TM-5-2350-378-24-P

TM 5--2350--378--24&P

0005 00--10

USING THE HYDRAULIC DIAGNOSTIC CENTER (HDC) SYSTEM TO TROUBLESHOOT

THE M9 HYDRAULIC SYSTEM -- Continued

0005 00

15. Valve V17 check:

a. Push the RESET VALVES button on the HDC Control Box, and verify all the valves are set to the power

OFF setting and are in the default position as shown in Table 1.

b. Use the LINE UP and LINE DOWN buttons to select valve V17. Press CHANGE POSITION to close

valve V17.

Have the vehicle operator move the APRON control lever to LOWER until transducer T1 reads less than

500 psi (3447.379 kPa).

d. Have the vehicle operator move the APRON control lever to RAISE until transducer T1 reads greater

than 3000 psi (20684.27 kPa). (This indicates that V17 has directed flow from the apron circuit to

transducer T1.)

16. Valve V1 check:

a. Turn off the HDC Control Box by depressing the POWER button.

b. Have the vehicle operator stop the engine.

Manually open valve V23 by moving the handle to a fully vertical position.

d. Have the vehicle operator start the engine.

e. Power up the HDC Control Box by pressing the POWER button.

Use the LINE UP and LINE DOWN buttons to select valve V1. Press CHANGE POSITION button to

close valve V1.

g. Have vehicle operator move the EJECTOR CONTROL lever forward and backward. Ensure that the

ejector does not move. (This indicates that valve V1 has closed.)

h. Push the RESET VALVES button on the HDC Control Box and verify all the valves are set to the power

OFF setting and are in the default position as shown in Table 1.

17. When the Functional Check--Out is complete, proceed to use the HDC system as an aid to troubleshoot a

problem with the vehicle hydraulic system or shut down the vehicle per TM 5--2350--262--10 and stow the

HDC Control Box and umbilical cable W4.

TM-5-2350-378-24-P - Page 69 of 790