STANDBY HYDRAULIC SYSTEM 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 pump should be removed and the pressure line flushed.
B.  A container will be necessary to catch fluid when disconnecting hydraulic lines. Should any fluid spill, decontaminate (Ref Chapter 12, Cleaning and Washing).
2.  Equipment and Materials

A.  Skydrol Assembly Lube - MCS 352 or Fire Resistant Hydraulic Fluid - BMS\3-11
3.  Servicing Hydraulic Pump Case Drain Filter
A.  Depressurize hydraulic reservoirs (Ref 29-09-300 MP).
B.  Check Case Drain Filter Magnetic Plug
(1)  
Unscrew magnetic plug (7, Fig. 301) and check for metal contamination on plug, and in hydraulic fluid lost during removal of plug.

(2)  
Place new O-ring (8) on magnetic plug . Apply assembly lube or hydraulic fluid to 0-ring and threads of plug, then screw plug into drain plug (6). Apply a torque of 15 to 20 pound-inches to magnetic plug, while holding drain plug.

(3)  
Lockwire magnetic plug and drain plug.

C.  Remove Case Drain Filter Element
(1)  
Open standby pump circuit breakers on P6-11 and P6-12 panels.

(2)  
Unscrew filter bowl (4, Fig. 301) from filter head (l). Remove bowl with filte r element (3).

(3)  
Remove filter element and spring (5). Check element and bowl for metal contamination.

(4)  
Replace paper filter element (3) and clean filter bowl (4), magnetic plug (7) and spring (5).

500 
Jun 20/85  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  29-21-31 Page 301 

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Standby Hydraulic System Case Drain Filter Servicing  500 
29-21-31  Figure 301  Aug 15/67 
Page 302 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

D.  Install Case Drain Filter Element
(1)  
Insert backup ring, O-ring and backup ring (10, Fig. 301) in filter head groove.

(2)  
Insert O-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 96 to 120 pound-inches to filter bowl and lockwire.

(5)  
Pressurize standby system and check filter for leaks.

(a)  
Connect electrical power to airplane.

(b)  
Close standby pump circuit breaker on P6-11 and P6-12 panels.

WARNING:  PERSONNEL STAND CLEAR OF RUDDER AND LEADING EDGE DEVICES.

(c)  
On overhead panel, position system A flight control switch to STBY RUD and cycle rudder.

(d)  
Place switch in off position and remove electrical power.

(6)  
Service Hydraulic reservoirs. Refer to Chapter 12, Hydraulic Fluid Servicing.

500 
May 01/01  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  29-21-31 Page 303 

STANDBY HYDRAULIC SYSTEM CASE DRAIN FILTER - REMOVAL/INSTALLATION
1.  General

A.  A container will be necessary to catch fluid when disconnecting hydraulic lines. Should any fluid spill, 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 Case Drain Filter for Removal
A.  Open standby pump circuit breakers on P6-11 and P6-12 panels.
B.  Depressurize hydraulic reservoirs. Refer to 29-09-300, Hydraulic Reservoir Pressurization System - MP.
C.  Drain standby hydraulic reservoir.
4.  Remove Case Drain Filter

A.  Disconnect hydraulic lines from filter and install protective covers (Fig. 401).
B.  Remove filter mounting bolts and remove filter.
5.  Install Case Drain Filter

A.  Lubricate 0-rings and threaded fittings with assembly lube or hydraulic fluid at installation.
B.  Install O-ring and union in inlet port of filter (Fig. 401).
C.  Install O-ring and check valve in outlet port of filter.
D.  Position filter on mounting bracket and install mounting bolts.
E.  Check that filter bowl and magnetic plug are tight and lockwired.
　
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