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B.  Depressurize hydraulic reservoirs. Refer to 29-09-300, Hydraulic Reservoir Pressurization System - MP.
C.  Disconnect system B pump supply hose at the reservoir quick disconnect fitting to prevent fluid from draining through pump.
D.  Disconnect hydraulic lines from case drain filter and cap lines (Fig. 401).
E.  Remove mounting bolts and remove filter from mounting bracket.
4.  Install Case Drain Filter
A.  Lubricate 0-rings and threaded fittings with assembly lube or hydraulic fluid.
B.  Install O-ring and check valve (Fig. 401) on case drain filter.
CAUTION:  INSTALL CHECK VALVE SUCH THAT DIRECTION ARROW ON CHECK VALVE AGREES WITH CASE DRAIN FILTER METAL-CAL.
C.  Install union and O-ring in the remaining case drain filter port.
500 
Feb 15/73  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  29-12-71 Page 401 

F87615
System B Hydraulic Pump Case Drain Filter Installation  500 
29-12-71  Figure 401  Aug 15/67 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

D.  Position filter assembly on mounting bracket and install filter mounting bolts.
E.  Remove caps from hydraulic lines and connect hydraulic lines to case drain filter and check valve.
F.  Reconnect pump supply hose to system B reservoir quick disconnect fitting.
CAUTION:  WHEN INSTALLING PUMP SUPPLY LINE QUICK DISCONNECT FITTING, ENSURE THAT INDICATOR PINS ARE EXTENDED. IF PINS ARE NOT EXTENDED, FLUID SUPPLY TO PUMP WILL BE RESTRICTED OR COMPLETELY STOPPED, AND PUMP DAMAGE OR OVERHEATING MAY RESULT.
G.  Pressurize hydraulic reservoirs (Ref 29-09-300 MP).
H.  Close SYSTEM B NORMAL and ALTERNATE circuit breakers and pressurize hydraulic system B using applicable pump (Ref 29-12-0 MP).
I.  Check filter for leaks.
500 
May 01/75  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  29-12-71 Page 403 

SYSTEM B HYDRAULIC RETURN FILTER - UNIT SERVICING
1. General
A.  A container will be necessary to catch fluid when removing the filter bowl. Should any fluid spill on the airplane, decontaminate. Refer to Chapter 12, Cleaning and Washing.
2.  Equipment and Materials
A.  Skydrol Assembly Lube - MCS 352 or Fire Resistant Hydraulic Fluid – BMS 3-11
3.  Prepare Return Filter for Servicing
A.  Depressurize hydraulic system B. Refer to 29-12-0, Hydraulic System B-MP.
B.  Depressurize system B reservoir. Refer to 29-09-300, Hydraulic Reservoir Pressurization System - MP.
C.  Open system B pump circuit breakers on P6-11 and P6-12 panels.
4.  Replace Return Filter Element
A.  Remove Return Filter Element
(1)  
Remove filter bowl (4, Fig. 301).

NOTE:  When filter bowl is removed, shutoff valve (2) closes and prevents fluid from draining from the system.

(2)  
Remove filter element (5) from filter bowl.

(3)  
Clean filter bowl (4) and filter head (1) thoroughly and dispose of element.

500 
Feb 15/73  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  29-12-81 Page 301 

B.  Install Return Filter Element
(1)  
Lubricate O-rings and filter bowl threads with assembly lube or hydraulic fluid.

(2)  
Install O-ring (7, Fig. 301) on filter element (5) and place element in filter bowl.

(3)  
Deleted.

(4)  
Screw filter bowl (4) into filter head (l), hand tighten filter bowl until it reaches stop (3). Do not use wrench.

CAUTION:  DURING INSTALLATION, IT IS IMPERATIVE THAT EXTREME CARE BE TAKEN TO PREVENT IMPURITIES FROM ENTERING THE SYSTEM.

(5)  
Pressurize system B reservoir (Ref 29-09-300).

(6)  
Pressurize system B hydraulic system and check filter bowl for leaks (Ref 29-12-0).

(7)  
Lockwire filter bowl.

NOTE:  If leakage occurs at the filter bowl, replace the hydraulic return filter assembly (Ref 29-12-81/401). The leaking O-ring (6) is covered by a sleeve when the filter bowl is removed. Special tools are required to disassemble the filter to permit replacement of the O-ring.
500 
29-12-81 Page 302  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Aug 01/94 

F87622
500  System B Hydraulic Return Filter Servicing 
Aug 15/73  Figure 301  29-12-81 
Page 303 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 
　
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