F88286
System B Check Valve Installation 500
29-12-61 Figure 401 Nov 15/67
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
SYSTEM B HYDRAULIC PUMP CASE DRAIN FILTER - UNIT SERVICING
1. General
A. The hydraulic pump case drain filter element should be removed and checked at regular intervals. Between these intervals the magnetic plug in the filter case should be removed and checked for metal contamination. If excessive metal is found, the associated pump should be removed and the system checked and flushed (Ref 29-12-0, Hydraulic System B - MP and I/C).
B. A container will be necessary to catch fluid when disconnecting hydraulic lines. Should any fluid spill, decontaminate (Ref Chapter 12, Cleaning and Washing).
C. The servicing procedures for both system B case drain filters are identical, therefore only one procedure is given.
2. Equipment and Material
A. Skydrol Assembly Lube - MCS 852 or Hydraulic Fluid - BMS 3-11 (Ref. 20-30-21)
3. Check Case Drain Filter Magnetic Plug
A. Depressurize hydraulic reservoir (Ref 29-09-300 MP).
B. Unscrew magnetic plug (7, Fig. 301) and check for metal contamination on plug. Check for contamination in hydraulic fluid lost during removal of plug.
C. Place new 0-ring (8) on magnetic plug. Apply assembly lube or hydraulic fluid to 0-ring and threads of magnetic plug, then screw plug into drain plug (6). Hold drain plug and tighten magnetic plug to 15-20 pound-inches.
D. Lockwire magnetic plug and drain plug.
4. Removal/Installation System B Pump Case Drain Filter Element
A. Remove Case Drain Filter Element
(1)
Open SYSTEM B PUMP NORMAL and ALTERNATE circuit breakers on P6 load control center panel.
(2)
Depressurize hydraulic reservoirs. Refer to 29-09-300, Hydraulic Reservoir Pressurization System - Maintenance Practices.
(3)
Disconnect system B pump supply hose at the reservoir quick disconnect fitting to prevent fluid from draining through pump.
(4)
Unscrew filter bowl (4, figure 301) from filter head (1). Remove bowl with filter element (3).
(5)
Remove filter element and spring (5). Check element and bowl for metal contamination.
(6)
Replace paper filter element (3) and clean filter bowl, magnetic plug and spring.
500
May 15/78 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 29-12-71 Page 301
B. Install Case Drain Filter Element
(1)
Insert backup ring, 0-ring and backup ring (10, figure 301) in filter head groove.
(2)
Insert 0-ring (2) in filter element groove.
(3)
Install spring (5) and filter element (3) in filter bowl (4).
(4)
Lubricate threads lightly with assembly lube or hydraulic fluid and screw filter bowl (4) into filter head (1). Apply a torque of 50 to 75 pound-inches to filter bowl and lockwire.
(5)
Connect pump supply hose to reservoir quick disconnect fitting.
(6)
Close SYSTEM B PUMP NORMAL and ALTERNATE circuit breakers on P6 load control center panel.
(7)
Pressurize system B hydraulic system using the applicable pump.Refer to 29-12-0, Hydraulic System B - MP.
(8)
Check filter for leaks.
500
29-12-71 Page 302 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 15/73
F87564
500 System B Hydraulic Pump Case Drain Filter Servicing
Aug 15/67 Figure 301 29-12-71
Page 303
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
SYSTEM B HYDRAULIC PUMP CASE DRAIN FILTER - REMOVAL/INSTALLATION
1. General
A. The maintenance practices for the system B hydraulic pump case drain filters are identical, therefore only one procedure is given.
B. A container will be necessary to catch any fluid when disconnecting hydraulic lines. Should any fluid spill, decontaminate. See Chapter 12, Cleaning and Washing.
2. Equipment and Materials
A. Skydrol Assembly Lube - MCS 352 or Fire Resistant Hydraulic Fluid - BMS 3-11
3. Remove Case Drain Filter
A. Open SYSTEM B NORMAL and ALTERNATE circuit breakers on P6 load control center.
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