TM 55-1520-240-23-4
5-121
CHECK BALL SPHERICAL BEARING AXIAL PLAY
5-121
INITIAL SETUP
Applicable Configurations:
All
Tools:
Technical Inspection Tool Kit, NSN 5180-00-323-5114
Pencil
Wood Blocks (3), 6 x 6 x 10 Inches
Materials:
None
Personnel Required:
Medium Helicopter Repairer
Inspector
Equipment Condition:
Off Helicopter Task
Task 5-117
References:
TM 55-1520-240-23P
Task 5-122
Task 5-123.1
Task 5-125
NOTE
Procedure is same to check axial play
in ball spherical bearing on forward
or aft swashplate.
1.
Place swashplate (1) on three wood blocks (2).
2.
Measure distance A from bottom of ball spherical
bearing (3) and flat work surface (4). Measure at
three places. Record average measurement.
3.
Have helper lift and support ball spherical bearing
(3) as high as possible. Measure distance B at
three places. Record average measurement.
4.
Subtract average distance A in step 2 from
average distance B measured in step 3. If the
dimension indicates that axial play is more than
1/8 inch, replace the dry-type bearings (Task
5-122).
5.
If the axial play is more than 0.050 inch, following
replacement of the bearing, check for correct
bearing installation (Task 5-125).
6.
If the bearings are installed correctly and
axial play is more than 0.050 inch, check the
swashplate for excessively worn spherical ball
bearing ring (Task 5-123.1).
FOLLOW-ON MAINTENANCE:
None
END OF TASK
5-671
