Inserts (Helicoil or Kelox).

TM 750-245-4

spots, scoring, galling, and other surface imperfections

(3) Bolt heads shall not be worn or damaged.

visible to the normal unaided eye.

(4) Threads shall be properly lubricated, if

(2) All bearings shall be of proper type and

required.

size, properly lubricated, and properly installed.

b. Inserts (Helicoil or Kelox).

i. Gears, Belts, and Pulleys.

(1) Inserts or base metal shall not be

(1) Gears

corroded.

(a) Teeth shall not be burred, chipped,

(2) Inserts shall not be cracked, have proper

cracked, galled, deformed, or broken.

application, and be installed properly.

(b) Lubrication shall be of the proper

(3) Inspect keys of key type inserts to insure

type and quantity.

that they are in place and below the surface of the

parent material.

required. Repair shall not be attempted.

c. Blind Nuts.

(d) Disassembled gears (not mounted

(1) Inspect sleeve assembly to insure that the

on shafts) shall be checked for proper pitch diameter,

expander has been set properly as shown in figure 4-6.

total composite error, and tooth-to-tooth error using a

(2) Inspect final assembly to insure that bolt

rolling fixture, master gear set, and super micrometer.

can be tightened without rotation of the expander which

(e) Gears shall be in alinement and

should be set into the sleeve.

mesh properly.

d. Quick Acting Fasteners.

(f) Shielded bearings shall be replaced

(1) Mechanical operation and alinement shall

when required. No repair shall be attempted..

be correct.

(g) There shall be no excessive noise

(2) Hardware shall not be loose, missing, or

or rough motion.

damaged.

(h) Teeth of antibacklash gears shall be

(3) Lubrication shall be of correct type and

properly alined.

quantity.

(i) When disassembled, gears shall be

e. Rivets.

coded for replacement in same assembly.

(1) Assure correct size rivet is used.

(2) Belts

(2) Assure that head is flush against metal

(a) Shall not be cut or cracked.

and that rivet is tight.

(b) Must be pliable.

f. Safety Wiring.

(1) Assure that safety wiring is accomplished

in accordance with requirements contained on pertinent

(d) Installed belts must be taut but not

drawing or technical manual.

tight.

(2) Assure that only new wire is used.

(e) Installed as pairs when required.

g. Shims.

(3) Pulleys

(1) Assure that shims are only used where

(a) Shall not be burred, chipped,

authorized.

cracked, galled, deformed, or broken.

(2) Assure that shims are installed securely.

(b) Groove shall be free of all foreign

matter.

h. Bearings.

(1) Running surfaces shall be characteristic

of a lapping or polishing process and free of tool marks,

chatter, waves, scratches, gouges, nicks, pits, soft

4-6