TM 9-2330-381-14
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
HYDRAULIC SYSTEM - CONT
Step 4.
Check for external leaks at hydraulic fittings/joints.
Refer to symptom 17 to check hydraulic leaks.
Step 5.
Check hydraulic tank breather cap for restrictions.
Replace cap if necessary (para. 4-94).
Step 6.
Using hydraulic schematic (figure FO-3) as a guide, operate all semitrailer hydraulics and check
hydraulic hoses for internal collapse or obstructions.
Remove and repair or replace hoses as necessary.
Step 7.
Check that system pressure gage (para. 2-5) is not reading higher than 200 psi (1379 kPa) without
hydraulic controls being operated.
If system pressure is higher than 200 psi (1379 kPa), refer to symptom 18 (steps 3 thru 6) to continue
checking pressure.
Step 8.
Check that system pressure gage is not reading less than 100 psi (690 kPa) without hydraulic
controls being operated.
Check hydraulic tank filter for obstructions or contamination. Clean or replace hydraulic tank filter
Step 9.
Check hydraulic pump ability to develop pressure by operating front curbside suspension handle
downward (para. 2-6). Monitor system pressure gage. Hydraulic pressure should quickly rise to
3800 - 4500 psi (26201 - 31027 kPa).
a. If pressure rises quickly but fails to reach 3800 - 4500 psi (26201 - 31027 kPa), go to symptom
b. If pressure rises quickly, check nonoperating function by using Symptom Index to continue
troubleshooting.
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