
135
WEBM1000 Maintenance Section (D6T LGP (OEM))
Cooling System Water Temperature Regulator - Replace
Testing the coolant can be done at your Caterpillar
dealer. Caterpillar S·O·S Coolant Analysis is the best
way to monitor the condition of your coolant and
your cooling system. S·O·S Coolant Analysis is a
program that is based on periodic samples. See
Operation and Maintenance Manual, SEBU6250,
“Caterpillar Machine Fluid
Recommendations”“S.O.S Coolant Analysis” for
more information.
Perform a Coolant Analysis (Level 2) at initial 500
ho
urs for syst
ems that contain extended life coolant
(ELC). Perform the analysis yearly after the initial 500
hours.
166
Illustration 166
Location of coolant sampling port
1. Park the machine on a hard, level surface. Set
the engine at low idle speed.
2. Open the left side engine compartment. Remove
the prot
ective cap from the sampling valve.
3. Obtain a sample. For additional information
about
coolant analysis, see Special Publication,
SEBU6250 “Caterpillar Machine Fluids
Recommendations” or consult your Caterpillar
dealer.
4. Repla
ce the protective cap. Close the left side
engi
ne compartment.
Submit the sample for
Level 2 analysis.
Cooling System Water
Temperature Regulator -
Replace
NOTICE
Care must be taken to ensure that fluids are
contained du
ring performance of inspection,
maintenance, testing, adjusting and repair of the
product. Be prepared to collect the fluid with suitable
containers before opening any compartment or
disassembling any component containing fluids.
Refer to Special Publication, NENG2500 “C
aterpillar
Deale
r Service Tool Catalog” for tools and supplies
suitable to collect and contain fluids on Caterpillar
products.
Dispose of all fluids according to local regulations
and mandates.
Replace the thermostat on a regular basis per the
maintenance interval schedule. This action reduces
the chance of unscheduled downtime and of
problems with the cooling system.
A new thermostat should be installed after the
coo
ling syste
m has been cleaned. Install the
thermostat while the cooling system is drained or
while the cooling system coolant is drained to a level
that is below the thermostat housing.
NOTICE
Failure to replace the engine's thermostat on a
regularly sch
eduled basis could cause severe engine
damage.
Note: If you are only installing a new thermostat,
drain the cooling system coolant to a level that is
below the thermostat housing.
1. Ope
n the right engine compartment.
167
Illustration 167