The Direct Support Troubleshooting Symptom Index, Table 3-1, lists the common malfunctions which may
occur. It refers you to the proper page for troubleshooting procedures.
This manual cannot list all possible malfunctions that may occur, all tests or inspections that must be
performed, or all corrective actions for each malfunction. If a malfunction is not listed, or is not remedied by corrective
actions, notify personnel at next highest maintenance level.
Prior to using troubleshooting trees, be sure you have performed all normal operational checks. Refer to the
electrical schematic (Figure FO-2) and hydraulic flow diagram (Figure FO-1) to assist in troubleshooting.
When troubleshooting a malfunction:
Question the operator and/or unit maintenance level personnel to obtain any information that might help
determine the cause of the malfunction. Before continuing, ensure that all applicable operator and unit
level troubleshooting has been performed.
Locate the symptom or symptoms in Table 3-1 that best describe the malfunction. If the appropriate
symptom is not listed, notify your supervisor.
Turn to the page where the troubleshooting procedures for that malfunction are described.
Perform each step in order until the malfunction is corrected. Do not perform any maintenance task
unless the table directs you to do so.
Table 3-1. Direct Support Troubleshooting Symptom Index
Engine Cranks But Will Not Start, No Smoke From Exhaust
Low Engine Oil Pressure
Excessive Engine Vibration
Inadequate/Poor Engine Compression
Transmission Malfunction, Low Oil Pressure
Transmission Malfunction, Low Torque Output
Transmission Will Not Engage or Disengage
Use the symptom index to quickly locate a particular fault or malfunction. All related troubleshooting steps contained in
Chapter 2 must be performed prior to attempting to isolate a malfunction to a specific component addressed in this