6. MAINTENANCE OF MAJOR COMPONENTS 6.1. Fuel Injection Pump 6.1.1. General information of fuel system The fuel system consists of the fuel tank, injection pump, injection nozzle, fuel filter, and fuel lines such as pipes and hoses necessary to connect those components. 5 2 1 4 3 7 1a 8 12 10 9 11 EQM4011I 1. Fuel filter 7. Fuel injection pipe 1a. Fuel water drain plug 8. Fuel pipe (manual pump filter) 2. Air bleeding screw (for fuel filter) 9. Fuel tank 3. Injection nozzle 10. Fuel return pipe 4. Overflow tube 11. Suction pipe 5. Fuel pipe (filter injection pump) 12. Feed pump 6. Overflow valve 13. Injection pump 6.1.2.
Injection pump The components relating to the injection pump should be serviced at regular intervals as the plunger and delivery valve may be worn after a given length of time for use and cause the dete- rioration of the engine. Make sure that servicing should be performed at the professional maintenance shop as autho- rized by Bosch or Zexel Company. For adjustment of fuel injection volume, refer to the ‘Specifications of fuel injection pump’ described on the following pages. - 111 - MAINTENANCE OF MAJOR COMPONENTS