TM 5-2350-378-23&P
0015
HYDRAULIC OIL OVERHEATS - Continued
STEP
34.
Perform actuator internal leakage test on No. 1 or No. 4 actuators where excessive heat in circuit 9 or 2 hoses
was detected using HDC.
WARNING
Do not work under vehicle unless hull is properly blocked or allowed to settle on bump
stops. Failure to comply may result in severe injury or death to personnel.
NOTE
First procedure below, using HDC system, is for No. 4 left actuator internal leakage
test. Manual procedures for No. 4 right, No. 1 left, and No. 1 right actuators are same,
but HDC system is not used during test. Ports are in same location on opposite face.
Circuits 2 and 9 are same.
Have suitable container ready to catch oil.
a.
Stop engine; relieve hydraulic pressure.
b.
No. 4 Left Actuator (using HDC system).
(1)
Reset all HDC solenoid valves by selecting RESET VALVES button (Figure 45, Item 4) on HDC
control box.
(2)
Using LINE UP or LINE DOWN button (Figure 45, Item 2) on HDC control box, select V4 on HDC
display (Figure 45, Item 1).
(3)
Using CHANGE POSITION button (Figure 45, Item 3), close V4 on HDC display
(Figure 45, Item 1). Repeat steps for V7 and V8; closing V7 and opening V18.
(4)
Catch oil in a 2 gal. (7.6 L) container.
(5)
With suspension in SPRUNG mode start engine and check leakage from ports 7 (Figure 46, Item
10), 7B (Figure 46, Item 9), and 17 (Figure 46, Item 2).
(6)
Stop engine; relieve hydraulic pressure.
(7)
Reset all HDC solenoid valves by selecting RESET VALVES button (Figure 45, Item 4) on HDC
control box.
0015-52
03/15/2011Rel(1.8)root(tswp)wpno(T00013)
