TM-9-2320-280-34 HMMWV Direct Support & General Support Maintenance Manual Download
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14-21. EXPANSION VALVE REPLACEMENT This task covers: a. Removal b. Installation INITIAL SETUP: Applicable Models _______________ M997, M997A1, M997A2 Tools ____ General mechanic's tool kit: automotive (Appendix G, Item 1) Materials/Parts _____________ Moisture seal (Appendix E, Item 152) (R-12 only) Three O-rings (Appendix E, Item 105) (R-12 only) Lubricating oil (Appendix B, Item 35) (R-12 only) Lubricating oil (Appendix B, Item 35.1) (FR-12 only) O-ring (Appendix E, Item 106) (FR-12 only) O-ring (Appendix E, Item 104.2) (FR-12 only) Two O-rings (Appendix E, Item 105) (FR-12 only) Moisture seal (Appendix E, Item 151.1) (FR-12 only) Manual References ________________ TM 9-2320-280-20 TM 9-2320-280-24P Equipment Condition _________________ • Air-conditioning system discharged (para. 14-17). • Evaporator blower housing opened (TM 9-2320-280-20). General Safety Instructions ______________________ Air conditioner system must be discharged prior to replacing components. Maintenance Level _______________ Direct support a. Removal TM 9-2320-280-34 14-114 Change 1 WARNING Air conditioner system must be discharged prior to replacing components in vapor system. Failure to do this may result in injury to personnel or damage to equipment CAUTION Cover or plug all open hoses and connections immediately after disconnection to prevent contamination. Remove all plugs prior to connection. 1. Remove moisture seal (3) from evaporator outlet tube (1). Discard moisture seal (3). 2. Loosen clamp (2) and slide control tube (12) from clamp (2). 3. Disconnect expansion valve pressure tube (7) from evaporator outlet tube (1) and remove O-ring (13). Discard O-ring (13). NOTE Perform steps 4 and 5 for FR-12 systems only. 4. Remove screw (10) and clamp (8) securing sight glass tube (11) to evaporator (14). 5. Disconnect and remove sight glass tube (11) and two O-rings (9) from thermo expansion valve (6) and sight glass tube (15). Discard O-rings (9). NOTE Perform step 6 for R-12 systems only. 6. Disconnect expansion valve (6) from sight glass tube (11) and remove O-ring (9). Discard O-ring (9). 7. Disconnect and remove expansion valve (6) from inlet tube (4) and remove O-ring (5). Discard O-ring (5). b. Installation CAUTION • During installation of expansion valve, avoid excessive bending or kinking of control tube and pressure tube. • Avoid overtightening of clamp securing expansion valve control tube to outlet tube.