TM-5-3805-254-14-P-1
TRUCK, DUMP, 20 TON, 6X4, ON-OFF HIGHWAY 71,000 GVW, IHC MODEL F-5070 (CCE)
TECHNICAL MANUAL; OPERATOR'S, ORGANIZATIONAL, DIRECT SUPPORT, GENERAL SUPPORT AND DEPOT MAINTENANCE MANUAL (INCLUDING REPAIR PARTS INFORMATION AND SUPPLEMENTAL MAINTENANCE INSTRUCTIONS)
AUGUST 1980
TM-5-3805-254-14-P-1 - Page 16 of 590
OPERATION
HEATING, VENTILATING AND DEFROSTING
HEATING To use as a fresh air heater, move "AIR"
inlet control lever to "FRESH".
Adjust temperature
"HTR" (HEAT) lever as required to give the desired
degree of heat.
Full right "HOT" position provides
maximum heat.
Move "AIR OUTLETS" control lever as
desired to control air flow.
For MAXIMUM AIR FLOW,
move both "FAN" switches to "HI".
Switches can be
operated in any speed combination.
Fresh Air Heat
To use as a recirculating type heater, operate heater
controls in normal manner and move "AIR" inlet control
lever to "RECIRC".
Recirculating Heat
DEFROSTING
To obtain maximum defrosting, move "HTR" lever to
"HOT".
Place "AIR OUTLETS" lever at "DEF" and "AIR"
lever to "FRESH".
Adjust blower speeds to provide
desired air flow.
To put all air on windshield, move "AIR OUTLETS"
control lever to "DEF", close floor outlet.
Defrost
CAUTION:
To clear the system of humid air,
operate blowers for 30 seconds at "Hi" speed before
moving "AIR OUTLETS" lever to "DEF".
This will minimize rapid fogging of the glass, which
can occur if humid air is blown onto a cool windshield.
To improve defroster efficiency, remove ice and/or
snow from glass area.
FRESH AIR VENTILATION To permit fresh air to
enter directly into the cab, push in air door control (left
ventilator).
To direct fresh air through the heater for distribution
through the cab air outlets, place the control panel
"HTR" lever in the "OFF" position.
Move the "AIR" lever
to "FRESH".
Move "AIR OUTLETS" lever to direct air
stream as desired.
Adjust blower speed and air
registers for desired air flow.
Blowers may be operated
individually or simultaneously in any available speed
combination.
ENGINE BRAKE CONTROL OPERATION
After the engine has reached normal operating
temperature and before starting a trip, position the
manual control switch on the instrument panel to "ON."
When the vehicle is in motion, the engine brake
control is in operation when the operator's foot is
removed from the accelerator pedal.
The engine brake may be used in general whenever
decelerating the vehicle is required, such as, descending
grades, city traffic or approaching traffic lights.
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