Komatsu PC400LC-5 Operation & Maintenance Manual page 208

24. SERVICE PROCEDURE
24.7.5 REPLACE CORROSION RESISTOR CARTRIDGE
If the engine has been operated, all parts will be at a high
Always wait for the engine and other parts to cool down.
Prepare the following.
l Container to catch drained coolant
l Filter wrench
1. Close valves 0.
2. Set a container to catch the coolant under the cartridge.
3. Using a filter wrench, remove cartridge 0.
4. Clean the filter holder, coat the packing surface and thread of the
new cartridge with engine oil, then install it to the filter holder.
I ,
5. When installing, tighten until the packing surface contacts the
seal surface of the filter holder, then tighten it up 2/3 of a turn.
If the filter cartridge is tightened too far, the packing will be
damaged and this will lead to leakage of coolant. If the filter
cartridge is too loose, coolant will also leak from the packing, so
always tighten to the correct amount.
6. Open valves 0.
7. After replacing the cartridge, start the engine and check for any
leakage of water from the filter seal surface. If there is any water
leakage, check if the cartridge is tightened properly.
3-64