TM 5-2330-325-14&P
a.
Standard Compression Fittings: Tubes with inverted nuts and compression fittings are
designed for one time assembly. Once assembled, they must be replaced as a unit if any parts
are found defective. Used parts may not seal properly when used with new ones. Used tube
assemblies in good condition can be reinstalled to their original location without leaking.
Assemble new tubes, compression sleeves, and inverted nuts as follows:
(1)
Slide inverted nut (2) onto end of tube (3).
(2)
Slide compression sleeve (1) onto end of tube (3).
(3)
Repeat previous two steps for other end of tube as required.
(4)
Insert end of tube as far as it will go into compression fitting to which tube is being installed.
(5)
Twist inverted nut (2) into compression fitting and tighten inverted nut against compression
sleeve (1) with open-end wrench. Compression sleeve will clamp down around tube and
conform to internal surface of compression fitting and inverted nut.
(6)
Repeat previous two steps for other end of tube as required.
b.
Prestomatic Push-In Fittings: Microlok fittings are used for some of the connections at the
spring brake control valve. A push-on collet collar grips or releases the tubing as required to
provide a quick disconnect/connect feature of the air line tubing to the fitting, without the use of
tools. To separate tubing from fitting depress the fitting collar until it bottoms against the fitting
and withdraw the tubing. To assemble tubing onto fitting, insert the tubing into the fitting until it
bottoms. (Pushing on tubing twice to verify that tubing is inserted past collet and O-Ring) pull
fitting collar out to lock tubing and pull on tubing to verify it is locked in place. Tubing cut for
insertion into the fitting must be squarely out. The maximum allowable angle is 15. Use of a
tube cutting tool is recommended.
