4-9. GENERAL MAINTENANCE PROCEDURES - Continued
e. Hose Assembly Replacement. There are two different styles of hose assemblies. Described below are
procedures for hose replacement.
If original hose route cannot be followed at time of replacement,
find alternative route and measure for new hose length.
(1) General Purpose - High Temperature; Hydraulic, Air and Fuel Application.
Carefully examine both hose end fittings. Discard hose end fittings if any signs of damage are
evident. Proceed to steps (d thru j), following, to assemble new hose assembly using new hose
If hose end fittings are to be reused, remove from old hose. Clamp socket in a vise. Remove
nipple from hose and socket by unscrewing in a counterclockwise direction.
Once nipple is removed, invert hose and reclamp socket in vise. Unscrew hose from socket by
turning hose in a clockwise direction. If hose is excessively long, socket removal is possible by
clamping hose in vise and unscrewing socket from hose in clockwise direction.
Using a cut-off saw or a fine tooth hacksaw cut new hose square to length.
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.
Clamp socket in vise. Thread new hose into socket in a counterclockwise direction until it
bottoms out. Then back out hose 1/4 turn.
Using hydraulic oil (item 28, Appendix E), liberally lubricate nipple threads and inside of hose.
Insert nipple into hose and socket and tighten in a clockwise direction. Leave 1/32 in. (.8 mm)
between nipple hex and socket.
(i) To prevent any contamination from new hose assembly, blow out hose assembly using compressed air.
Rinse inside of hose with hot water. Do not allow water temperature to exceed 180 deg. F (82 deg. C).
Using compressed air, blow out all water from hose assembly.
(j) If hose assembly is not going to be installed immediately after installing fittings, cap both ends to keep hose