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Page Title:
Test Nethod No. 22 Hydraulic Filter and Filter Assemblies |
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| MIL-T-52843C
APPENDIX
TEST METHOD NO. 22
HYDRAULIC FILTER AND FILTER ASSEMBLIES
1.
TEST APPARATUS:
a.
Hydraulic test stand may be used in place of on-vehicle test.
b.
Pressure gages.
c.
Temperature gages.
d.
Flowmeter (when test stand is used).
e.
Provisions for controlling oil temperature, if necessary.
2.
TEST PROCEDURE:
a.
Pressurize the housing to not less than the minimum proof
pressure (100 psi for return line filters, 30 psi for suction
line filter, or 1-1/2 times maximum system pressure for
pressure filters). Hold the pressure for not less than 60
seconds and examine for leaks.
b.
Install a new element in the filter housing. Establish
maximum flow through the filter at an oil temperature of 150
F, 5 F. Measure and record the pressure drop across the
filter assembly.
c.
Plug the filter element chamber oil exit, or otherwise
obstruct all flow through the filter element, leaving the
outlet port open. Establish and maintain the oil temperature
at 150 F, 5 F. Increase the upstream pressure to 10 psi
more than determined in "b" or to 2 psi for suction line
filters. Observe the contamination indicator. Increase
upstream pressure until the indicator enters the bypass area
or until bypass flow exceeds 5 percent of the maximum system
flow, whichever occurs first. Observe and record this
pressure (this is the bypass opening pressure). Increase
pressure until the maximum system flow is attained through
the bypass valve. Observe and record this pressure.
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