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 HYDRO-MECHANICAL UNIT (HMU) - SERVICING

_______________________________________ TASK 73-21-10-600-002 Preservation of the Hydromechanical Unit (HMU)
 1. Reason for the Job

__________________
 Self Explanatory

 2. Job Set-up Information

______________________
 A. Consumable Materials
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No.  CP2442 * engine oil (Ref. 70-30-00)
 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
73-21-10-991-300  Fig. 301
 3. Job Set-up
__________ Subtask 73-21-10-869-052
 A. Not Applicable
 4. Procedure
_________ (Ref. Fig. 301/TASK 73-21-10-991-300) Subtask 73-21-10-020-054
 A. Preparation for removal: CAUTION : DO NOT HOLD OR MOVE THE HYDROMECHANICAL UNIT BY THE TORQUE
_______ MOTORS. CHANGES TO THE CALIBRATION OF THE HYDROMECHANICAL UNIT CAN OCCUR.
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 Hydromechanical Unit
 Figure 301/TASK 73-21-10-991-300- 12 (SHEET 1)
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 Hydromechanical Unit
 Figure 301/TASK 73-21-10-991-300- 22 (SHEET 2)
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 (1) Remove the following from the new HMU and keep the gaskets:

 (a) Screws (90) and shipping cover (80).

 (b) Gasket (70, 100, 130).

 (c) Screws (120) and shipping cover (110).

 (d) Screws (150) and shipping cover (140).

 (e) Shipping plugs (10, 20, 60, 190, 210, 30, 50, 170, 200, 40, 180).

 (f) Shipping caps (220, 160).

 (2) Remove the nut (250) and the washer (240) from the HMU studs.

 (3) Remove the nuts (260) and the washers (270). Then, remove the bolt

 (300) and the washer (290).
 Subtask 73-21-10-550-052

 B. Remove the new HMU from the shipping block (280). Keep the gasket (230). Subtask 73-21-10-680-052

 C. Fully drain the fuel from the old HMU.
 Subtask 73-21-10-620-053

 D. Put 1 l (0.25 USgal) of engine oil (Material No. CP2442) into the PCR port of the old HMU.
 Subtask 73-21-10-420-055
 E. Install the shipping plug (200) in the PCR port.
 Subtask 73-21-10-620-054

 F. Carefully turn the HMU a minimum of one turn to apply engine oil
 (Material No. CP2442) to the internal parts.

 Subtask 73-21-10-020-055
 G. Remove the shipping plug (200) from the PCR port.
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 H. Fully drain the engine oil (Material No. CP2442) from the PCR port. Subtask 73-21-10-420-056
 J. Preparation for installation:
 (1) Install the shipping plugs, caps, covers and gaskets to the old HMU as follows:

 (a) Gasket (70), shipping cover (80), and screws (90).

 (b) Gasket (100), shipping cover (110), and screws (120).

 (c) Gasket (130), shipping cover (140), and screws (150).

 (d) Shipping plugs (10, 20, 60, 190, 210, 30, 50, 170, 200, 40, 180).

 (e) Shipping cap (160, 220).

 (2) Install gasket (230) on the shipping block (280). Align the holes in the gasket (230) with the holes in the shipping block (280).

 Subtask 73-21-10-550-053
 K. Install the old HMU on the gasket (230) and shipping block (280). Subtask 73-21-10-420-057
 L. Safety the HMU on the shipping block:
 (1) Install the washers (240) and nuts (250) on the HMU studs.

 (2) Install the bolts (300) and washers (290) through the HMU flange and shipping block (280).
　
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