(a) Make sure the PTU control valve opens.
 S 865-048
 (20) Supply system B hydraulic power with the EMDP or a ground service cart (AMM 29-15-00/201).
 NOTE: You cannot use the EDP because the EDP pressure switch must
____
 indicate low pressure.

 (a) Feel and listen to the PTU to make sure it does not operate.
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737-300/400/500MAINTENANCE MANUAL
 (b)  Make sure the hydraulic pressure in system A does not increase.
 NOTE: If the PTU operates or the pressure in system A
____ increases then the check valve in the system B pressure line of the PTU is broken. Replace these parts:
 -
The PTU (AMM 29-22-11/401) (It can have damage that you cannot find)

 -
The PTU check valve

 -
The PTU pressure filter element (AMM 29-22-21/201).

 F. Put the Airplane Back to Its Usual Condition
 S 865-049
 (1)  
Move the flap control lever to the UP position to retract the flaps and slats.

 S 865-050

 (2)  
Remove the hydraulic power from system B (AMM 29-15-00/201).

 S 865-078

 (3)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P6-2 Panel
 1) NOSE GEAR AIR/GND

 (b)  
P6-11 Panel
 1) STBY HYD PUMP NORMAL

 (c)  
P6-12 Panel
 1) STBY HYD PUMP (ALTERNATE)

 S 085-062
 (4)  
Disconnect the ground service cart (if you used one) from hydraulic system A.

 (5)  
Remove the electrical power (AMM 24-22-00/201).

 S 865-052
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 POWER TRANSFER UNIT (PTU) - REMOVAL/INSTALLATION
________________________________________________
 1.  General_______
 A.  There are two tasks in this procedure. There is a task for the removal and a task for the installation of the power transfer unit (PTU).
 TASK 29-22-11-004-001
 2.  PTU Removal (Fig. 401)___________
 A.  Standard Tools and Equipment
 (1)  Container - suitable to catch hydraulic fluid
 B.  References
 (1) AMM 29-09-00/201, Hydraulic Reservoir Pressurization System
 C.  Access
 (1)  Location Zone
 216, 217 Main Wheel Well

 D.  Prepare for the Removal
 S 864-003
 (1)
Remove the systems A and B hydraulic power (AMM 29-15-00/201).

 S 864-004

 (2)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  P6 Panel
 1) ELEC HYD PUMP CONT SYS A
 2) ELEC HYD PUMP CONT SYS B
 3) STBY HYD PUMP NORMAL
 4) STBY HYD PUMP (ALTERNATE)
 5) PTU/LG BYP V CONT 1
 6) PTU/LG BYP V CONT 2

 (3)  
Release the pressure in the hydraulic reservoirs (AMM 29-09-00/201).

 S 684-006

 (4)  
Fully drain the system B reservoir.

 S 864-005
 E.  PTU Removal
 S 034-007
 (1)  Disconnect the hydraulic lines from the PTU:
 (a)  Put a container below the hydraulic lines to catch the hydraulic fluid.
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A 737-300/400/500MAINTENANCE MANUAL
STANDBY RESERVOIR (REF)
　
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