque check of the bearing inner race.
TASK 20-20-21-206-001
2. Bearings and Bushings - Inspection/Check________________________________________
A. Procedure - Check of Self-Lubricated Bearings and Bushings (Installed on the Airplane)
S 216-019
CAUTION:_______DO NOT LUBRICATE TEFLON BEARINGS. TEFLON BEARINGS ARE SELF-LUBRICATED. GREASE OR OTHER LUBRICANTS CAN CAUSE LINING DETERIORATION.
(1) Examine the bearings or bushings to make sure they are not too worn or too loose as follows:
NOTE: If you find more than 0.010-inch internal diametrical play,
____ you must carefully examine the bearings or bushings. Reject a bearing that has signs of galling of the bearing surfaces. If there is play but not galling, then examine the parts for a failure condition given at each maintenance inspection. These bearings and bushings do not always have noise when they are loose.
(a)
Try to move and turn the assembly to make sure the bearing or bushing is not too worn.
(b)
Make sure the bearing is not loosely held by its housing or turns in it housing.
(c)
Make sure there is not damage, cracks or too much corrosion on the bearing or housing.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
S 216-003
(2) If you can turn the bearing, or if removal of bolts permits you to turn the bearing, do the steps that follow:
NOTE: If you can see the lining after bolt removal, refer to the
____ bench check instructions and examine the lining material.
(a)
Turn the bearing without a load on the bearing.
1) Make sure it is not too worn, is rough, or has too much drag.
(b)
Turn the bearing while you apply a load.
1) Make sure it is not too worn, is rough, or has too much drag.
S 216-004
(3) Examine the bearings and bushings to make sure there is not lining material that comes out of the housing too far.
NOTE: Some bushings and bearings have some lining material that
____ comes out a small distance when they are made. These bearings and bushings can be serviceable.
B. Procedure - Check of Self-Lubricated Bearings and Bushings (Bench Check)
S 216-020
CAUTION:_______DO NOT LUBRICATE TEFLON BEARINGS. TEFLON BEARINGS ARE SELF-LUBRICATED. GREASE OR OTHER LUBRICANTS CAN CAUSE LINING DETERIORATION.
(1)
Examine the bearing or bushing for physical damage, cracks, corrosion.
S 216-017
(2)
Examine the bearing or bushing to see if it turns in the housing or for fretting on the surfaces without the lining.
NOTE: If the bearing or bushing turns in the housing, you must
____ measure the dimensions to make sure it is not too worn.
S 216-006
(3) Manually turn the bearings and feel for signs that it is too rough, too loose, has too much drag or unusual drag.
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