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TM 5-4320-308-13
3-8. PMCS PROCEDURES (Continued)
g.
Leakage definitions for PMCS shall be classified as follows:
Class I
Seepage of fluid (as indicated by wetness or discoloration) not great enough to form drops.
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 checked/ inspected.
CAUTION
Equipment operation is allowable with minor leakage (Class I or II). Of course, you must consider
the fluid capacity in the item/system being checked/inspected. When in doubt, notify your
supervisor.
When operating with Class I or Class II leaks, continue to check fluid levels as required in your
PMCS.
Class III leaks should be reported to your supervisor or unit maintenance.
Table 3-1. Unit Preventive Maintenance Checks and Services
CAUTION
During PMCS it may be necessary to run the engine. Since the pump is directly coupled to the
engine, the pump will run when the engine runs. Running the pump for longer than a few seconds
without liquid in the volute will damage the pump. When necessary to run the pump for longer
than a few seconds, make sure that suction and discharge hoses are installed and a source of fuel
is available. Start engine, prime and operate pump to duplicate normal operation and prevent
pump from overheating.
NOTE
If the equipment must be kept in continuous operation, check and service only those items that
can be checked and serviced without disturbing operation. Make the complete checks and
services when the equipment can be shut down. Perform weekly as well as before operation
PMCS if:
(1)
You are the assigned operator and have not operated the item since the last weekly.
(2)
You are operating the item for the first time.
Within designated interval, these checks are to be performed in the order listed.
3-5
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