Symptom
Problem
Solution
Section
Low coolant level
Fill reserve tank to proper level.
Check system for leaks.
Water only for coolant
Replace with antifreeze.
Engine overloaded
Reduce ground speed.
Driving Forward
in Cab-Forward
Mode, page 127
Defective radiator cap
Replace cap.
Inspecting
Pressurized
Coolant Tank Cap
Dirty radiator screen
Clean screen.
Dirty radiator core
Clean radiator.
5.8.2 Cleaning
Cooler Module,
page 272
Cooling system dirty
Flush cooling system.
5.12.1 Changing
Engine Coolant,
page 298
Defective thermostat
Remove and check thermostat.
Defective temperature gauge
or sender
Check coolant temperature with
thermometer. Replace gauge if
necessary.
Engine overheats
Defective water pump
Contact Dealer.
Contact Dealer
Clogged or dirty air cleaner
Service air cleaner.
Cleaning Primary
Air Filter, page 283
Engine overloaded
Reduce ground speed.
Driving Forward
in Cab-Forward
Mode, page 127
Improper valve clearance
Engine out of time
Dirty injector nozzles
Contact Dealer.
Low engine temperature
Check thermostat.
Contact Dealer
High fuel
consumption
Improper type of fuel
Use proper fuel.
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Revision A
Summary of Contents for M1240
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