5: Maintenance 375, 375H, 400HH, 425, 425H T4F User Manual
02250223-036 R01
50 Subject to EAR, ECCN EAR99 and related export control restrictions.
The engine coolant type should follow these recom-
mended specifications:
• Organic acid technology (OAT).
• Pre
mixed coolant pH range of 8.0 to 9.5.
• Contains no silicates, phosphates, borates,
nitrates and amines.
• Solution states that it is formulated for use in
heavy duty diesel applications.
• Protects all standard metals within the cooling
system (i.e. brass, copper, steel, solder, cast
iron, and aluminum).
• Meets specification requirements of current
industry standards which include: ASTM D
3306, Cat EC-1.
• Meets or exceeds performance requirements of
current industry standards which include:
ASTM D 6210, Caterpillar H24A2 and H24C2.
If you are not sure of the coolant tha
t is installe
d originally or
want to change to a different type, the cooling system must
be cleaned with a commercial cleaning agent (such as CAT
Cooling System Cleaner p/n 4C-4611) and then completely
flushed and filled with water (preferably distilled) several
times to remove all traces of cleaner and old coolant.
Finally, fill the system with the recommended coolant using
only one brand/type. Cross-contamination, which is caused
by adding different types of engine coolants, may result in
the depletion or dropout of coolant additives; thus leaving
cooling system surfaces unprotected against corrosion.
Corrosion to radiator surfaces may reduce cooling effi-
ciency and radiator life expectancy. It is extremely impor-
tant to evacuate/purge all air within the cooling system
b
efore
replacing the radiator cap.
Engine coolant must not only maintain proper freeze pro-
tection levels but also maintain proper corrosion inhibitor
levels. Please conta
ct the coolant manufacture for specif-
ics on testing methods and suggested coolant mainte-
nance intervals.
5.4 Maintenance after initial 50
hours of operation
After the initial 50 hours of operation, the following main-
tenance actions are required to eliminate contaminants
from the system:
•
Clean the return line orifice and change the
strainer.
• C
hange the compressor fluid filter.
• Check the Engine Operator’s Manual for ser-
vice requirements.
• Check the fuel filter for water.
• Confirm that the sump cover bolts are tightened
to 160 lbf ft (215 N m).
5.5 Maintenance every 50 hours
• Inspect air filter elements and replace if neces-
sary.
• Check the fuel filter for water.
Table 5-1: Coolant service life
Coolant type Service life
Mobil Delvac EXTENDED
LIFE Coolant/Antifreeze
6 years/12,000 hours
1
Caterpillar ELC 6 years/12,000 hours
1
1
Using manufactures extender additive to system at 3 years or
6000 hours
WARNING
This engine is fitted with Selective Catalytic
Reduction (SCR) which utilizes Diesel Exhaust
Fluid (DEF) to maintain proper engine exhaust
emissions levels. Failure to maintain the DEF
level or attempting to fool the DEF system by
using unapproved DEF could induce the engine
into a derated state.
Never operate the compressor in a derated state.
Continuing to operate the compressor in a DEF-
induc
ed derated state will require the as
sistance
of a technician from the engine manufacturer
dealership to resolve the issue and may cause
significant damage to the compressor.
WARNING
Use only diesel exhaust fluid (DEF) that con-
forms to ISO-22241-1. THE DEF fill port is indi-
cate
d by a blue cap.
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