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757 MAINTENANCE MANUAL
 (2)  S 865-283Remove hydraulic power if it is not necessary (AMM 29-11-00/201).
 (3)  S 865-284Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P11 panel: (a) 11D31, HYDRAULICS PTU CONT. (b) 11G12, FSEU-1 PWR, FLAP SLAT ELEC UNIT 1 PWR OR FLAP SLAT ELEC UNIT 1 POWER (c) 11G12, FLAP SLAT ELEC UNIT 1 POWER (d) 11H23, FLAP/SLAT ALTN DR SHUTOFF ARM
 (4)  S 615-285Fill the reservoirs in the left and right hydraulic systems (AMM 12-12-01/301).
 (5)  S 865-286Remove electrical power if it is not necessary (AMM 24-22-00/201).

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 HYDRAULIC POWER TRANSFER UNIT (PTU) - REMOVAL/INSTALLATION
__________________________________________________________
 1.  General
_______
 A.  This procedure has two tasks. One task removes the power transfer unit (PTU) for the hydraulic system. The other task installs the PTU.
 TASK 29-22-01-004-001
 2.  Remove the Power Transfer Unit (PTU) (Fig. 401)
____________________________________
 A.  References
 (1)  
AMM 29-11-00/201, Main (Left, Right, and Center) Hydraulic Systems

 (2)  
AMM 32-00-15/201, Main Gear Door Locks

 (3)  
AMM 32-00-20/201, Landing Gear Downlocks

 B.  Access
 (1)  Location Zone
 143 Left MLG Wheel Well

 C.  Procedure
 S 494-002
 (1)  Make sure the downlocks are installed on the nose and main landing gear (AMM 32-00-20/201).
 S 494-003
 WARNING: DO THE PROCEDURE IN AMM 32-00-15/201 TO INSTALL THE DOOR LOCKS.
_______ THE DOORS OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  
Open the doors for the landing gear and install the door locks (AMM 32-00-15/201).

 S 864-004

 (3)  
Remove the pressure from the left and the right hydraulic systems and the reservoirs (AMM 29-11-00/201).

 (4)  
Open the drain valve on the left hydraulic reservoir.

 S 864-037
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SEE B POWER DRIVE UNIT TRAILING EDGE FLAP (NOT SHOWN IN THIS VIEW) 
SEE LEFT MAIN WHEEL WELL A  C TRANSFER POWER SEE UNIT 
SYSTEM FROM THE LEFT 29. PRESSURE LINE 
VALVE LIMITER 28. FLOW 
30. HYDRAULIC LINE FROM BYPASS VALVE THE CONTROL VALVE TO 
VALVE CONTROL  A LEFT MAIN WHEEL WELL SYSTEM TO THE LEFT 27. RETURN LINE  FWD 

FLAP BYPASS VALVE
FWD
TRAILING EDGE FLAP POWER DRIVE UNIT
B

Power Transfer Unit (PTU) Installation Figure 401 (Sheet 1)
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