SYSTEM A HYDRAULIC PRESSURE FILTER - UNIT SERVICING
1. General
A. A container will be necessary to catch hydraulic fluid when removing pressure filter element. Should any fluid spill on the airplane, 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
Replace Pressure Filter Element
A. Remove Pressure Filter Element
(1)
Depressurize hydraulic system A (Ref 29-11-0 MP).
(2)
Unscrew filter bowl with element (Fig. 301).
(3)
Clean filter bowl, and discard filter element.
B. Install Pressure Filter Element
(1)
Install backup ring, O-ring and backup ring in groove in modular housing (Fig. 301).
(2)
Lubricate 0-ring and backup ring with assembly lube or hydraulic fluid and install in groove at top of filter element.
(3)
Lightly lubricate filter bowl threads with assembly lube or hydraulic fluid.
(4)
Partially prefill filter bowl with hydraulic fluid. Place element in filter bowl and screw into modular housing.
(5)
Apply a torque of 50 to 200 pound-inches to filter bowl and secure with lockwire.
(6)
Pressurize hydraulic system A by motoring engines (Ref 71-09-100, Power Plant (JT8D) -Operating Procedures).
(7)
Check pressure filter for leaks.
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Oct 20/90 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 29-11-71 Page 301
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System A Hydraulic Pressure Filter Servicing 500
29-11-71 Figure 301 Aug 15/67
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HYDRAULIC SYSTEM A PRESSURE RELIEF VALVE - REMOVAL/INSTALLATION
1. General
A. The system A pressure relief valve is installed in the system A module unit, which is mounted on the forward bulkhead of the left wheel well.
B. A container will be necessary to catch fluid when removing the relief valve. Should fluid spill on the airplane, the affected area must be decontaminated. 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. Remove Hydraulic System A Pressure Relief Valve
A. Depressurize hydraulic system A. Refer to 29-11-0, Hydraulic System A - MP.
B. Depressurize hydraulic reservoir. Refer to 29-09-300, Hydraulic Reservoir Pressurization System - MP.
C. Unscrew pressure relief valve and remove from module unit (Fig. 401).
D. Install protective plug in open port of module unit.
4. Install Hydraulic System A Pressure Relief Valve
A. Install 0-rings between backup rings in each relief valve groove (Fig.\401).
B Apply assembly lube or hydraulic fluid to 0-rings and to the threads of relief valve to facilitate installation. Remove protective plug and screw relief valve into module housing. Apply 50 to 200 pound-inches of torque to relief valve.
D Pressurize hydraulic system A by motoring engines. Refer to 71-09-100, Power Plant (JT8D) -
Operating Procedures.
E Check relief valve for leaks.
F Secure relief valve with lockwire.
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System A Pressure Relief Valve Installation 500
29-11-91 Figure 401 Nov 15/67
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
HYDRAULIC SYSTEM A CHECK VALVES - REMOVAL/INSTALLATION
1. General
A. The system A check valves are installed in the system A module unit which is mounted on the forward bulkhead of the left wheel well.
B. A container will be necessary to catch hydraulic fluid when removing either of the check valves from the module unit. Should fluid spill on the airplane, the affected area must be decontaminated by following the procedures outlined in Chapter 12, Cleaning and Washing.
Equipment and Materials
A. Skydrol Assembly Lube - MCS 352 or Fire Resistant Hydraulic Fluid - BMS\3-11
3. Remove Hydraulic System A Check Valve
A. Depressurize hydraulic System A (Ref 29-11-0 MP).
B. Depressurize hydraulic reservoirs (Ref 29-09-300 MP).
C. Unscrew and remove check valve from module unit (Fig. 401).
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