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MIL-C-53057(ME)
APPENDIX
TEST METHOD NO. 23
LOW-TEMPERATURE TEST (-25 F)
1. TEST APPARATUS:
a. Cold chamber.
b. Arctic clothing.
c. Thermocouples with potentiometer(s) or other temperature
measuring device.
d. Battery hydrometer.
e. Wattmeter or ammeter.
f. Voltmeter.
2. TEST PROCEDURE:
a. Service the crane with applicable lubricants for -25 F,
operation including engine oil, transmission oil, drivetrain
lubricants, hydraulic oil and antifreeze.
b. Check the specific gravity of battery electrolyte to insure
full charge.
c. Cold soak the crane to attain a stabilized temperature no
warmer than -25 F. During and after this period, examine the
crane for damage.  Stabilization is attained when the engine
coolant, fuel, lubricating oil, and battery temperatures reach
-25 F, as indicated by thermocouples located as follows:
(1) In the two center cells of each battery between the plates
and at mid-depth of the electrolyte.
(2) In the volumetric center of the hydraulic system oil
reservoir.
(3) In the engine lubricating oil gallery and in the oil sump.
(4) In the engine coolant in the engine cooling-jacket discharge
-
pipe.
(5) In the chamber at a horizontal angle of 45 degrees from the
sides and ends of the crane, not less than 3 feet from each
corner of the crane at engine crankshaft level.
-
d. Maintain the -25 F, plus or -5 F, temperature throughout the
entire test.
e. One operator wearing arctic clothing, including mittens, shall
perform all priming and starting operations.
f. Substitute for supplementary batteries or other electrical
cranking energy shall not be used.
g. Glowplugs or other accessories working off the cranking
batteries and auxiliary fluid priming systems which are
permanently mounted on the crane and normally used in starting
the engine may be used.
86

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