Published 08-25-09, Control # 077-04 7-17
RT9130E SERVICE MANUAL POWER TRAIN
WATER COOLING SYSTEM
Description
The cooling system consists of a radiator, surge tank, engine
cooling circuit, charge air cooler circuit, the connecting hoses
and connecting tubes. Cooling system capacity is
approximately 34.1 liters (36 quarts). The radiator consists of
two sections; the top section is the charge air cooler, the
bottom section is the engine water cooler. The temperature
is controlled by a 83 °C (181 °F) thermostat located between
the top of the engine and the top of the radiator. At all times,
the antifreeze/coolant should be properly inhibited against
corrosion. It is recommended that a mixture of 50/50 blended
ethylene-glycol, low silicate, fully formulated, extended life
engine antifreeze/coolant mixture which does not require a
pre-charge of supplemental coolant additives (SCA) be used
for fill of heavy duty liquid cooled internal combustion
engines.
The crane is equipped with a cab hot water heater. Hot water
is supplied by the engine coolant system through a strainer
and two port water swivel to the cab heater. The strainer is a
cleanable type and is located on the left side of the
transmission by the rear engine/transmission mount. Refer
to Section 9 - LUBRICATION for service of the strainer.
Maintenance
General
The cooling system includes the radiator, surge tank,
thermostat, the fan, and water pump. Radiator hoses are
also included in this group.
The cooling system is often neglected because the effects or
damage that result from an improperly maintained system
usually occur gradually. The cooling system needs to be
maintained with the same attention as other systems.
The circulation of water through the cooling system relies
entirely upon the water pump. The water pump draws water
from the radiator and forces it through the water jacket and
cylinder head. There it accumulates heat and flows to the
right radiator tank. Then the water flows across through the
radiator core and is cooled by air from the fan. This process
of removing heat from water as it circulates holds the engine
to its efficient operating temperature.
The following paragraphs point out several facts about
cooling system components, the effects of cooling system
neglect, and procedures to be followed for cooling system
maintenance.
Effects of Cooling System Neglect
Whenever an engine does not perform at top efficiency, a
neglected cooling system may be at fault even though the
part directly responsible is not a part of the cooling system.
Most of these problems can be traced to overheating;
however, an engine that is running too cold can be just as
troublesome.
Overheating
An engine that is overheating may lead to troubles such as
the following:
1. Burned valves.
2. Pinging or knocking.
3. Excessive fuel consumption.
4. Poor lubrication - increased engine wear.
5. Sticking valves.
6. Short injector life.
7. Engine hot spots.
8. Need for higher grade fuel.
Overcooling
The following engine troubles result when an engine is
overcooled:
1. Excessive fuel consumption.
2. Sludge formation in crankcase.
3. Corrosive acids formed in crankcase.
4. Excessive fuel deposits in the exhaust system.
Rust Prevention
To keep engines operating at like new efficiency, all forms of
rust formation must be prevented. The formation of rust in
the cooling system is a result of the interaction of water, iron,
and oxygen, and can only be prevented by maintaining full
strength corrosion protection at all times.
For maximum rust, freeze, and boiling point protection, a 50/
50 blended, fully formulated extended life antifreeze/coolant
should be maintained at all times.
Engine Antifreeze/Coolant Fill Procedure
1. Fill the system with a 50/50 blended, fully formulated
extended life antifreeze/coolant. Fill to the bottom of the
surge tank filler neck. Fill slowly. Flow exceeding 19 l/
min (5 gpm) can give a false reading.
NOTE: If the engine coolant is changed, the coolant filters
must also be changed.
2. Wait one minute and recheck the antifreeze/coolant
level. Refill as necessary repeating step 1.
3. Run the engine for 5 minutes and recheck the
antifreeze/coolant level. Refill as necessary repeating
step 1. Refer to Section 9 - Lubrication.
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