SERVICE MANUAL ROBERT BOSCH MODEL MW INJECTION PUMP Section 11 Field   Test   for   Transfer   Pump   Pressure   and   Inlet Restriction: 1. Disconnect  supply  hose  by  loosening  connector  at elbow (Figure 39). 2. Install   tee   fitting   (IH   P/N   444   121)   with   reducer coupling  (IH  P/N  444  024)  and  hose  assembly  (IH P/N   688   187   C1)   with   5/8-18   45°   flare   swivel connectors  at  each  end  between  elbow  and  supply hose as shown in Figure 40. Figure 40.  - Measuring Transfer Pump Pressure 3. Connect  pressure  gauge  at  reducer  as  shown  in Figure 40. 4. Inspect   throttle   linkage   for   any   binding   that   can restrict  full  travel  of  linkage  or  cause  linkage  to  be difficult to operate. 5. Linkage should have a slight spring override at wide open throttle. 6. Inspect  all  lines  and  connectors  between  fuel  tank and injection pump.  Be sure lines are not pinched, connections  are  tight  and  valve  at  fuel  tank  is  fully opened. 7. Run engine at high idle (RPM). 8. Record pressure and compare readings to specifications shown in appropriate Engine Diagnostic Manuals: Publication   Application CGES-240-1 On-Highway Truck & OEM ISS-1526-3 Construction Equipment GSS-1414-1 Agricultural Equipment 9. If specifications are not met, change fuel filters. 10.  If  changing  fuel  filters  does  not  bring  fuel  pressure into specs, a vacuum check taken at supply inlet will measure   total   restriction   on   suction   side   of   fuel system (between tank and supply pump). NOTE:   If   installation   of   new   fuel   filters   corrects reading DO NOT check inlet restriction. Check inlet restriction as follows: 1. Install   tee   fitting   and   hose   assembly   (Figure   41) between pump inlet and inlet line (Figure 42). Figure 41.  - Hose Assembly for Measuring Fuel Inlet Restriction 1. Connector (Part No. 118 752) 2. Tee (Part No. 120 280) 3. Standard 1/8 inch Male Connector as used in Pressure Kit (SE-2239) or (PLT-300) for Connection to Manometer or Gauge 4. Reducing Bushing (Part No. 119 933) 5. Hose (Part NO. 610 403 C91) CGES-185-3 PRINTED IN UNITED STATES OF AMERICA Page 26