TM 10-4330-236-13&P
2-6.
OPERATING PROCEDURES - continued.
f. Heat Adjusting. (Refer to Figure 2-19). When the defrost shroud (1) is used to prevent water freezing in the
filter-separator sump, heating from the system pump is adjusted by positioning the defrost door (2) on the shroud.
WARNING
To avoid bums, wear hand protection when adjusting defrost door. The door and shroud may be
very hot.
(1)
The adjustment bracket (3) on shroud (1) provides four positions for ad
justing the defrost door (2).
CAUTION
Never fully close the defrost door during system operation This would apply excessive back
pressure to the pump assembly exhaust, which could result in engine damage.
(2)
Adjust heat by moving the bar (4) attached to the defrost door (2) to the selected notch. The first notch
(fully open) position on the adjustment bracket (3) provides the least heat and the fourth notch (fully
closed) position provides the most beat.
Figure 2-19. Heat Adjusting.
2-34
