TM 5-3895-382-24
Every 250 Service Hours or 3 Months
You must read and understand the warnings and
instructions contained in the Safety Section of this
manual before performing any operation or maintenance
procedures.
Before proceeding with this maintenance, perform
previous maintenance interval requirements.
This maintenance is to be performed at the interval
specified in the Maintenance Schedule for your engine
model.
Scheduled Oil Sampling (S· O·S)
To compliment a good preventive maintenance program,
Caterpillar recommends using SOS at this scheduled
interval to monitor the condition of the engine oil and
maintenance requirements of your engine.
Obtain Sample
Each oil sample should be taken when the oil is warm
and
well
mixed
to
ensure
that
the
sample
is
representative of the oil in the crankcase. There are two
methods recommended to obtain SOS samples from
the engine crankcase.
Use the sampling valve, if installed on the engine,
for samples. The sample valve should be flushed
with oil to rinse the dirt and debris from the valve.
Use a sampling gun inserted into the sump.
NOTE: Refer to How to Take a Good Oil Sample,
PEHP6001, for a step-by-step explanation if
using this method of sampling crankcase oil.
Caterpillar recommends using one of the above
methods. If either of these methods are not possible,
then use a drain stream method when changing oil.
NOTE: When using the drain stream to obtain the oil
sample, do not sample from the beginning or
end of drain stream. The oil at the beginning
or end of the drain stream is not mixed well
enough to be representative of the oil in the
crankcase.
Consult your Caterpillar dealer for complete information
and assistance in establishing an S OS program for
your engine.
Oil Drain Intervals
Many conditions exist that may allow adjustment to the
normal oil change periods and can affect the selection of
an optimum oil change period. The fundamental
requirement in this decision must be to maintain the lube
oil in an acceptable condition that provides continual
engine protection. The quality and amount of oil
available is balanced against its ability to absorb
combustion by-products.
Due to manufacturing tolerances, engine application and
maintenance variation, all engines do not consume fuel
and oil at the same rate. The amount of fuel consumed
is in direct relation to the maximum oil change interval
selected.
The Maintenance Schedule assumes the use of
SUPERIOR QUALITY API CF-4 (minimum) performance
oil, which has sufficient TBN for fuels with less than
0.5% sulfur.
Maintenance Section
Every 250 Service Hours or 3 Months
1-71
