TM-9-2320-280-34
TRUCK, UTILITY: M998 SERIES
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
JANUARY 1996
TM-9-2320-280-34 - Page 689 of 1258
TM 9-2320-280-34
Change 1
1 4 - 8 9
1 4 - 1 7 . AIR-CONDITIONING SYSTEM SERV
I C
I N G
This task covers:
a.
Manifold Gauge Set Installation
e.
Evacuating System
b.
Manifold Gauge Set Removal
f.
Charging System
c.
Discharging System
g.
Checking/Adding Refrigerant Oil
d.
Flushing System
________
WARNING
________
• Always wear eye protection around FR-12 and R-12, or when servicing
the air-conditioning system. Injury will result if FR-12 or R-12 comes
in contact with eyes.
• Exercise extreme care when handling FR-12 and R-12; direct skin
contact between FR-12 or R-12 may cause frostbite.
• Never smoke in areas where FR-12 or R-12 is used or stored. Injury to
personnel may result.
• Ensure adequate ventilation whenever FR-12 or R-12 is being
discharged. Injury to personnel may result if used in a confined area.
• Personnel with a history of cardiac rhythm abnormalities should be
made aware of potential aggravation as a result of exposure to FR-12
or R-12. Failure to do so may result in injury to personnel.
• Do not attempt to connect servicing equipment while engine is
running. Injury to personnel or damage to equipment may result.
INITIAL SETUP:
Applicable Models
_______________
M997, M997A1, M997A2
To o l s
____
General mechanic's tool kit:
automotive (Appendix G, Item 1)
Flushing cylinder (Appendix G, Item 103)
Flush gun (Appendix G, Item 104)
Vacuum pump (Appendix G, Item 105)
Special To o l s
__________
Compressor tool kit (Appendix G, Item 101)
Test Equipment
_____________
Manifold gauge set (Appendix G, Item 137)
M a t e r i a l s / P a rt s
_____________
O-ring (Appendix E, Item 106) (R-12 only)
Lubricating oil (Appendix B, Item 35.1)
(FR-12 only)
Refrigerant FR-12 (Appendix B, Item 42.1)
Lubricating oil (Appendix B, Item 35)
(R-12 only)
Refrigerant R-12 (Appendix B, Item 42)
Nitrogen (Appendix B, Item 37)
Flushing agent (Appendix B, Item 15)
O-ring (Appendix E, Item 104.1) (FR-12 only)
Manual Refere n c e s
________________
TM 9-2320-280-10
TM 9-2320-280-20
TM 9-2320-280-34P
General Safety Instructions
______________________
• Always wear eye protection when around FR-12
and R-12.
• Exercise extreme care when handling FR-12 and R-12.
• Never smoke where FR-12 or R-12 is used or stored.
• Ensure adequate ventilation whenever FR-12 or
R-12 is discharged.
• Exposure to FR-12 and R-12 may be hazardous for
individuals with cardiac rhythm abnormalities.
• Do not attempt to connect servicing equipment
while engine is running, and hoses must be clear of
any moving engine parts.
• Make sure hand valves on manifold gauge set are
closed during connection.
• Do not disconnect hoses before back-seating service
v a l v e s
.
• Eye protection must be worn when using com-
pressed air.
• Make sure high side service valve on manifold gauge
set is in OFF/CLOSED position during charging.
Maintenance Level
_______________
Direct support
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