TM 9--2815--247--34
0012 00--9
GENERAL MAINTENANCE INSTRUCTIONS -- CONTINUED
0012 00
REPLACEMENT OF HELICAL--COIL AND THREADED INSERTS
General
Replace all helical--coil and screw thread inserts which do not fit securely in the casting or when casting threads
have become galled or stripped.
Replacement
Replace all unserviceable helical--coil and screw thread inserts in the same manner as outlined in the following
instruction. For instructional purposes, helical--coil inserts in the cylinder assembly will be replaced.
Use a diamond--shaped punch to remove the staked, serrated--tooth type section of insert (1) from the thread in
cylinder casting.
Install screw thread insert extractor (2) (item 108 or 109, WP 0103 00) into insert. Remove insert by applying
constant pressure while turning extractor counterclockwise until insert is removed.
NOTE
The special coil screw lock inserter tools (items 103
through 107, WP 0103 00) must be used when installing
the self--locking thread type inserts. These special insert-
ers are further identified by painted areas marked either
with a red handle or a red stripe around the body.
Thread new insert (1) into the threaded guide of inserter (3) by slowly turning the pilot (4) until insert is flush with
the end of the tool. Insert the pilot of the screw thread inserter (3) into the threaded hole in cylinder with face of the
inserter resting solidly against the casting as shown.
Slowly turn handle (5) of pilot clockwise until no further resistance is felt. The insert will then be flush with cylinder
casting. Remove inserter and break off insert tang.
5
1
2
3
4
1
|
|
