SERVICE MANUAL
ROBERT BOSCH MODEL MW INJECTION PUMP
Section 11
Figure 4. - Injection Pump Lubrication
INJECTION PUMP IDENTIFICATION
Identification of injection pump and governor can be
made by referring to two nameplates, one on the front
top left of the injection pump housing and one on the rear
of the injection pump housing (Figure 5). The pump
housing
nameplate
provides
the
Robert
Bosch
combination number which defines the injection pump
components supplied by the manufacturer. The
production IH part number for the complete injection
pump assembly including governor, transfer pump,
mounting adapter, etc., is located on the governor
housing. Robert Bosch’s governor number, size and
rating is also located on the governor housing.
FUEL SYSTEM FLOW
As fuel travels through the fuel system, it will be under
suction (negative pressure), intermediate pressure, high
pressure (injection pressure) and low pressure (Figure
6).
Negative Pressure
The piston-type supply pump creates a suction at its inlet
and pulls fuel from the fuel tank, through the fuel supply
lines and through the primary fuel filter. No filter is used
on the fuel suction line extending into the fuel tank
Figure 5. - Injection Pump Identification
Figure 6. - Fuel System Flow
CGES-185-3
PRINTED IN UNITED STATES OF AMERICA
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