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Lubrication and Service - Section 40
Page 40-2
COOLING SYSTEM SERVICE
heck coolant level sight gauge (1, Figure 40-2). If
coolant cannot be seen in the sight gauge, add
coolant to the system before truck operation. Refer to
the procedure below for the proper filling procedure.
Radiator Filling Procedure
The cooling system is pressurized due to thermal
expansion of coolant. Do not remove the radiator
cap while the engine and coolant are hot. Severe
burns may result.
NOTE: If coolant is added using the Wiggins service
center, the radiator cap must still be removed before
adding coolant.
Engine coolant must always be visible in the sight
gauge before truck operation.
1. With the engine and coolant at ambient
temperature, remove radiator cap (2).
2. Fill the radiator with the proper coolant mixture
until coolant is visible in the sight gauge.
3. Install the radiator cap.
4. Run the engine for five minutes, then check the
coolant level.
5. If coolant is not visible in the sight gauge,
repeat Steps 1 - 4. Any excess coolant will be
discharged through the vent hose after the
engine reaches normal operating temperature.
FIGURE 40-2. COOLING SYSTEM SERVICE
1. Sight Gauge
2. Radiator Cap
Coolant Specifications
• For ambient temperatures of -32° C (-25° F) and
above, use a standard 50/50 anti-freeze-to-water
mixture.
• For arctic climates with ambient temperatures
between -32° C (-25° F) and -54° C (-65° F), use
a 60/40 anti-freeze-to-water mixture.
NOTE: Do not use propylene glycol coolant in arctic
climates. Only use ethylene glycol coolants.
Unacceptable Practices
• Use of high-silicate anti-freeze.
• Under concentration or over concentration of
Extended Service Additive (SCA).
• Use of anti-freezes/coolants that are not fully
formulated for extended service intervals.
• Use of sealing additives (stop-leak) in the cooling
system.
• Use of soluble oils in the cooling system.
• Use of poor-quality water. See the engine
manufacturer's specifications for water quality
requirements.
• Use of anti-freeze, Extended Service Additive
(SCA) or coolant filter(s) that do not meet the
engine manufacturer's specifications.
• Use of Treated Water coolant.
• Use of coolants with less than 40 percent
antifreeze.
WHEEL MOTOR SERVICE
Due to differences in gear ratio and component
evolution/design, wheel motor service intervals may
be unit number and/or mine specific. Because of the
wide variety of factors involved, it is necessary to
consult your area Komatsu representative for all
wheel motor service intervals and instructions.
General intervals for oil service and sampling are
listed in the interval charts.
7/11 OM4056
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