Structural Maintenance
149
Plastic Defrost Damper
These units use a plastic defrost damper blade
instead of the aluminum defrost damper blade
previously used in self powered truck units. The
main difference other than the damper blade itself
is the hardware on the ends of the damper blade.
The plastic damper blade uses a blade pivot on
each end. The aluminum damper blade uses a
blade rod, a washer, and a damper bushing on
each end.
The blade pivots of the ends of the plastic damper
blade are not adjustable. However, the position of
the damper can be adjusted if necessary by
adjusting the position of the eye bolt in the
damper solenoid. Check the damper during
scheduled maintenance inspections for wear and
sealing the air flow.
1. Blade Pivots 4. Damper Solenoid
2. Springs 5. Damper Solenoid Rod
3. Plastic Damper Blade 6. Center Damper Blade Clamp
Figure 228: Plastic Defrost Damper Blade Components
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