RD 27 Maintenance
wc_tx000815gb.fm 91
5.37 Changing the Cooling System Coolant
Prerequisites
Machine shut down
Engine cool
When
Every 12,000 hours of service or 6 years
l
Draining
Follow the procedure below to drain the cooling system coolant.
1. Open the engine compartment.
2. Open the radiator filler cap (a) slowly in order to relieve the pressure. Remove
the filler cap after the pressure has been released.
3. Place a suitable container underneath the machine.
4. Open the drain valve (b) on the bottom of the radiator and allow the coolant to
drain through the attached hose into a suitable container.
Cleaning
Follow the procedure below to clean the cooling system.
1. Close the radiator drain valve.
2. Fill the coolant system with clean water and 6–10% coolant system cleaner.
3. Install the radiator filler cap.
4. Start the engine. Run the engine for 90 minutes.
5. Stop the engine. Allow the cooling system to completely cool.
6. Open the radiator filler cap.
7. Place a suitable container underneath the machine.
8. Open the drain valve (b) on the bottom of the radiator and allow the cleaner to
drain into a suitable container.
Note: Collect, store and dispose of all used coolant in accordance with current
environmental protection regulations.
WARNING
Burn hazard. At operating temperature, engine coolant is hot and under pressure. It
can cause severe personal injury.
f Check the coolant level only after the engine has been shut down and is cool.
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