This article mainly introduces JCB excavator 3CX 4CX Changing the Coolant
WARNING!
The cooling system is pressurised when the coolant is
hot. Hot coolant will burn you. Make sure the engine is
cool before checking the coolant level or draining the
system.
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1 Make sure the park brake is engaged and the
transmission set to neutral. Lower the loader arms and
backhoe to the ground, switch OFF the engine and
remove the starter key.
2 Open the bonnet, see Engine Panels, Opening and
Closing the Bonnet.
3 Carefully loosen cap A. Let any pressure escape.
Remove the cap.
CAUTION!
Keep your face away from the drain hole when removing
the drain plug.
2-3-3-4
4 Remove drain plug C and let the coolant drain out.
Make sure the drain hole is not blocked.
5 Disconnect the radiator hose at D and allow the coolant
to drain. Flush the system using clean water.
6 Clean and refit plug C. Make sure it is secure.
Reconnect the radiator hose
7 Use the necessary mix of clean, soft water and
antifreeze, see Coolant Mixtures. Fill to the COLD/MIN
level on coolant reservoir B.
8 Start the engine and run at idle to circulate the coolant,
top up with coolant as necessary.
9 Refit the filler cap. Make sure it is tight.
10 Run the engine for a while, to raise the coolant to
working temperature and pressure. Stop the engine.
Check for leaks.
Note: Make sure the cab heater control is in the hot
position. This will ensure the coolant mixture circulates
through the entire cooling system.
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