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Page Title:
Tes Method No. 12 - Transmission Stall |
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| MIL-C-53057(ME)
APPENDIX
TEST METHOD NO. 12
TRANSMISSION STALL
1. TEST APPARATUS:
a. Timing device.
b. Thermocouple and potentiometer or equivalent temperature
measuring device.
c. Tachometer.
d. Thermometer.
e. Pressure measurement device.
2. TEST PROCEDURE:
a. Install exhaust system pressure measurement device no more
than 2 inches beyond the header outlet. Record exhaust
pressure during transmission stall, procedure 2 e.
b. Install thermocouple to measure oil temperature of the
transmission.*
c. Thermostat shall not be blocked open.
d. With the ambient temperature not less than 25 F, operate the
crane until the transmission oil outlet temperature is a
minimum of 157 F.
e. Attach the crane pintle hook assembly to a fixed object to
prevent forward motion of the crane by a horizontal force on
the pintle hook assembly. Shift into the highest forward gear
and stall the transmission for not less than 30 seconds while
the engine is operating at governed speed.
f. Record initial transmission oil temperature and maximum oil
temperature after 30 seconds stall, governed speed at stall,
and ambient temperature.
*NOTE: Transmission oil temperatures shall be taken at the outlet
from the converter for hydrodynamic transmission.
75
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