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 154 of 208
TM 9-2910-226-34
step
c
(4) above for procedure.) Check condition of
fuel control unit and pin (para 3-44).
(5) Reduce 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 3-7. (Refer
to
c
(5) and (6) above for procedure.)
(6) If fuel flow cannot be adjusted to these
limits, check engagement of compensator stop plate,
torque link stop and guide, and the angular position
of smoke limit torque cam. (Refer to
c
(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 3-7. (Refer to
c
(7) above for procedure. )
(8) Check 2800 rpm full-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 shifting
crank (S) to LOW RANGE.
(10) Restart the test stand and adjust speed to
150 rpm, with operating lever in full fuel position.
Set count at 1000 and collect fuel in fuel burettes.
Fuel flow should be in accordance with Table 3-7. If
the fuel flow is below specified limit, the hydraulic
head and plunger are worn excessively and the head
must be replaced. Replace hydraulic head assembly
if proper flow is not obtained, and retest the pump.
(11) Activate fuel injection pump electric
solenoid fuel shut-off. Apply 24 v dc to solenoid
electrical connect ion.
Fuel should stop flowing
immediately each time the solenoid is activated. If
shut -off does not operate, replace solenoid (para 3-
47).
(12) Check operating lever travel with tem-
plate, 5120-134-7462, as shown in fig. 3-175.
Template should be held flush against side of
transfer pump with center line mark alined with
shaft. Center line of lever must fall within lines
indicated. If not within template limits, check
governor spacers and springs, gaps and preloads,
operating lever to operating shaft position, and
smoke limit torque cam angle. If corrections are
necessary, fuel flow of pump should be rechecked
after any adjustments are made.
Figure 3-175. Checking operating lever position (code A pumps).
f. Shut-down
of Test Stand After Pump
Calibration.
(Refer to fig. 3-162). Push drive motor
stop button (DD) to stop test stand. Turn off the fuel
and lube oil heat switches (R and T), the 500.1000-
OFF count switch (V), the FORWARD-OFF-
Reverse switch (CC), and the auxiliary motor switch
(AA). Back off the fuel and lube oil regulators (JJ,
HH). Push test stand 24-volt button (P).
g. Removal of Pump from Test Stand,
(1) Refer to figures 3-163, 3-169 and 3-170, and
disconnect and remove the following hoses:
(a)
Test stand lube pressure-to-fuel injection
pump hose (E) to the fuel injection pump oil inlet
fitting in the advance housing.
- -
(b)
Fuel injection pump lube return-to-test
stand lube return hose (F) to the test stand lube oil
return.
(c)
Test stand fuel pressure-to-supply pump
inlet hose (A) to the inlet port of the fuel injection
pump fuel supply pump.
(d)
Fuel injection pump fuel outlet-to-
compensator inlet hose (B) to the adapter (J) at the
compensator inlet tee (H) (on code G pumps the hose
to the hydraulic head).
(e)
Compensator inlet tee pressure gage hose
(C) to the fuel pressure gage (or panel connection).
3-108
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