. MAINTENANCE SERVICE PROCEDURE REPLACE FUEL PREFILTER CARTRIDGE WARNING (2) counterclockwise to remove it. 4 - 64 After th e engine has been operated , all parts are at high temperature, so do not replace the filter imm ediately. Wait for all parts to cool down before starting the o High pr essure is generated inside the engine fuel piping 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 close NOTICE Genuin e Komatsu fuel filter cartrid ges use a special filter that has highly efficient filtering ability .
When replacing the filter cartridg e, always use a genuine Ko matsu part. The co mmon rail fuel injection sys tem used on this machine c onsists of more precise parts than the conventional injection pump a nd nozzle. If any p art other than a genuine Ko matsu filter cartridge is used, dust or dirt may get in and cause p roblems with the injection system. Always avoid using subst itute parts. When p erforming inspection or ma intenance of the fuel system , pay more attention than normal t o the entry of dirt. If dirt is stuck to any part, use fuel to wash it off completely. Prepar e a container to catch th Prepar 1. Close supply valve (1) of the 2. Set th e container to catch the 3.
Remo ve transparent cup (3) f rom the filter and inspect it broke n or damaged, replace i 4. By using a filter wrenc