TM-5-2350-378-24-P

HYDRAULIC DIAGNOSTIC CENTER (HDC) SUPPORTING ARMORED COMBAT EARTHMOVER (ACE), M9

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST

TM-5-2350-378-24-P - Page 392 of 790

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

HYDRAULIC OIL OVERHEATS -- Continued

0016 00

Figure 64. HDC Control Box

ACTUATOR INTERNAL LEAKAGE TEST

WARNING

Do not work under vehicle unless hull has been properly blocked or

allowed to settle on bump stops. Failure to comply may result in

severe injury or death to personnel.

NOTE

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First procedure below, using the 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 the same but the HDC system is not used

during the test. Ports are in same location on opposite face. Circuits 2

and 9 are the same.

S

Have suitable container ready to catch oil.

Stop engine; relieve hydraulic pressure.

No. 4 Left Actuator (using HDC system)

Reset all HDC solenoid valves by selecting the RESET VALVES button (Figure 64,

item 4) on the HDC control box.

Using LINE UP or LINE DOWN button (Figure 64, item 2) on the HDC control box,

select V4 on the HDC display (Figure 64, item 1). Using the CHANGE POSITION

button (Figure 64, item 3), close V4 on the HDC display (Figure 64, item 1). Repeat

steps for V7 and V8; closing V7 and opening V18.

Catch oil in a graduated 2 gal (7.6 L) container.

With suspension in SPRUNG mode start engine and check leakage from ports 7, 7B,

and 17.

Stop engine; relieve hydraulic pressure.

Reset all HDC solenoid valves by selecting the RESET VALVES button (Figure 64,

item 4) on the HDC control box.

Continued on page 0016 00--91.

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