Greenlee Textron / Subsidiary of Textron Inc.
21
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
HG3505A / 42303 Portable Power Unit
Appendix A (cont’d)
3. INSTALLATION
After selection of proper hose, the following factors must
be considered by the installer.
3.1 Pre-Installation Inspection - Prior to installation,
a careful examination of the hose must be performed.
All components must be checked for correct style, size,
and length. In addition, the hose must be examined for
cleanliness, I.D. obstructions, blisters, loose cover, or
any other visual defects.
3.2 Follow Manufacturers’ Assembly Instructions.
3.3 Minimum Bend Radius - Installation at less than
minimum bend radius may significantly reduce hose life.
Particular attention must be given to preclude sharp
bending at the hose/fitting juncture.
3.4 Twist Angle and Orientation - Hose installations
must be such that relative motion of machine compo-
nents produces bending of the hose rather than twisting.
3.5 Securement - In many applications, it may be
necessary to restrain, protect, or guide the hose to
protect it from damage by unnecessary flexing, pressure
surges, and contact with other mechanical components.
Care must be taken to insure such restraints do not
produce additional stress or wear points.
3.6 Proper Condition of Ports - Proper physical instal-
lation of the hose requires a correctly installed port
connection while insuring that no twist or torque is put
into the hose.
3.7 Avoid External Damage - Proper installation is
not complete without insuring tensile loads, side loads,
kinking, flattening, potential abrasion, thread damage, or
damage to sealing surfaces are corrected or eliminated.
3.8 System Check Out - After completing the installa-
tion, all air entrapment must be eliminated and the
system pressurized to the maximum system pressure
and checked for proper function and freedom from
leaks.
Note: Avoid potential hazardous area while testing.
4. MAINTENANCE
Even with proper selection and installation, hose life
may be significantly reduced without a continuing
maintenance program. Frequency should be determined
by the severity of the application and risk potential.
A maintenance program should include the following as
a minimum.
4.1 Hose Storage - Hose products in storage can be
affected adversely by temperature, humidity, ozone,
sunlight, oils, solvents, corrosive liquids and fumes,
insects, rodents and radioactive material. Storage areas
should be relatively cool and dark, and free of dust, dirt,
dampness and mildew.
4.2 Visual Inspection - Any of the following conditions
requires replacement of the hose:
(a) Leaks at fitting or in hose. (Leaking fluid is a fire
hazard).
(b) Damaged, cut or abraded cover. (Any reinforcement
exposed).
(c) Kinked, crushed, flattened or twisted hose.
(d) Hard, stiff, heat cracked or charred hose.
(e) Blistered, soft degraded or loose cover.
(f) Cracked, damaged, or badly corroded fittings.
(g) Fitting Slippage on hose.
4.3 Visual Inspection - The following items must be
tightened, repaired, or replaced as required:
(a) Leaking port conditions.
(b) Clamps, guards, shields.
(c) Remove excessive dirt buildup.
(d) System fluid level, fluid type, and any air entrapment.
4.4 Functional Test - Operate the system at maximum
operating pressure and check for possible malfunctions
and freedom from leaks.
Note: Avoid potential hazardous areas while testing.
4.5 Replacement Intervals - Specific replacement
intervals must be considered based on previous service
life, government or industry recommendations, or when
failures could result in unacceptable down time,
damage, or injury risk.
*Reprinted with permission
©
1990 from the Society of
Automotive Engineers, Inc. Handbook.
