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C.  Disconnect hydraulic lines from case drain filter and cap lines (Fig. 401).
D.  Remove mounting bolts and remove filter from engine.
4.  Install Case Drain Filter
A.  Install unions and O-rings in the case drain filter ports. Lubricate with assembly lube or hydraulic fluid.
B.  Position filter assembly on mounting bracket and install filter mounting bolts.
CAUTION: CHECK THAT ARROW ON CASE DRAIN FILTER IS POINTED "AFT."
C.  Remove caps from hydraulic lines and connect hydraulic lines to case drain filter.
D.  Pressurize hydraulic reservoir (Ref 29-09-300 MP).
E.  Motor applicable engine-driven hydraulic pump and check filter and connections for leaks (Ref 71-09-100, Power Plant (JT8D) - Operating Procedures).
F.  Close engine cowl.
500 
Oct 20/84  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  29-11-41 Page 401 

F86974
System A Hydraulic Pump Case Drain Filter Servicing  500 
29-11-41  Figure 401  Nov 15/67 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

SYSTEM A HYDRAULIC FLUID HEAT EXCHANGER - REMOVAL/INSTALLATION
EFFECTIVITY
Airplanes with 65-44571-XX Heat Exchangers
1.  General
A.  The heat exchanger for system A is installed in the bottom of No. 1 fuel tank. A container will be necessary to catch any fluid when removing the heat exchanger. Should any fluid spill on the airplane, the affected area must be decontaminated (Ref Chapter 12, Cleaning and Washing).
B.  Removal and installation of the heat exchanger requires entry into the No. 1 fuel tank. Refer to Chapter 28, Fuel Storage System, for precautionary measures and procedures before attempting removal or installation of the heat exchanger.
2.  Equipment and Materials
A.  Skydrol Assembly Lube - MCS 352 or Hydraulic Fluid - BMS 3-11
3.  Prepare System A Hydraulic Fluid Heat Exchanger for Removal
A.  Depressurize hydraulic system A (Ref 29-11-0 MP).
B.  Depressurize hydraulic reservoirs (Ref 29-09-300 MP).
C.  Defuel fuel tank No. 1 and remove fuel tank access panel just forward of heat exchanger (Ref Chapter 28, Fuel Storage System).
D.  Prepare fuel tank for entering to remove heat exchanger.
WARNING:  FUEL TANK IS HAZARDOUS AREA (REF CHAPTER 28, FUEL STORAGE SYSTEM). KNOW PRECAUTIONS BEFORE ENTERING FUEL TANK.
4.  Remove System A Hydraulic Fluid Heat Exchanger
A.  At the aft side of the rear spar (Fig. 401) where heat exchanger inlet and outlet lines pass through, disconnect hydraulic fittings (l). Remove and cap hydraulic lines.
Feb 20/85 29-11-51 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

F87147 F87152
System A Hydraulic Fluid Heat Exchanger Installation  500 
29-11-51  Figure 401 (Sheet 1)  Nov 15/67 
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500  System A Hydraulic Fluid Heat Exchanger Installation 
Nov 15/67  Figure 401 (Sheet 2)  29-11-51 
Page 403 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

B.  Remove unions (7), bulkhead nuts (8) and washers (9).
C.  Remove electrical bonding jumper (5) from tubing coil.
D.  Remove the heat exchanger mounting bolts (2) and (4).
E.  Loosen heat exchanger fittings from rear spar. 
NOTE:  O-rings may cause fittings to stick to spar.
F.  Remove exchanger through tank access opening.
CAUTION:  ENSURE ALL PARTS, TOOLS AND FOREIGN MATERIALS ARE REMOVED BEFORE LEAVING FUEL TANK.
5.  Install System A Hydraulic Fluid Heat Exchanger
A.  Insert O-rings (11) in grooves of heat exchanger fittings (Fig. 401).
B.  Pass heat exchanger through wing tank access opening with the inlet and outlet ports going through opening first.
WARNING:  FUEL TANK IS HAZARDOUS AREA. REFER TO CHAPTER 28, FUEL STORAGE SYSTEM. KNOW PRECAUTIONS BEFORE ENTERING TANK.
C.  Enter fuel tank and position inlet and outlet fittings so they enter the holes in rear spar.
NOTE:  Ensure that O-rings are properly seated, and that sealing surfaces on the rear spar are clean and free from flaws. Apply assembly lube or hydraulic fluid to all O-rings and fittings to facilitate installation.
D.  Align holes and install mounting bolts (2) and (4) through heat exchanger mounting clamps.
E.  Connect bonding jumper (5.)
CAUTION:  ENSURE ALL PARTS, TOOLS AND FOREIGN MATERIALS ARE REMOVED BEFORE LEAVING TANK.
　
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