TM-9-2910-226-34
PUMP, FUEL, METERING AND DISTRIBUTING, ASSEMBLY
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT, MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS
JUNE 1974
TM-9-2910-226-34 - Page 32 of 208
TM 9-2910-226-34
diametrically from the fuel pump end of the hub and
is channeled to receive the ends of the three timing
device springs (B). The new style hubs do not have a
flange and are counterbored to receive the timing
device springs. The springs oppose the flyweight
forces of the weight and spider assembly (AH).
c.
The weight and spider assembly has external
right hand helical splines to mesh with the internal
helical splines of the sliding gear. The splined end is
machined to receive the end play spacer (AE). Three
flyweights are pinned to a flange adjacent to the
splines. The weight and spider thrust plate (AG),
located between the flange and the timing device
housing, carries the back-thrust of the flyweights
and prevents housing wear,
d.
The sliding gear has internal left hand helical
splines at one end and internal right hand helical
splines at the other end and meshes with the external
splines of both the weight and spider assembly and
the timing device hub. Correct assembly of the spline
train is insured by a wide land on both the hub and
weight and spider assembly. The sliding gear has a
missing tooth on each set of internal splines to
receive the wide lands. Three arms extend from the
outer surface of the sliding gear and provide seats for
the three timing device springs. The force on the
springs is controlled by a sliding gear spacer (AF).
1-17. Fuel Density Compensator (Code F Injection
Pump).
NOTE
The key letters shown below in parentheses
refer to figure 1-15.
a.
The diaphragm housing (BB) is attached to the
top of the governor housing and contains the stop
plate (PP), guide (AA), inlet housing diaphragm
(LL), and related parts.
b.
The fuel inlet housing (DD) attaches to the
diaphragm housing and contains the fuel inlet port
(JJ) and pressure regulator valve (HH).
c.
The pressure regulator valve (HH) is adjusted
by the use of shims. This valve determines the inlet
fuel pressure.
d.
The fuel outlet housing (EE) attaches to the
fuel inlet housing and contains a fuel outlet port
(GG) and an adjustable servo pressure valve (FF).
The fuel outlet housing also has a recess for the servo
spring (CC ).
e.
The servo pressure valve (FF) is adjusted
during calibration of the density compensator to
provide the correct fuel pressure drop across the inlet
housing diaphragm (LL), establishing the stop plate
(PP) travel.
f.
The stop plate guide (AA) provides adjustment
of the fulcrum lever in the injection pump.
g.
The guide bears against the stop plate (PP)
which, in turn, contacts the smoke limit cam (MM).
The guide can be adjusted to move the stop plate
laterally, thereby regulating travel of the governor
fulcrum lever (NN).
1-18. Fuel Density Compensator (Code B, C, D and
E Injection Pumps).
NOTE
The key letters shown below in parentheses
refer to figure 1-16.
a.
The density compensator housing (BB), and
gasket (Y) are attached to the top of the governor
housing.
b.
The compensator housing cover (EE) and
housing cover gasket (FF) enclose the servo spring
(GG) and the servo pressure well.
c.
The pressure regulating valve (JJ) is adjusted
by the use of shims. This valve determines the servo
system inlet fuel pressure.
d.
The fuel outlet is through an elbow at the right
front of the housing connected by a tube to the fuel
injection pump overflow valve tee.
e.
The servo pressure valve (CC) is adjusted
during calibration of the density compensator to
provide the correct fuel pressure on the piston (H H )
and establish the travel of the stop plate (PP).
f.
The stop plate guide (AA) provides adjustment
of the fulcrum lever in the injection pump.
g.
The guide bears against the stop plate (PP)
which, in turn, contacts the smoke limit cam (MM).
The guide can be adjusted to move the stop plate
laterally, thereby regulating the travel of the
governor fulcrum lever (NN).
1-19. Fuel Density Compensator (Code A Injection
Pump).
NOTE
The key letters shown below in parentheses
refer to figure 1-17.
a.
The density compensator housing (BB) and
gasket (Y) are attached to the top of the governor
housing.
b.
The compensator housing cover (EE) and
housing cover gasket (FF) enclose the servo spring
(GG) and the servo pressure well.
c.
The pressure regulating valve (JJ) is adjusted
by the use of shims under the plug at the spring end
of the valve. The valve determines the servo system
inlet fuel pressure.
d.
The fuel outlet is through an elbow at the right
front of the housing connected by a tube to the fuel
injection pump overflow valve tee.
e.
The servo pressure valve (CC) is adjusted
during calibration of the density compensator to
provide the correct fuel pressure on the piston (HH)
and establish the travel of the stop plate (PP).
f.
The stop plate guide (AA) provides adjustment
of
-
the fulcrum
-
lever
g.
The guide bears
(AK) and stop plate
the smoke limit cam
justed to move the
regulating the travel
(NN).
in the injection pump.
against the sliding stop weight
(PP) which, in turn, contacts
(MM). The guide can be ad-
stop plate laterally, thereby
of the governor fulcrum lever
1-24
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