Section IV. UNIT TROUBLESHOOTING
Paragraph
Page
4-13.
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26
4-14.
Unit Troubleshooting procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26
4-13. General. This section contains troubleshooting procedures to determine the probable cause of observed equip-
ment malfunctions. Tests or inspections are provided to isolate the faulty component and corrective actions are provided
to eliminate the malfunction.
4-14. Unit Troubleshooting Procedures.
a.
The inspections made while the component(s) is mounted on the equipment are, for the most part, visual. For
thorough inspections, equipment must be down-loaded and components actually operated.
b. The appearance of a component or assembly will indicate its general condition. Examine closely for dented or
cracked surfaces; bent, pinched or broken lines or parts; fungus growth, moisture, corrosion, dirt or other foreign matter;
wear, oil leakage, tampering, or other evidence of misuse that might indicate the source of trouble.
c. Refer to the symptom index to locate the troubleshooting procedure for the observed malfunction. The table lists
the common malfunctions that may occur during the operation or maintenance of the engine. Perform the test or inspec-
tion, and the recommended corrective action in the order listed in the troubleshooting table. If the malfunction is corrected
by a specific corrective action, do not continue with the remaining steps, if any, of the troubleshooting procedure. If the
malfunction is not corrected by the listed corrective actions notify your supervisor.
SYMPTOM INDEX
Symptom
Page
Floodlights Inoperative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13
Clearance and Marker Lights Inoperative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13
Boom Inoperative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .... . .........4-13
Winch Does Not Operate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
Cable Tensioner Inoperative (Model RBT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-15
Cable Tensioner Control Valve Inoperative (Model RBT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
Locking Cylinder Inoperative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
Pressure Indicator In Tripped (Up) Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18
Hydraulic Pump Fails To Deliver Oil (Model 2280) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18
Hydraulic Reservoir Does Not Deliver Sufficient Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18
Bay Does Not Open Properly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18
Ramp Does Not Activate When Pump Handle is Pumped . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19
Bay Lower Lock Drive Screw Does Not Move Freely . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19
TM 5-5420-209-12
4-26
