HYDRAULIC GROUND SERVICING SYSTEM - DESCRIPTION AND OPERATION
1.  General
A.  The hydraulic ground servicing system is provided to fill all hydraulic reservoirs from one location (Fig. 1). A fluid filling station located in the right wheel well consists of a manually operated hand pump with a suction line, a connection for pressure filling, and a ground servicing filter. The system also includes the necessary tubing and connections required to connect the fill station components to the hydraulic reservoirs. A fluid quantity indicator mounted on the system. A reservoir is visible from the filling station. When servicing the hydraulic systems, the reservoirs are vented through the reservoir pressure regulator. Refer to 29-09-300, Hydraulic Reservoir Pressurization System. For hydraulic power system fluid servicing procedures, refer to Chapter 12, Hydraulic Fluid Servicing.
2.  Ground Servicing Hand Pump
A.  The ground servicing hand pump is used to service the hydraulic reservoirs when pressure fill equipment is not available (Fig. 1). The hand pump is located in the right wheel well. The pump consists of a piston, handle, two mounting holes through the lower side of the pump body, and two ports for supply and discharge of fluid. A suction line is attached to the supply port of the pump.
3.  Ground Servicing Filter
A.  The ground servicing filter is installed downstream of the hand pump and pressure fill connection. The filter prevents contamination of the hydraulic power system reservoirs and filters during ground filling of a filter head, filter bowl, and a 0.4 to 3 micron noncleanable element.
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May 15/67  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  29-09-200 Page 1 

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29-09-200  Figure 1  Aug 01/74 
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

GROUND SERVICING HAND PUMP - REMOVAL/INSTALLATION
1. General
A.  A container will be necessary to catch fluid from the hand pump and disconnected hydraulic lines. Should any fluid spill on the airplane, 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.  Remove Ground Servicing Hand Pump
A.  Disconnect and cap hydraulic pump inlet and outlet lines (Fig. 401).
B.  Install protective covers on pump inlet and outlet ports.
C.  Remove pump mounting bolts and remove hand pump.
4.  Install Ground Servicing Hand Pump
A.  Remove protective cover from pump ports.
B.  Apply assembly lube or hydraulic fluid to O-rings and unions and install in inlet and outlet ports.
C.  Position hand pump in mounting position and install pump mounting bolts and washers (Fig. 401).
D.  Remove protective caps on lines and connect line to inlet and outlet ports.
CAUTION:  DURING INSTALLATION, IT IS IMPERATIVE THAT EXTREME CARE BE TAKEN TO PREVENT IMPURITIES FROM ENTERING THE SYSTEM. ALL CONNECTIONS MUST BE TIGHT TO PREVENT FLUID AND AIR LEAKAGE.
E.  Check operation of pump by pumping a small quantity of fluid through pump.
CAUTION:  USE CONTAINER TO CATCH ANY FLUID PUMPED OVERBOARD WHILE CHECKING PUMP.
F.  Check pump connections for any sign of leakage.
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29-09-211  Figure 401  May 15/67 
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HYDRAULIC GROUND SERVICING FILTER - UNIT SERVICING
1.  General
A.  The ground servicing filter bowl should be removed at regular intervals and the filter element checked for contamination. If excessive contamination exists, the element should be replaced.
B.  A container will be necessary to catch fluid from the disconnected hydraulic lines. 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
3.  Remove Ground Servicing Filter Element
A.  Gain access to filter located in the right wheel well.
B.  Remove filter bowl with filter element (Ref 29-09-221 R/I).
C.  Remove and dispose of element and clean filter bowl.
4.  Install Ground Servicing Filter Element
A.  Lubricate O-rings, backup rings and filter bowl threads with assembly lube or hydraulic fluid.
　
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