Table 4-3. Unit Troubleshooting (Continued)
TEST OR INSPECTION
ELECTRICAL SYSTEM (Continued)
When troubleshooting an electrical malfunction or performing electrical
maintenance, ALWAYS disconnect intervehicular electrical cable from towing
vehicle. Failure to do so may result in injury or death due to electrical shock.
ONE OR MORE LIGHTS INOPERABLE.
Check for burned out or defectiveLEDs /lights.
Check receptacle for proper voltage at receptacle.
If voltage is low, clean receptacle and wires in accordance with paragraph 3-5.
If there is no power at receptacle, unplug wires at receptacle and check for proper
If proper voltage exists, replace receptacle in accordance with paragraph 4-39 or
If there is no power at wires, test voltage at next check point (see schematic,
If proper voltage exists, check for breaks or damage to wires between test points.
If there is no power at check point, continue to next check point. Continue testing
until reaching 24-volt receptacle.
A reading of 2500 PSI is only on gauge (1) when hydraulic controls are in
use. Readings will drop to 500 PSI when levers are disengaged.
The PSI will vary due to load. Hydraulic pressures will vary from 300 to 2500
PSI under normal operation, and will reach a maximum of 2500 to 2800 PSI
under full load.
GOOSENECK LIFT CYLINDER IS INOPERABLE.
Check for leaks.
Notify direct support maintenance for cylinder replacement.