TM 5-2420-230-10
The IHMEE is equipped with an HVAC system that is capable of heating, cooling, and pressurizing the cab.
The cab heating system consists of a heater core (1) inside the cab A/C control unit (2), an auxiliary defroster (2.1), the
engine (3), and the radiator (4). Hot coolant from the engine (3) flows to the auxiliary defroster (2.1) and the cab A/C control
unit (2) before returning to the radiator (4). The cab air pressurizer (5) blows air through the heater core (1), extracting heat
from the coolant to warm the cab. The auxiliary defroster (2.1) blows internal cabin air through its internal heater core (5.1) to
defrost the windshield.
The cab cooling system consists of an evaporator (6) inside the cab A/C control unit (2), the A/C compressor (7) mounted on
the engine (3), the A/C condenser (8), and the dryer (9). R-134a refrigerant is pressurized by the A/C compressor (7) and then
converted to a high-pressure liquid state by the A/C condenser (8). Liquid from the A/C condenser (8) passes through the
dryer (9), then to a thermal expansion valve (10), which meters the refrigerant to the evaporator (6). As expansion takes place
within the evaporator (6), heat is absorbed, cooling and dehumidifying the air that the cab air pressurizer (5) blows through the
evaporator (6).
In both heating and cooling, the air feeding into the cab A/C control unit (2) enters the cab through the A/C precleaner (11) and
the cab air pressurizer (5), which also contains an air filter.
There are two front and two rear steel, two-piece, bolt-together, 24 x 10.00 wheels (1) with 14.00 R24 tubeless, steel radial
tires (2). One spare tire (3) can be mounted to the backhoe bucket (4). All five tires have a run-flat insert that allows the
IHMEE to be driven a limited distance on one or two flat tires.
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