MIL-PRF-83766B
application. The high pressure relief valve shall be blocked off on the outlet side and service hose
capped. The high pressure pump shall be operated to produce a stabilized pressure of 4,500 psi.
There shall be no evidence of external leakage, excessive distortion or permanent set. If the
pressure in the system drops below 3,800 psi within a five (5) minute period or if the check valve
protecting the low pressure assembly fails, this shall be cause for rejection.
4.4.4 Pressure gage accuracy. Be accurate to one-fourth of one percent over entire range of
full scale.
4.4.5 Test of relief valves. The filler and pressurization unit shall be filled with hydraulic fluid
conforming to MIL-H-5606 and blocked at the end of the service hose. The high pressure relief
valve and the low pressure relief valve shall be tested for conformance to 3.7.4. The relief valves
shall open and pass fluid back into the reservoir when subjected to the set pressure on the valves.
When the pressure falls below the set pressure, the relief valve shall close.
4.4.6 Mobility tests. Mobility tests shall be conducted to assure conformance to paragraph
3.7.12.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in
the contract or order (see 6.2). When actual packaging of materiel is to be performed by DoD
personnel, these personnel need to contact the responsible packaging activity to ascertain requisite
packaging requirements. Packaging requirements are maintained by the Inventory Control Point's
packaging activity within the Military Department or Defense Agency, or within the Military
Department's System Command. Packaging data retrieval is available from the managing Military
Department's or Defense Agency's automated packaging files, CD-ROM products, or by
contacting the responsible packaging activity.
6. NOTES (This section contains information of a general or explanatory nature which may be
helpful, but is not mandatory.)
6.1 Intended use. The filler and pressurization unit covered by this document is intended for
use in hangars, flight lines, and flight line decks for servicing the hydraulic systems having a
system pressure from 9 to 3,000 psi.
6.2 Acquisition requirements. Acquisition documents must specify the following:
a. Title, number, and date of the specification.
b. Issue of the DoDISS to be cited in the solicitation, and if required,
the specific issue of individual documents referenced (see 2.2).
c. Packaging requirements (see 5.1).
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