TM 9-2320-260-34-1
5-25. FUEL PUMP CALIBRATION (Contd)
m. Testing and Adjusting Idle Speed (VS Governor Only)
1. Place throttle lever (14) and VS governor lever (18) to full fuel position.
2. Increase fuel pump (4) speed to 2140 rpm.
3. Loosen locknut (16). Turn high idle screw (15) in until fuel pressure starts to drop, then retighten
locknut (16).
4. Decrease fuel pump (4) speed to 2100 rpm and gradudly increase speed until fuel pressure starts to
drop. Fuel pump (4) speed should be 2120-2140 rpm.
5. If fuel pump (4) speed is not 2120-2140 rpm, adjust high idle screw (15) until speed is 2120-2140
rpm.
6. Decrease fuel pump (4) speed to 500 rpm. Place VS governor lever (18) to idle position and test
stand (1) selector valve (12) to idle position.
7. Adjust VS governor low idle screw (17) to obtain 26 psi (179 kPa).
n. Shut Down and Removal From Test Stand
1. Press stop button (6) to stop test stand (1).
2. Turn off fuel heat switch (5), close fuel pressure control valve (7), and close fuel flow control
valve (18).
3. Remove 0.25 in. (6.35 mm) hose (8) from fitting (3) on fuel pump (4) and fitting (9) on test
stand (1).
4. Remove leakage accumulator hose (11) from number one accumulator can (2) and test stand leak
test connector (10).
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