COOLING SYSTEM (CON’T) Figure 10-70-6 Replacing The Coolant (S/N 522311001 & Above) (Cont’d) Figure 10-70-5 1 1 P-32844 Check the coolant level (COLD) in the surge tank (Item 1) [Figure 10-70-6] when cool. P-32847 Add coolant to the tank as needed. Remove the lower radiator hose (Item 1) [Figure 10-70- 5] . Drain the coolant from the engine. After the coolant is removed, install the plug (Item 1) [Figure 10-70-4 on Page 10-70-2] and lower radiator hose (Item 1) [Figure 10-70-5] . Recycle or dispose of the used coolant in an environmentally safe manner. Mix the coolant in a separate container. NOTE: The excavator is factory filled with ethylene glycol coolant.
Add premixed coolant, 50% water and 50% ethylene glycol to the reservoir if the coolant level is low. One gallon (3,8 L) of ethylene glycol mixed with one gallon (3,8 L) of water is the correct mixture of coolant to provide a -34° F (-37° C) freeze protection. Use a refractometer to check the condition of ethylene glycol in your cooling system. Fill the radiator with the premixed coolant. Install the radiator cap. Run the engine until it is at operating temperature. Stop the engine. 442 Excavator 10-70-3 Service Manual