. MAINTENANCE SERVICE PROCEDURE REPLACE FUEL MAIN FILTER CARTRIDGE WARNING (2) 5. Coat the packing surface of the filter cartridge with oil. 4 - 66 After th e engine has been oper ated, all parts are at high temperature, so do not replace the filter im mediately. Wait for all parts to cool down before starting th High pr essure is generated ins ide the engine fuel pipin g system When r eplacing the filter, wait for at least 30 seconds after stopping the engine to let the interna l pressure go down before replacin g the filter. Do not bring any open flame c NOTICE Genuin e Komatsu fuel filter ca rtridges use a special fi lter that has highly efficient filtering ability .
When replacing the filter cartridg e, always use a genuin e Komatsu part. The co mmon rail fuel injection system used on this m achine c onsists of more precise parts than the conventional injection pump a nd nozzle. If any p art other than a genuine Komatsu filter cartridg e is used, dust or dirt may get in and cause problems with the injection system. Always avoid using s ubstitute parts. When p erforming inspection o r maintenance of the fue l system , pay more attention than normal t o the entry of dirt. If dirt is stuck to any part, use fuel to w ash it off completely. Prepar e a container to catc Prepar 1. Close supply valve (1) of 2.
Set th e container to catch the fuel under the filte 3. By using a filter wr cartridg count erclockwise to remo