TM 9-2330-381-14
4-13. TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
APU - CONT
15.
APU JUMP START SYSTEM INOPERABLE - CONT
Step 2.
Check APU jump start electrical cables connected to APU (grounding) and battery (positive terminal)
for corrosion, loose clamps and connectors, and fraying.
Clean off corrosion and tighten any loose connections, and/or remove and replace defective electrical
cables (para. 4-113).
Step 3.
Check that APU jump start electrical box and internal components are working properly by pressing
test switch button on electrical box (para. 2-30).
If an audible clicking sound is not heard and all of above checks/inspections have not corrected
problem, remove and replace APU jump start electrical box (para. 4-113).
HYDRAULIC SYSTEM
16.
GENERAL HYDRAULIC FAILURES
Step 1.
Check that hydraulic tank shut-off valve is open (para. 2-4).
CAUTION
If APU has run longer than 30 seconds, with the hydraulic tank shut-off valve
closed, pump may be damage and the hydraulic system, including filters, may be
contaminated with metal particles.
Refer to symptom 19 to continue troubleshooting.
Step 2.
Check fluid level in hydraulic tank (para. 4-17).
Check and/or fill hydraulic tank as required (para. 4-19).
Step 3.
Check hydraulic filter indicator (para. 2-5).
Indicator should read in green; if not, remove and replace filter (para. 4-89).
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