SERVICE MANUALROBERT BOSCH MODEL MW INJECTION PUMPSection 11Figure 4. - Injection Pump LubricationINJECTION PUMP IDENTIFICATIONIdentification of injection pump and governor can bemade by referring to two nameplates, one on the fronttop left of the injection pump housing and one on the rearof the injection pump housing (Figure 5). The pumphousing nameplate provides the Robert Boschcombination number which defines the injection pumpcomponents supplied by the manufacturer. Theproduction IH part number for the complete injectionpump assembly including governor, transfer pump,mounting adapter, etc., is located on the governorhousing. Robert Bosch’s governor number, size andrating is also located on the governor housing.FUEL SYSTEM FLOWAs fuel travels through the fuel system, it will be undersuction (negative pressure), intermediate pressure, highpressure (injection pressure) and low pressure (Figure6).Negative PressureThe piston-type supply pump creates a suction at its inletand pulls fuel from the fuel tank, through the fuel supplylines and through the primary fuel filter. No filter is usedon the fuel suction line extending into the fuel tankFigure 5. - Injection Pump IdentificationFigure 6. - Fuel System FlowCGES-185-3PRINTED IN UNITED STATES OF AMERICAPage 5
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