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 153 of 208
TM 9-2910-226-34
pumps). Fuel pressure should be 30-40 psi. With
operating lever in idle position, adjust low-idle speed
screw to obtain fuel flow per Table 3-5 or 3-4. If
reading is not within limit, loosen idle adjustment
screw locknut and turn idle adjustment screw (fig. 3-
173). Turn screw clockwise to increase fuel delivery
and counterclockwise to decrease fuel delivery.
Adjust screw to obtain specified flow, and tighten
screw locknut.
(8) Check 2600 rpm full-load fuel flow. If fuel.
flow does not fall within limits repeat steps (2)
through (7) above.
(9) Reduce test stand rpm to a minimum. When
speed reaches minimum push drive motor stop
button (DD, fig. 3-162) and turn speed shifting
crank (S) to LOW RANGE.
(10) Restart the test stand and adjust speed to
150 rpm with operating lever in full-load position, set
count at 1000 and collect fuel in fuel burettes. Check
fuel pressure gage (A). Reading should be 7 psi
minimum. Fuel flow should be in accordance with
Table 3-5 or 3-4. If fuel pressure is below 7 psi, in-
spect fuel supply pump (para 3-20). If fuel flow is
below the specified minimum, the hydraulic head
and plunger are excessively worn and the head must
be replaced. Replace hydraulic head assembly if
proper flow is not obtained, and retest the pump.
(11 ) Pull injection pump fuel shutoff rod. Fuel
should stop flowing immediately each time the rod is
pulled. If fuel does not stop, check fuel shutoff to
make certain the rod is properly engaged with the
control unit lever.
(12) On code G pumps, set droop screw per
special instructions in Table 3-5. On code E pumps,
set droop screw per special instructions in Table 3-4.
d. Calibration of Code B and F Pumps.
Calibrate
injection pump code B or F using Table 3-6.
(1) Use two-hole injector nozzle and holder
assemblies (fig. 3-163, 3-169 and 3-170) with code F
pump, and one-hole injector nozzle and holder
assemblies with code B injection pump.
NOTE
Code B pumps used to replace code F pumps
must be calibrated with two hole nozzles.
After calibration, tag the pump making one
of the following statements as applicable:
FOR USE ON CODE B ENGINE
ASSEMBLY (LDS-465-lA)
FOR USE ON CODE F ENGINE ASSEM-
BLY (LDS-465-1)
(2) Adjust speed to 2850 rpm and check fuel
pressure on gage (A, fig. 3-162) at compensator
inlet. Fuel pressure should be 60-80 psi. Fuel flow
should be in accordance with Table 3-6, depending
on fuel used. Fuel flow adjustment is made by ad-
justing high-speed adjustment screw (fig. 3-173).
(See step c. (2) above for procedure.)
(3) Adjust speed to 2600 rpm and check fuel
pressure on gage (A, fig. 3-162) at compensator
inlet. Fuel pressure should be 60-80 psi. Adjust stop
plate guide screw (fig. 3-174) to obtain fuel flow per
table 3-6. (See step c. (3) above for procedure, )
(4) Adjust speed to 2940 rpm and check fuel
flow, Flow should be 5 cc or less to meet
specification. If fuel flow is not to limit, the pump
must be shut down and the high-speed (inner)
governor spring and spacer(s) must be checked and
adjusted. (See step c. (4) above for procedure).
Check condition of fuel control unit and pin (para 3-
44).
(5) Adjust speed to 1200 rpm and check fuel
pressure on gage (A, fig. 3-162) at compensator
inlet. Fuel pressure should be 40-55 psi. Adjust
droop screw to obtain fuel flow per Table 3-6. (See
step c. (5) and c. (6) above for procedure.)
(6) If fuel flow cannot be adjusted to these
limits, check engagement of compensator stop plate
and linkage and angular position of smoke limit
torque cam. (See steps
c
(5) and (6) above for
procedure.)
(7) Reduce speed to 700 rpm and check fuel
pressure on gage (A, fig. 3-162) at compensator
inlet. Fuel pressure should be 30-40 psi. With
operating lever in idle position, adjust low idle
adjustment screw (fig. 3-173) to obtain fuel flow per
Table 3-6. (See step c(7) above for procedure. )
(8) Check 2600 rpm full-load fuel flow. If fuel
flow does not fall within limits, repeat (2) through (7)
above.
(9) Reduce test stand rpm to a minimum. When
speed reaches minimum, push drive motor stop
button (DD, fig. 3-162) and turn speed shifing crank
(S) to LOW RANGE.
(10) Restart the test stand and adjust speed to
150 rpm with operating lever in full-load position.
Set count at 1000 and collect fuel in fuel burettes.
Fuel flow should be in accordance with Table 3-6. If
the fuel flow is below specified limit, the hydraulic
head and plunger are excessively worn and the head
must be replaced. Replace hydraulic head assembly
if proper flow is not obtained, and retest the pump.
(11) Pull injection pump fuel shut-off rod. Fuel
should stop flowing immediately each time the rod is
pulled. If fuel does not stop, check fuel shut-off to
make certain the rod is properly engaged with the
control unit lever.
e. Calibration of Code A Pump.
Calibrate code A
injection pump using Table 3-7.
(1) Use one-hole nozzle and holder assemblies.
(2) Adjust speed to 3100 rpm and check fuel
pressure on gage (A, fig. 3-162) at compensator
inlet. Fuel pressure should be 60-80 psi. Fuel flow
should be in accordance with Table 3-7, depending
on fuel used, Fuel flow adjustment is made by ad-
justing high-speed adjustment screw (fig. 3-173).
(Refer to step c (2) above for procedure. )
(3) Adjust speed to 2800 rpm and check fuel
pressure on gage (A, fig. 3-162) at compensator
inlet. Fuel pressure should be 60-80 psi. Adjust stop
plate guide screw (fig. 3-174) to obtain fuel flow per
Table 3-7. (Refer to c (3) above for procedure. )
(4) Adjust speed to 3150 rpm and check fuel
flow. Flow should be 5 cc or less to meet
specification.
If fuel flow is not within limit, the
pump must be shut down and the high-speed (inner)
governor spring must be checked and adjusted. (See
3-107
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