Troubleshooting is a logical, systematic search for the cause(s) of malfunction(s). Direct
Support troubleshooting of the transmission can only be performed with the transmission
installed in the vehicle.
When troubleshooting is performed with the transmission in a vehicle, the
information in this manual will be used in conjunction with the information
contained in the applicable - 20 level vehicle manual.
The purpose of troubleshooting is to establish the nature and extent of repair required to return
the transmission to serviceable condition. Thorough troubleshooting before the transmission is
removed from the vehicle may reveal malfunctions external to the transmission. Correction of
such external malfunctions may prevent the unnecessary effort of removing the transmission.
Troubleshooting by a Direct Support shop is necessary to verify the diagnosis made before the
transmission was removed. Such troubleshooting may be the only means of uncovering all
defects in a transmission received in an unserviceable condition from another activity.
Troubleshooting may be necessary to determine the cause when a repaired transmission fails to
Malfunction, Test or Inspection, and Corrective Action
Malfunction, Test or Inspection, and Corrective Action Procedure
Solenoid Testing Procedures
Pressure Checking Procedures
2-1. PRELIMINARY INSPECTION
Maintenance personnel must have a thorough knowledge of vehicle operation
before attempting to troubleshoot an installed transmission. The purpose and use
of all operator controls must be thoroughly understood. Refer to the technical
manual for the vehicle, TM9-1450-300-10 (M730A2 vehicle) or
TM9-2350-277-10 (M113A3 vehicle), for all procedures concerning the operation
of the vehicle
Verification of all preliminary checks at crew and organization level should be made.
If preliminary troubleshooting of the vehicle is not conclusive, refer to. Organizational manual