TM-9-2320-285-24-1

TRUCK TRACTOR, YARD TYPE, 43,500 LB GVW, DED, 4X2, ARMY MODEL M878A1

TECHNICAL MANUAL; ORGANIZATIONAL, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL

OCTOBER 1985

TM-9-2320-285-24-1 - Page 786 of 987

TM 9-2320-285-24-1

2-68.

HEATERS TROUBLESHOOTING (CONT)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

2.

FRESH AIR DOOR WILL NOT OPEN OR CLOSE (Cont)

Step 2.

Check if fresh air control cable engages fresh air door bellcrank.

a.

If fresh air control cable does not engage fresh air door bellcrank, reconnect (para 2-73b).

b.

If fresh air control cable engages fresh air door bellcrank, go to step 3 below.

Step 3.

Check if fresh air control cable is cracked, frayed, or kinked.

a.

If fresh air control cable is cracked, frayed, or kinked, replace (para 2-73b).

b.

If fresh air control cable is not cracked, frayed, or kinked, notify direct support maintenance.

3.

CAB HEATER DOESN’T HEAT CAB

Step 1.

Check if temperature control cable is pulled out fully.

a.

If temperature control cable is not pulled out fully, pull out

fully to allow maximum flow of hot water to cab heater.

b.

If temperature control cable is pulled out fully, go to step 2

below.

Step 2.

Check if temperature control cable engages temperature valve lever.

a.

If temperature control cable does not engage temperature valve lever, reconnect (para 2-73b).

b.

If temperature control cable engages temperature valve lever, go to step 3 below.

Step 3.

Check if temperature control cable is cracked, frayed, or kinked.

a.

If temperature control cable is cracked, frayed, or kinked, replace (para 2-73b).

b.

If temperature control cable is not cracked, frayed, or kinked, go to step 4 below.

2-763