F86959
Hydraulic Supply (Fire) Shutoff Valve 543
29-11-21 Figure 401 Feb 15/73
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
C. Connect electrical connector to shutoff valve.
D. Service hydraulic reservoirs. Refer to Chapter 12, Hydraulic Fluid Servicing.
E. Pressurize reservoir system. Refer to 29-09-300, Hydraulic Reservoir Pressurization System -MP.
F. Provide electrical power to airplane and close HYDRAULIC FLUID SHUTOFF VALVE ENGINE NO. 1 and NO. 2 circuit breakers on P6 load control panel.
G. On P8 aft electronic panel, pull corresponding fire switch. Check that position indicator on valve moves to the CLOSED position and that valve motor stops operating. Check valve for leaks.
H. Push the corresponding fire switch in. Check that position indicator on valve moves to the OPEN position and that valve motor stops operating.
I. Remove electrical power from airplane.
500
May 01/99 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 29-11-21 Page 403
SYSTEM A ENGINE-DRIVEN HYDRAULIC PUMP - DESCRIPTION AND OPERATION
1. General
A. Hydraulic system A pressure is supplied by two variable displacement pumps with a delivery rate of about 22 gpm at 3000 psi. The pump is a compensated unit capable of operating in two modes, normal and depressurized. The pump is mounted on the lower right side of the engine.
B. The pumping mechanism consists of a revolving cylinder barrel containing nine pistons. The cylinder barrel is supported and driven by the internal drive shaft. The pistons are supported in the cylinder block and connected to the rotating cam plate by hydraulically balanced piston shoes. Oil at system pressure is admitted through holes in the piston and piston shoe to an undercut area in the face of the shoe. The pressure applied to the undercut area, which is slightly less than the piston area, balances the forces so that the shoes and cam plate are supported on an oil film at 11 times. The axial thrust of the cylinder barrel is also hydraulically balanced against the adapter block. The rotating cam plate causes the pistons to reciprocate as the cylinder barrel revolves. The cam plate is supported in the inclined yoke and restrained in the yoke by the hold-down plate. The stroke of the pistons is varied by changing the angle of inclination of the yoke and the cam plate, thereby changing the displacement of the pump. The angle of inclination of the yoke, in turn, is controlled by the compensator actuator piston and compensator valve.
501
May 01/74 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 29-11-32 Page 1
F87492 F87502
System A Engine-Driven Hydraulic Pump 531
29-11-32 Figure 1 (Sheet 1) Feb 15/73
Page 2
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
531 System A Engine-Driven Hydraulic Pump
Feb 15/73 Figure 1 (Sheet 2) 29-11-32
Page 3
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
SYSTEM A ENGINE-DRIVEN HYDRAULIC PUMP - REMOVAL/INSTALLATION
1. General
A. Should the hydraulic pump be replaced due to mechanical malfunction, replace the pressure and case drain filter elements and flush the lines between the pump and filters prior to replacing the pump (Ref 29-11-0, Inspection/Check). The No. 1 and 2 engine-driven hydraulic pumps are identical except for their location. Both engine-driven hydraulic pumps will be covered by the same maintenance procedure.
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