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A

737-300/400/500MAINTENANCE MANUAL 
CLEVIS BOLT 
FORWARD
MANIFOLD 
NUTS 
POWER CONTROL UNIT 
WRENCH HEAD  TORQUE WRENCH 
FOR THE 
RUDDER PCU 
FWD 
CLEVIS BOLT 
BUSHING  CLEVIS BOLT  C 
WASHER 
ROD END BOLT 
ROD ASSEMBLY 
FORWARD 
MANIFOLD 
ASSEMBLY 
NUT  WASHER 
FWD  FWD 
A-A 
B-B 

VERNIER CONTROL ROD LARGE NUT
SMALL NUT FWD
C-C
Rudder Power Control Unit Installation Figure 401 (Sheet 2)
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737-300/400/500MAINTENANCE MANUAL
SEE E
SYSTEM A
SYSTEM A SYSTEM B PRESSURE
RETURN RETURN SYSTEM B PRESSURE
FWD 
HYDRAULIC LINE CONNECTIONS D 
PRESSURE SYSTEM B 
RETURN SYSTEM B 
RETURN SYSTEM A 

SYSTEM A
PRESSURE FWD
HYDRAULIC LINE CONNECTIONS (PLAN VIEW)
E
Rudder Power Control Unit Installation Figure 401 (Sheet 3)
F37902
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 B.
C.
D.
E.
A
737-300/400/500MAINTENANCE MANUAL
 (2)  Rig Pin R-5 - 0.311 +0.000/-0.002 inch diameter, 6.7 |0.25-inches long (F70207-11)
 NOTE: The rig pin is a part of the kit F70207-69, -78, or -83.
____
 (3)
C27025-1 Torque Wrench, Rudder PCU Attachment NutConsumable Materials

 (1)  
D00196 Hydraulic Fluid BMS 3-11

 (2)
D00567 Skydrol Assembly Lube MCS 352References

 (1)  
12-12-00/301, Hydraulic Reservoir

 (2)  
27-21-00/201 Rudder Control System

 (3)  
27-21-91/501, Rudder Power Control Unit

 (4)  
27-21-91/601, Rudder Power Control Unit

 (5)
32-00-01/201, Ground Lock AssembliesAccess

 (1)  
Location Zone 203 Nose Wheel Well 706 Vertical Stabilizer

 (2)  
Access Panels 9510 TE Access Door 9512 TE Access Panel - Rudder 9513 TE Access Panel - Rudder 9514 TE Access Panel - Rudder 9559 Cover - Rudder Nose

Procedure
 S 214-013
 (1)  Make sure the rig pin R-5 is installed.
 S 224-014
 CAUTION: EXAMINE THE VERNIER CONTROL ROD AND BOLT, THE CLEVIS BOLT AND
_______ THE ROD END BOLT BEFORE THE INSTALLATION. THESE ARE DUAL LOAD PATH COMPONENTS. A FAILURE OF THESE PARTS CAN CAUSE DAMAGE TO THE AIRPLANE.
 (2)  
Examine the rudder PCU and the parts that hold it for worn areas (AMM 27-21-91/601).

 (3)  
Remove the rudder lock.

 S 094-015
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737-300/400/500MAINTENANCE MANUAL
 S 424-036
 CAUTION:_______ MAKE SURE THAT YOU FOLLOW THE INSTRUCTIONS TO INSTALL THE PCU
 CAREFULLY AND DO THE PROCEDURE IN THE SPECIFIED SEQUENCE.
 DAMAGE TO THE VERNIER CONTROL ROD CAN OCCUR IF THE INSTRUCTIONS

 ARE NOT FOLLOWED CORRECTLY.
 (4)  
Install the PCU (Fig. 401):

 (a)  
Put the PCU in its position with the forward manifold on the beam assembly.

 (b)  
Install the bushing, clevis bolt, three washers and two nuts to attach the forward manifold.
　
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