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 368 of 790

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

0016 00--65

HYDRAULIC OIL OVERHEATS -- Continued

0016 00

Figure 48. Apron Cylinder Leakage Test

APRON CYLINDER LEAKAGE TEST

CAUTION

Ensure apron cylinders are blocked prior to retracting disconnected

cylinder rod ends. Cylinders will drop and damage hoses.

NOTE

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Armor plates 1L and 1R must be removed to expose apron cylinder.

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Have suitable container ready to catch oil.

Start engine, lower apron completely, and disconnect right--hand and left--hand end of

cylinder rods (Figure 48, item 4) from apron (Figure 48, item 5).

Retract cylinder rods (Figure 48, item 4) approximately halfway.

Stop engine; relieve hydraulic pressure.

Disconnect CKT--20 (REAR) TEE hose (Figure 48, item 2) and CKT--20 (REAR) TEE

tube (Figure 48, item 1) from tee (Figure 48, item 3) on hull floor. Cap and plug hose,

tube, and fittings.

Start engine, have assistant hold APRON CONTROL lever in UP position. Measure the

extension of both cylinder rods (Figure 48, item 4). Continue to hold APRON

CONTROL lever in UP position for one minute. Measure the extension of both cylinder

rods (Figure 48, item 4) again.

Have assistant return APRON CONTROL lever to NEUTRAL position. If extension rate

is greater than 1/2 in. (13 mm) per minute, the cylinder is leaking excessively.

Stop engine; relieve hydraulic pressure.