PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS), INCLUDING
LUBRICATION INSTRUCTIONS Continued
Arc length. You will hear a smooth hissing or buzzing sound when the right arc length is struck.
For further welding instructions, see TM 9-237.
12. FLUID LEAKS AND CHECKING FOR LEAKS
You are allowed to operate equipment with minor leaks (Class I or II). You must consider how
much fluid the item or system being checked or inspected can hold. When in doubt notify your
supervisor. When operating equipment with Class I or II leaks, continue to check fluid levels as
required in your PMCS. Report Class III or fuel leaks to your supervisor, or notify unit
maintenance for corrective action right away.
GENERAL. Fluid leaks in hoses and fluid lines affect the carrier parts operation.
The types and classes of leaks follow:
CLASS I. Fluid seepage is not great enough to form drops, but is shown by wetness or color changes.
CLASS II. Fluid leakage is great enough to form drops. Drops do not drip from the item being checked or
CLASS III. Fluid leakage is great enough to form drops that fall from the item being checked or inspected.
CHECKING FOR LEAKS AFTER A MAINTENANCE TASK. After doing maintenance on a part which
involves hoses of fluid lines, check for leaks. If leaks occur after you have done a replace or repair task, find the
source of the leak. Correct the problem. Follow these procedures:
Do visual inspections to find the source of the leak.
Check for cracks on housing or cover.
Check that screws and any connections are not loose, or overtight.
If you cannot see the source of the leak, check the following items:
Check that preformed gasket is not bent, or pinched.
Check machined surfaces for fit and cleanliness.
If leak persists, notify supervisor.
PREVENTIVE MAINTENANCE CHECKS AND SERVICES
There are no preventive maintenance checks and services (PMCS) or lubrication procedures required for the M113A3 FOV
Carriers at the direct support maintenance level. For crew level PMCS and lubrication procedures, see your -10. For unit level
PMCS and lubrication procedures, see your -20.