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A 747-400 MAINTENANCE MANUAL
 (3)  S 975-004Make a record of the hydraulic fluid temperature that shows on the EICAS HYD or STATUS display for the applicable system.
 (4)  S 865-005Open these circuit breakers: (a) P7 Overhead Circuit Breaker Panel 1) 7F3 HYDIM 1 2) 7G3 HYDIM 2 3) 7H3 HYDIM 3 4) 7J3 HYDIM 4 5) 7G4 HYD FLUID QTY (b) P414 Left Power Distribution Panel 1) E25 HYD FLUID QTY 2) G23 HYD PRESS IND 4 3) C225 AUX HYD PUMP CONT 4 4) AIRPLANES WITH AUXILIARY HYDRAULIC PUMP ON SYSTEM 1; C1711 HYDR PUMP CONT AUX 1 (c) P415 Right Power Distribution Panel 1) K37 HYD PRESS IND 1 2) K38 HYD PRESS IND 2 3) K39 HYD PRESS IND 3
 (5)  S 035-006Disconnect the electrical connector from the temperature transmitter in the applicable hydraulic system.
 NOTE:____ The temperature transmitter is installed on the case drain module.
 (6)  S 485-008Connect a variable resistor of 100 to 200 ohms across the pins 1 and 2 of the electrical connector.
 (7)  S 865-029Close the circuit breaker for the applicable hydraulic system: (a) P7 Overhead Circuit Breaker Panel 1) 7F3 HYDIM 1

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A
747-400 MAINTENANCE MANUAL
 2) 3) 4)  7G3 HYDIM 27H3 HYDIM 37J3 HYDIM 4
 (8)  S 865-031Slowly increase the resistance across the pins 1 and 2 of the electrical connector.
 (9)  S 975-030Make a record of the resistance at which the SYS FAULT light, for the applicable hydraulic system, comes on.
 S 735-011

 (10)
 Make sure this resistance is 124 to 134 ohms.

 S 215-032

 (11)
 Make sure the HYD TEMP indication, for the applicable hydraulic system, on the EICAS HYD display is 101-107 degrees.

 S 215-033

 (12)
 Make sure the EICAS message, HYD OVHT SYS 1 ( 2, 3, or 4), shows on the EICAS display.

 S 865-034

 (13)
 Slowly decrease the resistance between the pins 1 and 2 of the electrical connector.

 S 975-035

 (14)
 Make a record of the resistance at which the SYS FAULT light, for the applicable hydraulic system, goes off.

 S 735-015

 (15)
 Make sure this resistance is 111 to 121 ohms.

 S 215-036

 (16)
 Make sure the HYD TEMP indication, for the applicable hydraulic system, on the EICAS HYD display is between 70-80 degrees.

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A
747-400 MAINTENANCE MANUAL
 S 215-037
 (17) Make sure the EICAS message, HYD OVHT SYS 1 ( 2, 3, or 4), does not show on the EICAS display.
 S 865-038
 (18) Open the circuit breaker for the applicable hydraulic system:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7F3 HYDIM 1
 2) 7G3 HYDIM 2
 3) 7H3 HYDIM 3
 4) 7J3 HYDIM 4

 S 085-019
 (19) Remove the variable resistor from the electrical connector.
 S 435-020
 (20) Connect the electrical connector to the temperature transmitter on the case drain module.
 S 865-042
 (21) Close these circuit breakers:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7F3 HYDIM 1
 2) 7G3 HYDIM 2
 3) 7H3 HYDIM 3
 4) 7J3 HYDIM 4
 5) 7G4 HYD FLUID QTY

 (b)  P414 Left Power Distribution Panel
 1) E25 HYD FLUID QTY
 2) G23 HYD PRESS IND 4

 (c)  P415 Right Power Distribution Panel
 1) K37 HYD PRESS IND 1
 2) K38 HYD PRESS IND 2
 3) K39 HYD PRESS IND 3

 S 975-039
 (22) Make a record of the HYD TEMP indication, for the applicable hydraulic system, that shows on the EICAS display.
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