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4. 3. 2.4 Relief valve check. - The torque drum shall be engaged with the output
shaft. The maximum output torque in each direction shall be measured to check the
transmission relief valve. The dial of the transmitter gearing shalI be rotated by hand
until maximum pull on the spring balance is reached for output rotation in both direc-
tions. This test should not be applied for more than 5 seconds because of the excessive
heating in the high pressure relief valve. The torque developed shall be between 50
and 75 pound-inches at the hydraulic motor shaft.
4.3.2.5 Surge. - Change of rate shall be measured by matching the rate from a
constant speed mo against the rate of the transmission and valve assembly. These
ed
rates are the inputs to a differential; the output of the differential will the be the
change in rate, Rates shall be measured between 200 and 500 mils per second.
4.3.3 Complete oil gear. - During tests, limit cam shall be set for azimuth
operation.
4.3.3.1 Replenishing Pump pressure. - Power shall be applied at motor and
cheek shall be made for proper rotation by observing oil pressure at filter. Pressure
shall be in accordance with 3.4.2.2. Motor rotation should be correct when the plus
and minus terminals of the d-c power source are connected to motor leads M and G,
respectively.
4.3.3.2 outPut speed. - The limit stop screw shalI be adjusted in clockwise and
coounterclockwise direction until output speed meets the requirements of 3.4.2.4.
4.3.3.3 Creepage.- With the oil gear having been synchronized previously with
the test director and at rest for at least 5 Seconds, the creepage shall be checked by
switching off the synchro excitation. The unit shall meet the requirements of 3.4.2.7,
4.3.9.4 Surge. - Change of rate shall be measured by matching the rate from a
constant speed motor against the rate of the oil gear assembly. These rates are the
Inputs to a differential. The output of the differential will then be the change in rate.
Rates shall be measured between ZOO and 500 mils per second.
4.4 Environmental
4.4.1 General. The environmental tests specified shall be limited to those con-
/"
tained in the following paragraphs. Three of the first five oil gears and one out of
every additional 100 or fraction thereof shall be tested.
4.4.2 Temperature. - The oil gear shall be exposed to an air temperature of
o
o
minus 62. 2 C (-80 F) for a period of 3 days. The air temperature then shall be
o
raised to minus 31.2 C (-25F) and after the internal temperature of the oil gear has
reached equilibrium (approximately 4 hours) t it then shall be operated until the oil
temperature has stabilized. The oil gear shall then be tested for conformance with
the performance requirements of this specification. The air temperature shall be
I
o
raised to plus 71 C ( + 160 F) and after the internal temperature of the oil gear has
o
reached equilibrium at that temperature it shall be allowed to remain at that temper-
ature for a period of 4 hours. The air temperature shall be reduced to plus 51. 5C
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