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 521 of 790

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

0022 00--38

APPARENT HDC SYSTEM PROBLEM -- Continued

0022 00

YES

NO

from block 66

NO

NO

69

Substitute a spare (good) solenoid valve with the

“CIRCUIT FAULT” solenoid valve and repeat the test.

68

Perform continuity test and check for short

circuit to cable (connector case/shell) for the

two pins/wires in the W4 cable that go from

connector W4P2 or W4P3 (as applicable),

normally connected to the HDC control box, to

the W4P5 or W4P6 connector (as applicable)

normally connected to the umbilical disconnect

bracket.

Disconnect umbilical cable W4 connector W4P2

on W4P3 (from HDC control box connector J2 or

J3, as applicable) associated with designated

“CIRCUIT FAULT” solenoid valve.

Does an open circuit or short circuit exist in the

umbilical cable assembly W4 wiring circuit

(”CIRCUIT FAULT” solenoid valve 28 VDC

energizing circuit) being checked?

YES

NO

70

Replace HDC control box.

71

Replace the original “CIRCUIT

FAULT” solenoid identified by the BIT

valve (WP 0031 00, WP 0032 00,

WP 0033 00, WP 0034 00).

Are the results the same?

Resume the HDC system

functional check--out.

72

Replace umbilical cable assembly W4.

Resume the HDC system functional

check--out.