TM-9-2320-387-24 HMMWV Direct Support & General Support Maintenance Manual Volume 2 Download
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TM 9-2320-387-24-2 1 25-l 5. A/C SYSTEM SERVICING (Cont’d) I a. hlanifold Gauge Set Installation 1. Turn high-pressure gauge valve (2) and low-pressure gauge valve (1) on manifold gauge set (3) clockwise to seated (closed) positions. 2. Remove two caps (61 from service ports (7) and (8). WARNING Ensure hand valves on manifold gauge are in closed position during connection and hoses are clear of any moving parts in engine compartment. Injury to personnel or damage to equipment may result. 3. Connect low-pressure gauge hose (51 on manifold gauge set (3) to suction (low side) service port (8). 4. Connect high-pressure gauge hose (41 on manifold gauge set (31 to discharge (high side) service port (7). 5. Hang manifold gauge set (3) so hoses (4) and (5) are well away from moving engine parts. NOTE Do not perform step 6 if system is already evacuated. High- and low-pressure hoses must be purged with R-134a for charging purposes (refer to task f.). 6. Slightly loosen low-pressure gauge hose (5) and high-pressure gauge hose (4) at manifold gauge set (3) to purge air from hoses, then tighten. - 25-39