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Page Title:
Tes Method No. 19 - Hydraulic Filter and Filter Assemblies |
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| MIL-C-53057(ME)
APPENDIX
TEST METHOD NO. 19
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 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 l0 psi
more than determined in b. 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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