TM 9-2910-226-34 supply filters. Then if pressure is still low, replace the over-flow valve. Fuel flow should be in ac- cordance with Table 3-4 or 3-5, depending on pump used. If reading in the burette (F, fig. 3-162) is not within specifications, push in the fuel dumping lever (E) to clear the burettes, and repeat test. If reading is not within specifications, push in fuel dumping lever to clear burettes. Fuel flow adjustment is made by adjusting high speed adjustment screw (fig. 3- 173). Loosen the hex nut and turn the screw clock- wise to decrease, or counterclockwise to increase the fuel delivery. Make adjustments and repeat test until specified fuel flow is attained. Tighten hex nut to lock setting of the high-speed adjustment screw Figure 3-173. Idle and High speed adjustment. Table 3-10. Fuel Supply Pump Pressure (To Hydraulic Head) Speed [rpm] Pressure [psi] 2600-3100 60-80 1200 40-55 700 30-40 150 7 (min. ) (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) on code C, D, and E pumps, or (fig. 3-172) on code G pumps, to obtain fuel flow per Table 3-4 or 3-5. NOTE Turn stop plate adjusting nut clockwise to decrease fuel and counterclockwise to in- crease fuel, as viewed at the governor end of the pump. If fuel flow limit can not be ob- tained by adjusting the stop plate, it will be necessary to inspect the fuel control rod linkage (para 3-25). Replace defective parts, and repeat the tests to obtain specified fuel flow. Check governor spring and spacers (fig. 3-142, 3-143, 3-144, and 3-145). F’igure 3-174. Adjusting stop plate guide screw and stop plate for desired fuel delivery (code C, D, and E pumps). (4) Increase pump speed to 2940 rpm and check fuel flow. Flow should be 5 cc or less. If reading of 5 cc or less is not obtained, it will be necessary to stop the test and check the high speed (inner) governor spring spacer(s). See Table 3-11 for proper spacer dimensions (refer to para 3-43). Check for use of the correct spring (fig. 3-143). Check control unit for pin wear (para 3-44). NOTE Adding spacers to the governor spring will increase fuel delivery, and decreasing spacers will decrease fuel delivery. Repeat 2940 rpm fuel flow check, and add or remove spacers to obtain a fuel flow of 5 cc maximum. (5) Adjust speed to 1400 rpm and check fuel pressure on gage (A, fig. 3-162) at compensator inlet. Fuel pressure should be 40-55 psi. Check fuel flow per Tables 3-5 or 3-4 respectively. (This is a reference point only,) No adjustment is required on C and D pumps. Adjust setscrew (droop screw) (J, fig. 3-67) on code E pumps. Turn screw clockwise to decrease fuel delivery, and counterclockwise to increase fuel delivery. (Code C and D pumps do not have a droop screw.) (6) If fuel flow cannot be adjusted to these limits, check engagement of compensator stop plate and linkage on code C, D, and E pumps and angular position of smoke limit torque cam on all pumps (table 3-8). (Refer to figure 4-73.) Raising the cam to a greater angle will increase fuel flow and decreasing the cam angle will decrease the flow. Recheck fuel flow. (7) Reduce speed to 700 rpm and check fuel pressure on gage (A, fig. 3-162) at compensator inlet (code C, D, and E pumps) or head inlet (code G 3-106