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RADIATOR FAN SHROUD (M939/A1) REPLACEMENT cont'd
FAN AND FAN SHROUD (M939A2) MAINTENANCE cont'd

TM-9-2320-272-24-1 Truck 5-Ton 6x6 M939 M939A1 M939A2 Series Trucks (Diesel) Manual
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TM 9-2320-272-24-1
THIS TASK COVERS:
a. Removal
c. Installation
b. Inspection
INITIAL SETUP:
APPLICABLE MODELS
REFERENCES (TM}
M939A2
TM 9-2320-272-10
TM 9-2320-272-24P
TOOLS
EQUIPMENT CONDITION
General mechanic's tool kit (Appendix E, Item 1)
Torque wrench (Appendix E, Item 146)
Parking brake set (TM 9-2320-272-10).
Hood raised and secured (TM 9-2320-272-10).
MATERIALS/PARTS
Four locknuts (Appendix D, Item 299)
Four locknuts (Appendix D, Item 313)
Two locknuts (Appendix D, Item 278)
Two lockwashers (Appendix D, Item 360)
Two sets of isolators (Appendix D, Item 263)
Antiseize compound (Appendix C, Item 10)
1.
Remove two locknuts (24), snubbing washers (25), screws (13), and washers (14) from brackets (18)
and (23). Discard locknuts (24).
2.
Remove two sets of isolators (12) from brackets (23) and (18). Discard isolators (12).
3.
Straighten tabs on two lockwashers (20) and remove screws (21), lockwashers (20), bracket (23), and
spacer (19) from radiator (17). Let bracket (23) hang from attaching cables (22) on vehicle hood (1).
Discard lockwashers (20).
4.
Remove four locknuts (5), eight washers (6), and four screws (7) securing top half of shroud (2) to
bottom half of shroud (8). Discard locknuts (5).
6.
Remove five screws (4), six washers (3), two locknuts (16), and top half of shroud (2) from
radiator (17). Discard locknuts (16).
6.
Remove two screws (27) from fan mounting bracket (26), position fan drive pulley (28) with fan
clutch (29) so fan clutch holes (34) are aligned, and install two screws (27) in fan clutch holes (34).
7.
Remove six nuts (30), washers (31), and fan blade (32) from fan clutch (29).
8.
Remove five screws (10), seven washers (11), two locknuts (15), clip (9), and bottom half of
shroud (8) from radiator (17). Discard locknuts (15).
1.
Inspect fan (32) shrouds (2) and (8) for cracks and missing pieces.
2.
Lay fan (32) on flat surface. Ensure all blades of fan (32) contact the flat surface the same way.
3.
Inspect fan (32) for cracks, broken pieces, and loose anchorage and studs (33) for cracks or stripped
threads.
4.
Inspect all other parts (para. 2-15).
5.
Replace all parts failing inspection.
1.
Install bottom half of shroud (8) on radiator (17) with clip (9), five screws (10), seven washers (11),
and two new locknuts (15). Ensure clip (9) is mounted under correct screw (10).
3-188






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