A
P–21190
Wear safety glasses to prevent eye injury when
any of the following conditions exist:
W–2019–1285
• When fluids are under pressure.
• Flying debris or loose material is present.
• Engine is running.
• Tools are being used.
B
P–21156
1
Operation & Maintenance Manual–43–
331/331E/334 Excavator
COOLING SYSTEM
Check the cooling system every day to prevent
over–heating, loss of performance or engine damage.
Cleaning The Cooling System
Open the tailgate.
Use low air pressure or water pressure to clean the radiator
and oil cooler [A]. Be careful not to damage fins when
cleaning.
Checking Coolant Level
Do not remove radiator cap when the engine is
hot. You can be seriously burned.
W–2070–1285
Open the tailgate.
Check the coolant level in the coolant recovery tank
(Item 1) [B].
The coolant level must be between the MIN and MAX
marks on the coolant recovery tank when the engine is
cold.
NOTE: The cooling system is factory filled with
propylene glycol (purple color). DO NOT mix
propylene glycol with ethylene glycol.
I–2124–0497
Always use the correct ratio of water to anti-
freeze.
Too much antifreeze reduces cooling system
efficiency and may cause serious premature
engine damage.
Too little antifreeze reduces the additives
which protect the internal engine compo-
nents; reduces the boiling point and freeze
protection of the system.
Always add a premixed solution. Adding full
strength concentrated coolant can cause seri-
ous premature engine damage.
AVOID ENGINE DAMAGE
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