SERVICE MANUALROBERT BOSCH MODEL MW INJECTION PUMPSection 11GENERAL PUMP INFOEngines with serial numbers below 400 000 use theUTDS* Model 100 pump, with the exception of DT-466B,TD 15C Paydozers and DT-466B, 175C Payloader whichuse the Robert Bosch MW Pump.Engines with serial numbers above 400 000 (all DT-466"C" series) use the Robert Bosch Model MW Pump.OPERATION ROBERT BOSCH MODEL MW PUMPPUMP FEATURESThe Robert Bosch Model MW injection pump is amultiple plunger design with one plunger, barrel anddelivery valve for each engine cylinder. A variable speedgovernor allows engine speeds to be controlled withinspecified limits for power takeoff applications.Depending upon engine application or customerpreference, the pump is equipped with an electrical ormechanical fuel shutoff. Each pump has a hand primingpump to fill filters after replacement of fuel. Exhaustsmoke levels during engine acceleration are controlledby an aneroid assembly.The pump consists of the following major componentswhich will be reviewed, first briefly then in more detail toassist the reader in understanding construction featuresand pump operation: (Figure 2)Mounting AdapterMW Injection PumpSupply Pump with Hand Priming PumpRQV GovernorAneroid AssemblyFuel Return ValveFigure 2. - Pump Features*United Technologies Diesel Systems(formerly AMBAC)CGES-185-3PRINTED IN UNITED STATES OF AMERICAPage 2
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