Maintenance - Section 40 OM4064 06/11
Page 40-2 Lubrication and Service
COOLING SYSTEM SERVICE
Check the coolant level sight gauge. 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 quick fill
system, the radiator cap must be removed before
adding coolant.
NOTE: Engine coolant must always be visible in the
sight gauge before truck operation.
1. With the engine and coolant at ambient
temperature, remove the radiator cap (2, Figure
40-2).
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..
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 antifreeze.
• Under concentration or over concentration of
Extended Service Additive (SCA).
• Use of antifreezes/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 antifreeze, 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 evolu-
tion/design, wheel motor service intervals may be unit
number and/or mine specific. Because of the wide vari-
ety of factors involved, it is necessary to consult your
area Komatsu representative for all wheel motor ser-
vice intervals and instructions. General intervals for oil
service and sampling are listed in the interval charts.
FIGURE 40-2. COOLING SYSTEM SERVICE
1. Sight Gauge 2. Radiator Cap
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