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 TM 55-1905-219-14-8
4-30. CONDENSER - AIR CONDITIONING - MAINTENANCE INSTRUCTIONS
(Continued).
2
Installing tubes.
a
Obtain tubes of correct length. Tubes should be of the length shown on the
condenser assembly drawing. If too long, tubes should be cut to required length.
Edges of tubes should be chamfered.
b
Place tube in position between tube sheets.
c
"Set" or expand one end of tube into tube sheet hole to prevent tube from rotating
while it is being rolled. Use a drift pin to "set" one end of tube while using a dolly
bar to back opposite end of tube.
d
Expand tube using special "tube expander" tool furnished for this purpose. Use of
tube expander is described below. After tubes are expanded, face them off flush
with tube sheet.
3
Use of tube expander.
Attach condenser tube expander to a slow speed reversing air motor or hand brace.
Apply lubricating oil freely to expander rollers before using. Place expander into tube
and roll tube until a tight joint is made. At frequent intervals remove tube expander,
rinse in kerosene to remove scale and apply oil to prevent overheating. Keep tube
expander clean and well lubricated. Avoid using worn, rough or chipped rollers or
mandrel. After rolling tube, test for a tight joint and reroll if necessary.
4-917
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