2-30. OPERATE IN EXTREME HEAT (Cont).
(11) Severe heat increases pressure In closed pressurized systems, such as hydraulic system and cooling
system, and Increases the volume of liquids. Ensure that working pressure Is within safety limits and use
caution when removing hydraulic fill cap and, if necessary, radiator fill cap.
(12) Try to keep forklift truck in shade, or at least partially covered, to lessen heat damage. Ensure that all window
surfaces In cab area are covered.
(13) When operating forklift truck in temperatures above 100°F (380C), extra care must be taken to prevent
overheating of engine and transmission. Temperatures may be between 10 °F
to 20 °F
(-12 °C to -7°C) hotter
than normal. Monitor engine coolant high temperature indicator and transmission oil temperature gage. If the
temperatures continue to rise, put forklift truck in neutral and rev up engine to approximately 1200 rpm until
indicator goes out and gage drops back to a more normal operating temperature.
(14) Operate In lowest gear range allowable for the Job you are doing. Keep load lifted as low as possible to avoid
overloading the forklift.
(15) Do not open engine access doors with the engine running to attempt to cool down the engine. Opening these
doors interferes with proper airflow and may Increase heating or damage the engine.
b. Battery Checks.
(1) Batteries do not hold their charges well in extreme heat. Battery specific gravity should be adjusted by Unit
Maintenance for the expected temperatures, and ensure that only distilled water is used in batteries.
(2) Have Unit Maintenance set the voltage regulator at the appropriate specification for your area.
(3) Monitor charging system closely to ensure that batteries are not overcharging or undercharging.
(4) Make sure that battery air vents are kept clean.
(5) If forklift truck is not to be used for two days, remove batteries and store In a cool place.
c. Cab Operations.
(1) Ensure that sufficient air is kept moving by use of defroster fan (see paragraph 2-22).
(2) Operator fatigue will be greater during extreme heat; therefore, frequent operator changes or rest periods
should be observed.