Komatsu PC18MR-3, Operation & Maintenance Manual

Page: 249 / 284

MAINTENANCE PROCEDURES
WEAM012101
247
4.9.9.b CHANGING THE COOLANT
CAUTION
q
The coolant must be changed every 2000 hours of operation or every 2 years, whichever occurs first.
WARNING
q
Soon after the machine has been stopped the coolant is very hot and under pressure and it may cause
serious burns; let the engine cool down until it reaches approximately 40÷45°C before changing the
coolant.
q
Slowly loosen the radiator cap, in order to release any residual pressure.
q
Oils, filters, the coolant and the battery are considered special waste and must be collected and dis-
posed of according to the regulations in force.
IMPORTANT
q
The change of the permanent coolant does not require any washing cycle for descaling the circuit.
1. Remove the screws (1) and remove the radiator cap guard
located on the right hand side of the machine.
2. Open the engine hood and the radiator cover. For further
details, see paragraphs "3.2.6 ENGINE HOOD" and "3.2.7
RADIATOR COVER".
3. Loosen and remove the upper cap (2) of the radiator.
4. Open the radiator drain valve (3), remove the drain plug (4)
on the engine block and let the fluid flow out, gathering it in a
container with suitable capacity. Drain the coolant tank (5)
while the fluid flows out.
5. Close the drain valve (3), put back the plug (4) on the engine
block and fill the radiator with new fluid (see "4.4 FUEL,
COOLANT AND LUBRICANTS").
6. Start the engine and let it run at high idling speed for a few
minutes; check the level again and top up before putting back
the upper cap (2).