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 151 of 208
TM 9-2910-226-34
(1) All new fuel injection pump assemblies
from stock, as well as service and repaired pumps
must be calibrated on a test stand, using calibration
limits tables 3-4 through 3-7, before installation on
an engine.
(2) The fuel injection pump must be completely
assembled for this test. Fuel density compensator
assemblies may be new, functionally checked in
accordance with paragraph 3-24.
(3) Push the test stand 24-volt button (P). The
power ON light (Z) should glow. Turn the auxiliary
motor switch (AA) to the ON position.
(4) Turn on the lube heat switch (T) to bring oil
to 150° on the lube oil temperature gage (C).
(5) Adjust the lube oil regulator (JJ) to obtain
an oil pressure of 35-45 psi on lube oil pressure gage
(D). Assure adequate drainage to prevent flooding
pump internally.
Table 3-9. Temperature of Specific Gravity Conversion
Temperature
Specific
in degrees F.
gravity
60
0.810-0.830
65
0.808-0.828
70
0.806-0.826
75
0.804-0.824
80
0.802-0.822
85
0.800-0.820
90
0.798-0.818
95
0.797-0.816
100
0.795-0.815
105
0.793-0.813
110
0.791-0.811
115
0.789-0.809
120
0.787-0.807
125
0.785-0.805
130
0.783-0.803
NOTE
Hydrometer, 6630.350-9431 is available.
(6) Turn on the fuel heat switch (R) to bring fuel
temperature within range listed on calibration
tables. Check temperature on gage (B).
(7) Open suction valve of fuel supply hose (A,
fig. 3-163); and adjust fuel regulator (HH) to obtain
3-5 psi on gage (GG) at supply pump inlet.
(8) Set 500-1000-OFF count switch (V) at 1000,
the FORWARD-OFF-REVERSE switch (CC) at the
REVERSE position,
and the test stand speed
shifting crank (S) at “High Range” position. Slowly
increase fuel pressure by turning regulator (HH)
until the overflow valve opens. This can be observed
since the fuel pressure gage (A) will show a sudden
drop in pressure. Record the pressure. The valve
should open at 33-38 psi. If not, replace the overflow
valve and repeat the test. Reset fuel pressure to 5
psi.
(9) Push in drive motor start button (EE) and
adjust speed to 600 rpm. Maintain this speed for five
minutes to allow for warm-up.
(10) Turn lube oil regulator (JJ) to bring oil
temperature to 150 degrees F. on the lube oil tem-
perature gage (C). Turn fuel heat switch (R) to bring
fuel temperature to 150° F. as indicated on the fuel
temperature gage (B). Fuel pressure to hydraulic
head (compensator inlet) should be within. limits
shown in table 3-10 during testing of pumps.
NOTE
Run test stand long enough for the fuel to
heat to 140° F. Adjust heater control as
necessary to obtain this temperature.
(11) Remove operating lever dust cover.
Remove socket head pipe plug from rear of governor
housing on code A, B, E, and F pumps (fig. 3-163).
(On code G pumps remove governor cover.) Back out
droop screw (fig.
3-172) sufficiently to insure
clearance between droop screw and stop plate, with
operating lever in full-throttle position. The droop
screw must not be in contact with the stop plate
when setting full throttle fuel flow. Install governor
cover on code G pumps.
Figure 3-172. Adjusting droop screw and stop plate guide screw
for desired fuel delivery (code G pumps).
NOTE
Sub paragraph (11) above does not apply to
code C and D pumps as a droop screw is not
used on these pumps.
(12) Check fuel return pressure on gage at
pump overflow valve outlet. Pressure should not be
greater than 5 psi. If pressure exceeds 5 psi, replace
pump overflow valve.
c. Calibration of Code C, D, E, and G Pumps.
Calibrate code C, D, and G pumps using Table 3-5 as
reference. Calibrate code E pumps using Table 3-4 as
reference.
(1) Use two-hole injector nozzle and holder
assemblies.
(2) Adjust speed to 2850 rpm with operating
lever in full-fuel position and check fuel pressure on
gage (A, fig. 3-162) at compensator inlet. Fuel
pressure on fuel pressure gage (A) should be 60-80
psi. If fuel pressure is below 60 psi, inspect fuel
supply pump (para 3-20) and the test stand fuel
3-105
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