TM-9-2320-260-34-1
TRUCK, 5-TON, 6X6, M809 SERIES (DIESEL)
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE; VOLUME 1 OF 2
JULY 1994
TM-9-2320-260-34-1 - Page 620 of 657
TM 9-2320-260-34-1
11-4. UNLOADER VALVE REPLACEMENT
THIS TASK COVERS:
a. Removal
b. Installation
INITIAL SETUP
APPLICABLE MODELS
All
TOOLS
General mechanic’s tool kit
(Appendix B, Item 1)
MATERIALS/PARTS
Packing (Appendix D, Item 311)
Packing (Appendix D, Item 313)
Antiseize tape (Appendix C, Item 50)
REFERENCES (TM)
TM 9-2320-260-10
TM 9-2320-260-20
TM 9-2320-260-34 P-1
EQUIPMENT CONDITION
“
Air reservoirs drained (TM 9-2320-260-10).
l Radiator drained (TM 9-2320-260-20).
GENERAL SAFETY INSTRUCTIONS
l
Drain air reservoirs before disconnecting air lines.
c Hold down unloader valve assembly during
removal.
a. Removal
WARNING
Drain air reservoirs before disconnecting air lines. Small parts
under pressure may shoot out with high velocity, causing injury to
personnel.
1.
Loosen nut (3) and disconnect air governor tube (4) from elbow (2).
WARNING
Unloader valve assembly must be held down during removal.
Small parts under pressure may shoot out, causing injury to
personnel.
2. Remove two screws (7) and washers (6) from air compressor head cover (5) and unloader valve
body (1).
3. Remove unloader valve body (1) from air compressor head cover (5).
4. Remove packings (10) and (11), unloader cap (9), and unloader spring (8) from unloader valve
body (1). Discard packings (10) and (11).
5. Remove elbow (2) from unloader valve body (1).
b. Installation
1. Apply antiseize tape to threads of elbow (2) and install on unloader valve body (1).
2. Install unloader valve spring (8), unloader cap (9), and new packings (10) and (11) in unloader valve
body (1).
3. Position unloader valve body (1) in air compressor head cover (5) and hold down.
4. Install unloader valve body (1) on air compressor head cover (5) with two washers (6) and screws (7).
5. Install air governor tube (4) on elbow (2) and tighten nut (3).
11-8
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