Structural Maintenance
120
Defrost Damper
Check the damper during scheduled maintenance
inspections for shaft wear, end play and sealing
against air flow.
Position the damper so that the air flow is stopped
top and bottom with the solenoid plunger
bottomed.
1. If the damper does not close completely:
a. Energize damper solenoid by placing a
jumper wire from 12 Vdc to No. 29 wire in
the evaporator harness.
b. If damper blade closes, proceed to step 2.
If not, proceed to step 1.c.
c. Remove the jumper wire, loosen the
evaporator outlet adjustment angle and
move so when energized, the damper will
close.
d. Retighten the adjustment angle and repeat
steps a. and b.
2. If the damper blade does not seal evenly along
full width of blade:
a. Loosen the damper bearing blocks.
b. Manually close the damper so the blade
makes contact at the top and bottom of the
funnel, the full width of the blade.
c. Retighten damper bearing blocks.
d. Lube bearing block and shaft with low
temperature grease (see Tool Catalog).
1
2
AEA924
Incorrect
Incorrect
Correct
1.
Move Angle Down
2.
Move Angle Up
Figure 77: Defrost Damper Adjustment
Summary of Contents for 919180
Page 4: ...4...
Page 10: ...Table of Contents 10...
Page 32: ...Unit Description 32 Unit Photographs Figure 3 Front View Figure 4 Back View AJA584 AJA585...
Page 33: ...Unit Description 33 Figure 5 Left Side View Figure 6 Right Side View AJA586 AJA58...
Page 35: ...Unit Description 35 Figure 8 North American Power Receptacle Box AJA58...
Page 38: ...Unit Description 38...
Page 58: ...Electrical Maintenance 58...
Page 66: ...Engine Maintenance 66 Figure 37 Fuel and Oil System Components...
Page 84: ...Engine Maintenance 84...
Page 96: ...Refrigeration Maintenance 96...
Page 118: ...Hilliard Clutch Maintenance 118...
Page 136: ...Cycle Diagrams 136...
Page 140: ...Wiring and Schematic Diagrams Index 140...
Page 141: ...141 Truck S Model SR 30 Schematic Diagram Page 1 of 2...
Page 142: ...142 Truck S Model SR 30 Schematic Diagram Page 2 of 2...
Page 143: ...143 Truck S Model 30 Units with P T Wiring Diagram Page 1 of 2...
Page 144: ...144 Truck S Model 30 Units with P T Wiring Diagram Page 2 of 2...
Page 145: ...145 Truck S Model 50 Schematic Diagram Page 1 of 2...
Page 146: ...146 Truck S Model 50 Schematic Diagram Page 2 of 2...
Page 147: ...147 Truck S Model 50 Units with P T Wiring Diagram Page 1 of 2...
Page 148: ...148 Truck S Model 50 Units with P T Wiring Diagram Page 2 of 2...