Figure 3-175. Checking operating lever position (code A pumps).

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

Figure 3-175. Checking operating lever position (code A pumps).

button (DD, fig. 3-162), and turn speed shifting

f. Shut-down o f T e s t S t a n d A f t e r P u m p

crank (S) to LOW RANGE.

Calibration. (Refer to fig. 3-162). Push drive motor

(10) Restart the test stand and adjust speed to

stop button (DD) to stop test stand. Turn off the fuel

150 rpm, with operating lever in full fuel position.

and lube oil heat switches (R and T), the 500.1000-

Set count at 1000 and collect fuel in fuel burettes.

OFF count switch (V), the FORWARD-OFF-

Fuel flow should be in accordance with Table 3-7. If

Reverse switch (CC), and the auxiliary motor switch

the fuel flow is below specified limit, the hydraulic

(AA). Back off the fuel and lube oil regulators (JJ,

head and plunger are worn excessively and the head

HH). Push test stand 24-volt button (P).

must be replaced. Replace hydraulic head assembly

g. Removal of Pump from Test Stand,

if proper flow is not obtained, and retest the pump.

(1) Refer to figures 3-163, 3-169 and 3-170, and

(11) Activate fuel injection pump electric

disconnect and remove the following hoses:

solenoid fuel shut-off. Apply 24 v dc to solenoid

(a) Test stand lube pressure-to-fuel injection

electrical connect ion. Fuel should stop flowing

pump hose (E) to the fuel injection pump oil inlet

immediately each time the solenoid is activated. If

f i t t i n g in the advance housing. - -

shut -off does not operate, replace solenoid (para 3-

(b) Fuel injection pump lube return-to-test

47).

stand lube return hose (F) to the test stand lube oil

(12) Check operating lever travel with tem-

return.

plate, 5120-134-7462, as shown in fig. 3-175.

(c) Test stand fuel pressure-to-supply pump

Template should be held flush against side of

inlet hose (A) to the inlet port of the fuel injection

transfer pump with center line mark alined with

pump fuel supply pump.

shaft. Center line of lever must fall within lines

(d) Fuel injection pump fuel outlet-to-

indicated. If not within template limits, check

compensator inlet hose (B) to the adapter (J) at the

governor spacers and springs, gaps and preloads,

compensator inlet tee (H) (on code G pumps the hose

operating lever to operating shaft position, and

to the hydraulic head).

smoke limit torque cam angle. If corrections are

(e) Compensator inlet tee pressure gage hose

necessary, fuel flow of pump should be rechecked

after any adjustments are made.

3-108