TM-9-2320-272-24-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 1 OF 4
JUNE 1998
TM-9-2320-272-24-1 - Page 930 of 1015
TM 9-2320-272-24-1
3-203. SECONDARY AIR RESERVOIR (SUPPLY TANK) REPLACEMENT
THIS TASK COVERS:
a. Removal
b. Installation
INITIAL SETUP:
APPLICABLE MODELS
All except M936/A1/A2
TOOLS
General mechanic’s tool kit (Appendix E, Item 1)
Soft-jawed vise
MATERIALS/PARTS
Four locknuts (Appendix D, Item 291)
Antiseize tape (Appendix C, Item 72)
REFERENCES (TM)
TM 9-2320-272-10
TM 9-2320-272-24P
EQUIPMENT CONDITION
l
Parking brake set (TM 9-2320-272-10).
l
Air reservoirs drained (TM 9-2320-272-10).
l
Toolbox and step removed (para. 3-302).
GENERAL SAFETY INSTRUCTIONS
l
Do not disconnect air lines before draining air
reservoirs.
l
Do not touch hot exhaust system components with
bare hands.
WARNING
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Do not disconnect air lines before draining air reservoirs. Small
parts under pressure may shoot out with high velocity, causing
injury to personnel.
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Do not touch hot exhaust system components with bare hands.
Injury to personnel may result.
a. Removal
1.
Disconnect wet reservoir supply line (8) from elbow (7).
2.
Disconnect drainvalve line (11) from adapter (10).
3.
Disconnect supply line (14) from elbow (13).
4.
Disconnect supply line (15) from adapter (16).
5.
Disconnect two wires (1) from secondary low-air pressure switch (2).
6.
7.
8.
9.
10.
11.
12.
NOTE
l
Secondary reservoir is located below the cab on the right side
frame rail below primary reservoir.
l
Tag air lines for installation.
NOTE
Assistant will support reservoir during steps 6 and 7.
Remove four locknuts (20), screws (18), and two support clamps (19) from hangers (17). Discard
locknuts (20).
Remove secondary reservoir (5) from two hangers (17) and place in soft-jawed vise.
Remove secondary low-air pressure switch (2), adapter (3), and fitting (4) from secondary reservoir (5).
Remove elbow (7) and check valve (6) from secondary reservoir (5).
Remove adapters (10) and (9) from secondary reservoir (5).
Remove elbow (13), adapter (16), and fitting (12) from secondary reservoir (5).
Remove secondary reservoir (5) from vise.
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