Bobcat 331 - Cooling System (Cont’d)

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Operation & Maintenance Manual–44–
331/331E/334 Excavator
COOLING SYSTEM (Cont’d)
Replacing The Coolant
See the SERVICE SCHEDULE, Page 35 for the correct
service intervals.
Do not remove radiator cap when the engine is
hot. You can be seriously burned.
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When the engine is cool, loosen and remove the radiator
cap (Item 1) [A].
Put a hose on the drain valve at the bottom of the radiator.
Open the drain valve (Item 1) [B] and drain the coolant into
a container.
Put a hose on the drain valve on the engine block. Open the
drain valve (Item 1) [C] drain the coolant into a container.
After all the coolant is removed, close both drain valves.
Recycle or dispose of the used coolant in an
environmentally safe manner.
Mix the coolant in a separate container. (See FUEL,
COOLANT AND LUBRICANTS Chart, Page 81, for correct
capacity.)
NOTE: The cooling system is factory filled with
propylene glycol (purple color). DO NOT mix
propylene glycol with ethylene glycol.
Add premixed coolant; 47% water and 53% propylene
glycol to the recovery tank if the coolant level is low.
One gallon and one pint of propylene glycol mixed with one
gallon of water is the correct mixture of coolant to provide
a –34°F (–37°C) freeze protection. (See IMPORTANT,
Page 41.)
Use a refractometer to check the condition of propylene
glycol in your cooling system.
Add premixed coolant until the level is correct.
Run the engine until it is at operating temperature. Stop the
engine. Check the coolant level and add as needed. Be
sure the radiator cap is tight.
Add coolant to the recovery tank as needed.
Close the tailgate.
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