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Hydraulic System B Component Location 500
29-12-0 Figure 1 Nov 15/66
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
500 Hydraulic System B Schematic
May 15/67 Figure 2 (Sheet 1) 29-12-0
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
EFFECTIVITY
NZ ZK-NAP THRU ZK-NAS
YB 9H-ABA THRU 9H-ABC
Hydraulic System B Schematic 596
29-12-0 Figure 2 (Sheet 2) Feb 20/90
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
System B Electric Motor-Driven Pumps
A. Hydraulic system B pressure is supplied by two electric motor-driven hydraulic pump assemblies. The pumps are located on the forward bulkhead of the wheel well area (Fig. 1) and are controlled by switches on the forward overhead panel. Each pump is a pressure compensated, variable displacement pump that will deliver a maximum flow of about 6 gpm at approximately 3000 psi upon demand by the hydraulic system. For a more detailed description of the system B pumps, refer to the unit level coverage.
4. System B Modular Unit
A. The modular unit (Fig. 3) is provided to manifold hydraulic fluid to various easily replaceable cartridge type components. The modular unit consists of a 5 port housing providing attachment provisions for the cartridge type hydraulic pump pressure filters, pump low pressure warning switches, check valves, pressure relief valve, and male fittings for attaching system tubing connectors. The modular unit housing has drilled passages to provide system flow through the unit. The modular unit is installed on the forward bulkhead of the right wheel well.
5. System B Hydraulic Filters
A. Pressure Filters
(1) A nonbypass cartridge type pressure filter in the pressure line from each electric motor-driven pump filters the hydraulic fluid before it enters the various systems (Fig. 2). The pressure filters are installed in system B modular unit, and consist of a filter bowl and noncleanable element (Fig. 4).
B. Return Filters
(1) A return filter installed in the return line near the reservoir filters the hydraulic fluid before it enters the reservoir (Fig. 2). The filter consists of a filter bowl, disposable filter element and a filter head. The filter head incorporates a relief valve, a shutoff valve and two cartridge type check valves (Fig. 4). The relief valve is provided to bypass the hydraulic fluid in the event of excessive restriction to flow through the filter element. The shutoff valve is provided to prevent hydraulic fluid from draining through the filter from the reservoir or the system return line when the filter bowl is removed. Two additional ports are provided in the filter head for installation of a temperature switch and for pressure filling of the system. However, these two ports are not used and are therefore plugged.
500
May 15/68 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 29-12-0 Page 5
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System B Modular Unit 500
29-12-0 Figure 3 Nov 15/66
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
500 System B Hydraulic Filters
May 15/68 Figure 4 29-12-0
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(2) The cartridge type check valves are installed in the filter head to direct fluid flow through the filter element from the outside in, and to prevent contaminated fluid from being drawn out into the return system from the IN port of the filter when the system is depressurized and a hydraulic component is manually actuated.
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