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Page Title:
Tes Method No. 21 - Cylinder Proof |
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| MIL-C-53057(ME)
APPENDIX
TEST METHOD NO. 21
CYLINDER PROOF
1. TEST APPARATUS:
a. Hydraulic test bench or the crane capable of developing two
times system working pressure.
b. Pressure gage.
2. TEST PROCEDURE:
a. Double acting cylinder.
(l) Position and mechanically hold the piston at the
approximate midpoint of the cylinder.
(2) Fill rod end of the piston with oil.
(3) With the head end port open, apply an oil pressure equal
to 1.5 times the working pressure to the rod end of the
piston for minimum of 60 seconds. Release pressure.
(4) Fill the head end of the piston with oil.
(5) With the rod end port open, apply an oil pressure equal
to 1.5 times the working pressure to the head end of the
piston for minimum of 60 seconds. Release pressure.
b. Alternate procedure for double acting cylinder
(1) Extend the cylinder to maximum extension by filling the
head end of the cylinder with oil. Apply oil pressure
equal to 1.5 times the working pressure at the head port
for a minimum of 60 seconds. Release pressure.
(2) Retract the cylinder by filling the rod end of the
cylinder with oil. Apply oil pressure equal to 1.5 times
the working pressure at the rod end port for a minimum of
60 seconds. Release the pressure.
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