TM 9-2320-280-20-3
11-190. HEATER REPLACEMENT (M997, M997A1, M997A2)
This task covers:
a. Removal
b. Installation
INITIAL SETUP:
Applicable Models
M997, M997A1, M997A2
Tools
General mechanic’s tool kit:
automotive (Appendix B, Item 1)
Personnel Required
One mechanic
One assistant
Manual References
TM 9-2320-280-24P
Equipment Condition
l Blower housing open (para. 11-198).
l Battery ground cable disconnected (para. 4-73).
General Safety Instructions
Diesel fuel is highly flammable. Do not perform
this procedure near fire, flames, or sparks.
WARNING
Diesel fuel is highly flammable. Do not perform this procedure
near fire, flames, or sparks. Severe injury or death may result.
NOTE
l Have drainage container ready to catch fuel.
l Cover or plug all open connections immediately after
disconnection to prevent contamination. Remove all covers or
plugs prior to connection.
1. Disconnect plug (11) from heater receptacle (12).
2. Loosen clamp (8) and disconnect hose (9) from heater outlet (7).
3. Disconnect fuel line (13) from heater (14) and allow fuel to drain into container.
4. Remove two clamps (2) from heater (14) and mounting brackets (4).
5. Turn two dzus fasteners (16) and remove cover (15) from heater (14).
6. Remove heater (14) by lifting rear of heater (14) up and pulling heater (14) out from exhaust pipe (6)
and sliding heater (14) to the right and out of intake assembly (1).
7. Inspect seal (5) for presence and damage. Replace if missing or damaged.
8. Remove four screws (10) and outlet (7) from heater (14).
I
b. Installation
1. Install outlet (7) on heater (14) with four screws (10).
2. Install two clamps (2) on mounting brackets (4).
3. Install heater (14) on mounting brackets (4), ensuring heater exhaust outlet (3) is installed into
exhaust pipe (6), and clamps (2) are wrapped around heater (14).
4. Slide heater (14) into intake assembly (1) opening and on mounting brackets (4) with two clamps (2).
5. Connect fuel line (13) to heater (14).
6. Connect hose (9) to heater outlet (7) and tighten clamp (8).
7. Connect plug (11) to heater receptacle (12).
8. Install cover (15) on heater (14) with two dzus fasteners (16).
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