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| MIL-T-52953C
APPENDIX
TEST METHOD NO. 2
DRIFT
1.
TEST COURSE:
a.
Level, flat surface.
2.
TEST APPARATUS:
a.
Temperature thermocouple and potentiometer or equivalent temperature
measuring device.
b.
Clinometer.
3.
TEST PROCEDURE:
a.
Install the thermocouple in the volumetric center of the hydraulic-
system oil reservoir. Heat the hydraulic oil by exercising hydraulic
functions until the oil temperature exceeds 120 degrees Fahrenheit.
Maintain oil temperature above 120 degrees Fahrenheit for the
duration of the test.
b.
Raise rated load to maximum lift height. Tilt mast to true vertical
position measured with the clinometer. Mark reference point.
c.
Hold the load for 2 minutes and record the downward drift and
rotational drift in that period.
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