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
