TM 9-4110-258-13
SECTION II PREVENTIVE MAINTENANCE CHECKS AND SERVICES
2.3 GENERAL.
Preventive Maintenance Checks and Services (PMCS) are essential to the efficient operation of the refrigeration unit and
to prevent possible damage that might occur through neglect or failure to observe warning symptoms in a timely manner.
Checks and services performed by operators are limited to those functions which can be done from the outside of the
cabinet. The Preventive Maintenance Checks and Services Table 2-1 lists the inspections and care of the refrigeration
unit required to keep it in good operating condition.
2.3.1 Warning and Cautions. Always observe the WARNINGs and CAUTIONs appearing in your PMCS Table.
Warnings and cautions appear before applicable procedures. You must observe these WARNINGs and CAUTIONs to
prevent serious injury to yourself and others or prevent your equipment from being damaged.
2.3.2 Explanation of Table Entries.
2.3.2.1 Item Number Column. Numbers in this column are for reference. When completing DA Form 2404 (Equipment
Inspection and Maintenance Worksheet), include the item number for the check/service indicating a fault. Item numbers
also appear in the order that you must do checks and services for the intervals listed.
2.3.2.2 Interval Column. This column tells you when you must do the procedure in the procedure column. BEFORE
procedures must be done before you operate or use the equipment for its intended mission. DURING procedures must
be done during the time you are operating or using the equipment for its intended mission. AFTER procedures must be
done immediately after you have operated or used the equipment. When a check and service procedure is required for
both WEEKLY and BEFORE intervals, it is not necessary to do the procedure twice if the equipment is operating during
the WEEKLY period.
2.3.2.3 Location, Check/Service Column. This column provides the location and the item to be checked or serviced.
The item location is underlined.
2.3.2.4 Procedure Column. This column gives the procedure you must do to check or service the item listed in the
Check/Service column to know if the equipment is ready or available for its intended mission or for operation. You must
do the procedure at the time stated in the interval column.
2.3.2.5 Not Fully Mission Capable IF: Column. Information in this column tells you what faults will keep your equipment
from being capable of performing its primary mission. If you made a check and service procedure that shows faults
listed in this column, do not operate the equipment. Follow standard operating procedures for maintaining the equipment
or reporting equipment failure.
2.3.3 Other Table Entries. Be sure to observe all special information and notes that appear in your table.
2.3.4 Refrigerant Leaks. Oil is carried with the refrigerant as it flows through the refrigeration system. If a leak develops
in the system, the oil will seep out and soak the copper tubing around the leak or drip and soak or puddle on the frame or
other component below the leak. If any oil or seepage is found, a refrigerant leak would be suspected.
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