(5) Disconnect the fuel supply hose from the union (10) of the fuel injection supply tube.
(6) Remove the bolts (80) and washers (90) that attach the inlet bracket to the HMU.
(7) Remove the bolts (60) and washers (70) that attach the discharge bracket to the HMU.
(8) Remove the assembled fuel flow transmitter, fuel supply tube, inlet bracket, discharge bracket, and fuel supply hose from the HMU.
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R Hydromechanical Unit Figure 401/TASK 73-21-10-991-302- 17 (SHEET 1)
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(9) Install blanking plugs on the open discharge port of the HMU and on the open ends of the fuel supply tube.
(10) Install blanking plugs on the fuel supply hose and the union (10) of the fuel injection supply tube.
(11) Remove the gasket (110) from the discharge port of the HMU.
(12) Disconnect the electrical connector, Channel A (120) and Channel B (210), from the HMU. If necessary, use soft nose pliers.
(13) Disconnect the electrical connector (170) from the latching solenoid. If necessary, use soft nose pliers.
(14) Put blanking caps on the disconnected electrical connectors.
(15) Disconnect the flex-hoses from the HMU nipples that follow: CAUTION : USE 2 WRENCHES TO REMOVE OR INSTALL THE TUBE COUPLING NUTS.
_______ ONE WRENCH TO HOLD THE UNION AND ONE TO LOOSEN OR TIGHTEN THE COUPLING NUT. THIS WILL PREVENT DAMAGE TO THE HARDWARE.
(a) VBV open hose (240) from nipple (220).
(b) RACSB hose (400) from nipple (410). R NOTE : Only applicable for non /P engines.
____
R (c) TBV hose (400) from nipple (410).
R NOTE : Only applicable for /P engines.
____
R (d) VBV closed hose (310) from nipple (320).
R (e) PCR hose (280) from nipple (290).
R (f) HPTACC hose (460) from nipple (470).
R (g) LPTACC hose (430) from nipple (440).
R
R PRE CFMI SB 73-0096
R
R (h) SOV hose (570) from nipple (580).
R NOTE : Only applicable for SAC engines.____
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R R R PRE CFMI SB 73-0114
R (i) BSV hose (270) from nipple (250).
R NOTE : Only applicable for DAC engines.____
R (j) VSV head hose (370) from nipple (380).
R (k) VSV rod hose (340) from nipple (350).
R (l) OVBD drain tube (600) from nipple (490).
NOTE : If necessary, loosen the first union of each flex-hose____ from the HMU. This will permit the flex-hose to move so that you can easily remove the HMU.
(16) Install blanking plugs on the disconnected flex-hose ends.
R R (17) Remove the bolts (520) to remove the servo heater-return hose (530) from the servo port on the HMU.
R R (18) Remove the gasket (510) between the servo heater-return hose (530) and the servo port on the HMU.
R R (19) Install blanking cover on the open end of the servo heater-return hose (530).
(20) Remove the bolts (550) to remove the IDG supply tube (540) from the IDG port on the HMU.
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