Section VII. ACCESSORIES MAINTENANCE

TM 9-2320-285-24-2

Section VII. ACCESSORIES MAINTENANCE

This section contains the information you will need to maintain the cab heater.

It gives you instructions on how to troubleshoot problems and repair or replace the components that are

within the scope of direct support maintenance.

Para

Troubleshooting Symptom Index ................................................................................................... 3-36

Heater Troubleshooting ................................................................................................................. 3-37

Heater Maintenance ...................................................................................................................... 3-38

3-36. TROUBLESHOOTING SYMPTOM INDEX

Para/Malfunction

Page

HEATER

Cab heater doesn't heat cab .............................................................................................

Fresh air door will not open or close .................................................................................

Windshield will not defrost .................................................................................................

3-37. HEATER TROUBLESHOOTING

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1. CAB HEATER DOESN'T HEAT CAB

Step 1. Remove motor (para 3-38).

Connect 12 Vdc power source to motor electrical leads.

Check if motor shaft rotates.

a. If motor shaft does not rotate, replace motor (para 3-38).

b. If motor shaft rotates, proceed to step 2 below.

Step 2. Check heater core for leaks, cracks, distortion, or obstructions.

a. If heater core is leaking, cracked, or distorted, replace (para 3-38); if obstructed, clean (para 3-38).

b. If heater core is not leaking, cracked, distorted, or obstructed, proceed to step 3 below.

Step 3. Check blower wheel for cracks, distortion, obstructions.

Check if setscrew is loose or missing.

a. If obstructions are found, remove; if blower wheel is cracked, or distorted, replace (para 3-38).

b. If setscrew is loose or missing, replace (para 3-38).

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