TM 9-2350-247-20-1
PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS), INCLUDING
LUBRICATION INSTRUCTIONS — Continued
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CLASS II
Fluid leakage is great enough to form drops. Drops do not drip from the item being
checked or inspected.
CLASS III
Fluid leakage is great enough to form drops that fall from the item being checked or
inspected
NOTE
You are allowed to operate equipment with minor water or oil 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. Any fuel or Class III leaks will make the vehicle NOT READY/
AVAILABLE.
b.
CHECKING FOR LEAKS AFTER A MAINTENANCE TASK. After doing maintenance on a part which involves
hoses or 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.
1)
Do visual inspections to find the source of the leak.
a)
Check for cracks on housing or cover.
b)
Check that screws and any connections are not loose or overtight.
2)
If you cannot see the source of the leak, check the items listed below.
a)
Check that preformed gasket is not bent, or pinched.
b)
Check machined surfaces for fit and cleanliness.
c)
If leak persists, notify supervisor.
c.
CHECKING FOR LEAKS USING CHALK TEST. Following replacement, repair, or adjustment of a door, access
panel, or rubber seal, check for leaks by performing a chalk test. Use the following procedure:
1)
Use chalk or chalk powder to coat area around seal.
2)
Close door or panel.
3)
Open door or panel.
4)
Check for unbroken chalk line on mating surface. Where chalk does not stick to mating surface, there is a leak
in the seal surface.
5)
If a leak is found, perform adjustment to correct the problem.
6.
WARM-UP ENGINE (M548A1)
To warm up the engine for a maintenance or troubleshooting task, do the following:
a.
Cover air inlet grill.
b.
Start engine (see your -10).
c.
Lock left and right steering levers.
d.
Move gear selector to 2-3 range. Do not release left and right steering levers.
e.
Raise engine speed to 1500 rpm until normal operating temperature is reached.
f.
Lower engine rpm to idle.
g.
Move gear selector to NEUTRAL.
h.
Stop engine (see your -10).
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