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|  MIL-T-52843C
can remain stable and permit flow. After 100 connections and
disconnections, the coupler shall meet all require ents specified
m
herein. When coupled and uncoupled with 60 psi applied, the coupler
shall seal the ends of the disconnected lines at the point of
disconnection and shall not permit external fluid loss exceeding 1/2
fluid ounce. At full line flow, the pressure drop across the quick
disconnect coupler shall not exceed 15 psi. The connected couplings
and disconnected halves shall withstand a surge pressure equal to 150
percent of the relief valve setting without evidence of leakage or
rupture. The quick disconnect couplings shall show no leakage and
shall be in accordance with ANSI B93.42 and meet all requirements
specified.
3.12.1.6 Return lines. Return lines shall be in accordance with
SAE J517.
3.12.2 Hydraulic pumps. The hydraulic pump(s) shall have been
tested in accordance with NFPA Recommended Standard T.3.9.18-1976.
When tested in this manner, the contaminant tolerance profile for the
hydraulic pump(s) shall either:
a. Not fall below or cross the B 0 curve of the hydraulic system
1
filter when tested in accordance with MIL-F-52723 (see
4.6.2.21.2).
or else
b. The pump Omega rating shall be less than the filter Beta 10
rating.
3.12.3 System filtration. System filter(s) shall be furnished
either in the pressure line, return line (suction line of charge pump
allowed for filtration of hydrostatics), or combinations (as
specified in 3.12.3.1 or 3.12.3.2 or 3.12.3.3). Labels identifying
each filter shall be provided near the points of filter installation.
3.12.3.1 Return line filters. Although the system filter element
need not be qualified to MIL-F-52723, it shall meet the performance
requirements as stated therein. The filter shall maintain a full flow
condition for the duration of reliability testing as specified in
4.6.2.35. The filter bypass may open for system oil at a temperature
less than 70 F. The filter element shall have been tested to the
performance requirements of MIL-F-52723 at a flow rate equal to or
greater than the truck maximum system oil flow at maximum governed
engine speed. All return oil shall pass through the filter except
relief oil which may return directly to the reservoir. The filter
shall be located so that the element may be removed, without removal
of other components, for examination or replacement without spilling
or draining oil from the reservoir. At the maximum system oil flow
through the filter, including lowering rated capacity load at maximum
governed engine speed and an oil temperature of 150 F 5 F, the
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