CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONS
2 - 1 0 P R E V E N T I V E M A I N T E N A N C E C H E C K S A N D S E R V I C E S - C o n t i n u e d
Equipment operation is allowable with minor leakage (Class I or II) with exception of fuel leaks.
Consideration must be given to fluid capacity in item/system being checked/inspected. When in
doubt, notify your supervisor.
When operating with Class I or II leaks, continue to check fluid levels as required in your PMCS.
Class III leaks require corrective action and should be reported to your supervisor.
Leakage definitions for Unit PMCS:
CLASS I-Seepage of fluid (as indicated by wetness or discoloration). Not great enough to form
CLASS II-Leakage of fluid great enough to form drops but not enough to cause drops to drip from
item being checked/inspected.
CLASS III-Leakage of fluid great enough to form
drops that fall from the item being
Water may enter the engine exhaust system when washing the vehicle. To prevent this occurrence,
tape the exhaust outlets before washing the vehicle, or operate the engine while washing. Care must
also be taken to prevent water from entering the personnel heater exhaust tube or auxiliary engine
exhaust exhaust by covering the exhaust outlets with tape or cap. Do not use high pressure hoses inside the
Unwashed Vehicle. The driver or crew should present the vehicle for scheduled preventive maintenance services
in a reasonably clean condition. That is, it should be dry and not caked with mud to such an extent as to seriously
hamper Inspection and service.
However, washing of the vehicle should be avoided immediately prior to an
inspection, since certain types of defects such as loose parts and oil leaks may not be noticeable immediately after
Plates. Nameplates, caution plates, and instruction plates found dirty or corroded should be thoroughly cleaned
and heavily coated with clear lacquer. Refer to TM 43-0139.
Services. Unit Maintenance services are defined by, and restricted to, the following general procedures:
Adjust. Make all necessary adjustments in accordance with instructions contained herein.
Special lubrication. Special lubrication applies either to lubrication operations that do not appear
in TM 9-2350-256-10, or to items that do appear, but which should be performed in connection
with the maintenance operations.
Service. Servicing usually consists of performing special operations, such as replenishing batter)
water, draining and refilling units with oil, and changing the oil filters, fuel filters, and air cleaner
Tighten. Tighten all units to torque specified herein or, if not specified, tighten to accepted
practices Use a torque wrench where specified. Do not over tighten, as this may strip threads or