TM 5-2350-378-23&P
0008
APRON WILL NOT RAISE - Continued
STEP
3.
Perform V17 test.
a.
Reset all HDC solenoid valves by selecting RESET VALVES button (Figure 2, Item 5) on the HDC control
box.
b.
Wait for transducer T-1 hydraulic pressure on the HDC display (Figure 2, Item 1) to drop below 500 psi
(3,447 kPa).
c.
Using LINE UP or LINE DOWN button (Figure 2, Item 3), select V17 on the HDC display
(Figure 2, Item 2).
d.
Close V17 on the HDC display (Figure 2, Item 2) by selecting the CHANGE POSITION button
(Figure 2, Item 4) on the HDC control box.
e.
Have assistant start engine (if engine is already running) and move APRON CONTROL lever to UP
position (RAISE).
f.
Read transducer T-1 hydraulic pressure on the HDC display (Figure 2, Item 1).
g.
Stop engine; relieve hydraulic pressure.
h.
Reset all HDC solenoid valves by selecting the RESET VALVES button (Figure 2, Item 5) on the HDC
control box.
1
2
3
4
5
T00604HDC
Figure 2. Hydraulic Diagnostic Center (HDC) Control Box.