open. Upon reaching their full-open position the louvers
set the travel-limit switches to their opposite position,
deactivating the louver motors. Louver operation at
shutdown is exactly the same except that the motors
operate in a reverse direction and 24V DC is applied
through the normally closed contacts of the deenergized
louver control relays.
The shutter assembly (there are two) is automatically
operated by a hydraulic control assembly (figure 5-5)
through which coolant is allowed to flow. With the
engine cold, the spring-loaded shutters are held closed
by the control assembly. As the coolant warms, the
hydraulic medium (wax) melts. The control assembly
relaxes its hold and allows the shutters to open. There
is a direct correlation between coolant temperature and
the extent of shutter opening.
INSTALLATION. The housing kit is installed by
mounting its component sections directly onto the base
assembly and the support frame assembly in the
following sequence: door and shutter assembly, left
side, front (radiator end), right side, rear, top, and
electrical harness. Installation/assembly is normally
performed at the Direct Support Maintenance level.
LUBRICATION. The housing kit door and
shutter assemblies, access doors, and all moving parts
require lubrication in accordance with the lubrication
order LO5-6115-593-12. Army personnel shall refer to
DA PAM 310-4 and Marine Corps personnel to SL-1-3 to
ensure that the latest edition of the lubrication order
(LO) us being used.
PREVENTIVE MAINTENANCE CHECKS AND
SERVICES (A, N, MC). To ensure that the housing kit
is always ready for operation, inspect systematically so
that defects may be discovered and corrected before
they result in serious damage or failure. Perform the
accordance with table 5-7. Air Force users shall refer to
the applicable inspection manuals and work card sets in
requirements and table 5-7 for detailed procedures.
Marine Corps users shall refer to the current issue of TM
Table 5-8 contains information for locating and
correcting operating troubles which may develop in the
generator set when equipped with the housing kit. Each
malfunction is followed by a list of tests or inspections to
determine probable causes and corrective actions.
Perform the tests or inspections and corrective actions
in the order listed. Any trouble beyond the scope of
organizational maintenance shall be referred to the next
higher level of maintenance.
ORGANIZATIONAL MAINTENANCE OF THE
a. Inspection. (See figure 5-5.)
(1) Inspect the louvers, door panels, and front
grille for cracks, loose mounting, loose or
missing hardware, rust or corrosion.
(2) Inspect the weather stripping around each
door assembly for peeling of adhesive
backing, excessive wear, rot, or damage.
(3) Inspect all connectors in the wiring harness
for damaged threads, and bent, loose, or
missing pins. Check all connections for
security and condition. Check all wiring for
defective or worn insulation.
Set MAINTENANCE LOCKOUT switch to
LOCKOUT. Disconnect negative cable
from batteries. Remove external power
by opening CB101 (120V RECEPTACLE
BREAKER). Load terminals of generator
set circuit breaker (CB2) may still be
energized with the bus voltage.
b. Test. Refer to FO-17 and perform a continuity
check of the harness assembly using an
ohmmeter between connecting points in the
wiring harness. Check for short circuits between
connector pins of the same receptacle, plug, or