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MAINTENANCE
SECTION 8
Page
19
COOLING SYSTEM
The radiator cap is equipped with a pressure-reliefvalve. The
relief valve keepsthe system pressurizedat approximately six
to eight psi.
THERMOSTATS
The thermostats have two functions; gain rapid enginewarm-
up; control coolant temperature. Engine overheating is some-
times due to an inoperative thermostat.
Referto your Cummins Engine Operator's Manual for thermo-
stat checking procedure.
ENGINE OIL COOLER
The engine oil cooler is mounted on the right side of the en-
gine and is connected to the enginecooling system.
The cooler has two functions; gain rapid engineoil warm-up;
control engineoil temperature during operation.
TRANSMISSION SYSTEM AND
HYDRAULIC SYSTEM OIL COOLERS
The transmission system and hydraulic system oil coolers are
in a split unit mounted to the rear of the radiator. The large
section on the left side cools the transmission and torque
converter system. The small section on the right cools the
hydraulic system oil.
WATER PUMP
Refer to your Cummins Engine Operator's Manual for main-
tenanceto be performed on the water pump.
PRECAUTIONS
ELECTRICAL SYSTEM
Before working on any part of the electrical system, turn the
electrical system master switch "OF F" (1IIust. 25).
lIIust.25
Electrical System Master Switch.
All terminals must be clean and fastened securely. Never
paint electrical connections or the generator. Repair or replace
all broken wires immediately.
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CAUTION: WHEN INSTALLING BATTER-
IES, BE SURE TO CONNECT THE GROUND
CABLE TO THE NEGATIVE TERMINAL.
WHEN CONNECTING A BOOSTER BATTERY OR
BATTERY CHARGER, MAKE CERTAIN TO CON-
NECT THE NEGATIVE TERMINAL TO THE NEGA-
TIVE TERMINAL AND THE POSITIVE TERMINAL
TO THE POSITIVE TERMINAL.
DO NOT SHORT
ACROSS OR GROUND ANY TERMINALS OF THE
ALTERNATOR.
ALTERNATOR
Refer to vour Cummins Engine Operator's Manual for all
maintenanceto be performed on the alternator.
REGULATOR
The regulator is adjusted and sealed by the manufacturer.
If the regulator fails to operate properly, consult your
authorized Cummins Engine dealer.
CRANKING MOTOR
Refer to your Cummins Engine Operator's Manual for all
maintenanceto be performed on the cranking motor.
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