4-9. GENERAL MAINTENANCE PROCEDURES - Continued
Teflon Hose - Medium Pressure (with Vacuum Service)
Carefully examine both hose end fittings. Discard hose end fittings if any sign of damage is
evident. Proceed to steps (c thru 1) following, to reassemble new hose assembly using new hose
If hose end fittings are to be reused, remove from old hose. Clamp socket in vise. Unscrew
nipple (in a counterclockwise direction) and remove. Slide the socket away from the hose end by
tapping on flat surface. Using pliers, pull the sleeve from hose.
It is recommended that new sleeves be used when old fitting is reused.
Wrap tefIon hose with masking tape (item 52, Appendix E) at cut-off area. Using a cut-off saw or
a fine-tooth hacksaw, cut hose square to length. Remove all tape. Trim any extending wires flush
with hose end, then remove hose material burrs.
Death or serious injury could occur if compressed air is directed
against the skin. Do not use compressed air for cleaning or
drying unless the pressure is/has been reduced to 30 psi (2.11
kg/cm2) or less. When working with compressed air always use
chip guards, eye protection and other personal protective
Using compressed air, blow out shavings from hose bore.
Slip two sockets onto new hose. Ensure the sockets are back to back.
Push a sleeve over the end of the tube and under the wire braid by hand. Position sleeve in hose
by pushing the hose against a flat surface. Ensure the tube stock butts against the inside
shoulder of the sleeve.
Set the sleeve barbs into the Teflon tube by installing the end of the sleeve and
tube over the
nipple and then work the hose bore over the nipple.
Lubricate the nipple and socket threads with hydraulic oil (item 28, Appendix E).
Clamp the nipple hex in a vise. Push the hose over the nipple using a twisting action until seated
against nipple clamper. Push socket forward and thread onto nipple hand tight.
Invert hose assembly and clamp socket in vise. Tighten nipple in a clockwise direction until 1/32
in. (.8 mm) clearance between nipple and socket is achieved. Further tightening is acceptable if
socket and nipple hexes are to be aligned.