Table 3-1. Operator/Crew Troubleshooting Table - CONT
TEST OR INSPECTION
HYDRAULIC SYSTEM - CONT
Steering and suspension system hydraulic lines are under pressure even when
APU is not running. Do not attempt to tighten, loosen, adjust, or repair fittings,
lines, or hoses until semitrailer is supported by support legs (para. 2-22 and 2-23)
and all pressure is relieved or injury to personnel may result.
Check hydraulic fittings/joints for leaks.
Check tightness of fittings and tighten. If tight and leaking, notify unit maintenance.
Inspect for split or ruptured hydraulic hoses and lines.
If a split or ruptured line is found, notify unit maintenance.
Check for external cylinder leaks.
If fluid is leaking out around cylinder rod, wipe down with rag and exercise affected cylinder full travel
in each direction for three cycles. If leakage slows/stops, monitor. If leakage continues, notify unit
SYSTEM WILL NOT MAINTAIN NORMAL OR ADEQUATE OPERATING PRESSURE
Check for general hydraulic failures.
Refer to symptom 10 for general hydraulic failures.
Check for external leaks at hydraulic fittings/joints.
After initial start up, check that system pressure gage (para. 2-5) reads up to 500 psi (3448 kPa)
without hydraulic controls operated.
Check if outside ambient temperature is below 30F (-1C). Hydraulic pressure will normally be
higher until hydraulic fluid warms to normal operating temperature. A gradual decrease in pressure
should occur as hydraulic systems are operated.