TM 10-3950-672-10
SECTION 5
OPERATING INSTRUCTIONS
5-1.
CONTROLS AND INDICATORS.
NOTE
The following paragraphs describe the controls and indicators located in the cab. The numbers in
parentheses ( ) represent the index number from Figure 5-1.
5-1.1
Engine Controls and Indicators.
a. Converter Oil Temperature Gauge. The converter oil temperature (OIL TEMP) gauge (34) located on the top
left side of the main control panel.
The gauge indicates the temperature of the transmission oil on a dual scale calibrated from 140to 320 (60to
F
160 ). The gauge receives a signal from a temperature sending unit in the oil line at the converter. The gauge
C
has a green scaled area indicating acceptable operation temperatures and a red scaled area indicating excessive
temperature.
b. Engine Oil Pressure Gauge. The engine oil pressure (OIL PRESS) gauge (36) is located on the top left side of
the main control panel. The gauge indicates the engine oil pressure on a dual scale calibrated from 0 to 100 psi
(0 to 690 kPa). Normal indication at idle is 10 psi (70 kPa), at high idle is 35 psi (241 kPa), and at maximum
governed speed is 85 psi (586 kPa). The gauge receives its signal from an oil pressure sending unit.
c. Engine Coolant Temperature Gauge. The engine coolant temperature (WATER TEMP) gauge (35) is located
on the top left side of the main control panel. The gauge receives a signal from a temperature sending unit in
the engine cooling system. The gauge has a green scaled area indicating acceptable operating temperatures [up
to 210 (99 )] and a red scaled area indicating excessive temperature.
F
C
d. Fuel Quantity Gauge. The FUEL quantity gauge (32) is located on the bottom left side of the main control
panel. The gauge indicates the quantity of fuel in the tank and has a scale calibrated from 0 to 4/4. The fuel
quantity gauge receives a signal from a sending unit in the fuel tank.
e. Ignition Switch. The IGNITION switch (28) is located on the left side of the main control panel. It is a key-
operated switch with four positions; ACC, OFF, ON, and START. With the switch in the OFF position, all
electrical power is off. Positioning the switch to ACC energizes all electrical components. Positioning the switch
to ON is the same as ACC. Placing the switch to START energizes the starter relay which in turn energizes the
cranking motor solenoid and cranks the engine for starting. Releasing the switch will spring return it to ON. To
shut down the engine, place the switch to OFF.
5-1
