Coupling Socket and Fill Valve
Figure 004
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C. Filter 1132GM
The filter of the reservoir filling system is installed on the ground service panel of the Green system. It is a HP filter with a filtration rating of 15 microns. It is made up of three main parts:
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the filter head,
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the filter bowl,
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the filter element.
The filter head has the hydraulic connections, a clogging indicator and a shut-off device installed in it. The clogging indicator is mechanical; a red button comes out to show that the filter element is too dirty. The clogging indicator has a thermal lock which inhibits operation when the fluid temperature decreases to 0 deg.C (32 deg.F). The thermal lock releases when the fluid temperature increases to 30 deg.C (86 deg.F). You can push the button back in to set it again. There is no by-pass device on the filter in case of a blocked filter element.
The shut-off device operates when you remove the filter bowl and element. It makes sure that no fluid leaks out of the system and no air enters while the element is removed. The filter bowl is attached to the filter head. It holds the filter element.
D. Hand Pump 1009GM
The hand pump is installed on the ground service panel of the Green hydraulic system. It provides the flow of fluid to fill the reservoirs if a ground supply is not available. The hand pump is the same as the hand pump installed on the ground service panel of the Yellow system. The hand pump has two suction connections. One is for use when the pump is installed in the Green system, the other for installation in the Yellow system.
The hand pump is a two-stage type. It can supply 40 ml per stroke at low pressure (LP) or 10 ml per stroke at high pressure (HP). The hand pump operates in the LP mode up to 20 +5 -5 bar (290 +72 -72 psi). At that pressure, a pressure-operated valve opens and connects the two large chambers. Thus the supply comes only from the two small chambers. In the HP mode, the hand pump can supply fluid at 206 bar (3000 psi) nominal pressure.
The pump has a HP pressure relief valve which opens at between 234 and
237.5 bar (3400 and 3445 psi) . Also in the pump are eight check valves which control the flow of fluid between the chambers of the pump.
The hand pump handle is the same one as is used for the Yellow system pump. It is kept in the ground service panel of the Yellow hydraulic system. It is telescopic and is 540 mm (21.25 in.) long when it is extended and 325 mm (12.8 in.) long when it is retracted. The splined connection on the hand pump is made so that you can attach the handle only in the correct position.
E. Reservoir Filling Selector Valve 1134GQ
The reservoir filling selector valve directs hydraulic fluid from the supply to the reservoir of the system which is selected. The selector valve can be set in any one of four positions. They are one for each hydraulic system (YELLOW, BLUE or GREEN) and an off position (identified as NEUTRAL). A spring detent mechanism keeps the selector valve in its set position. The selector valve assembly has two main parts:
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the hydraulic selector unit which controls the flow of fluid to the reservoirs,
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the electrical switch unit which controls the supply of power to the electrical contents indicator.
The hydraulic selector is a 4 port/4 way valve. It is turned by a shaft connected to the operating handle. The operating handle is also a pointer to show which system is selected. The four set positions are at 90 deg. to each other. The four hydraulic ports are identified as:
-A - supply inlet,
-B - outlet to the reservoir of the Blue hydraulic system,
-G - outlet to the reservoir of the Green hydraulic system,
-Y - outlet to the reservoir of the Yellow hydraulic system.
A thermal relief valve protects the selector valve from thermal expansion of fluid when it is in the NEUTRAL position. The thermal relief valve opens at 35 +5 -5 bar (507 +72 -72 psi) and closes at 20 bar (290 psi). The fluid released through the thermal relief valve goes out of a port connected to the Yellow hydraulic system.
The electrical switch unit is attached to the bottom of the hydraulic selector. The same shaft which operates the hydraulic selector also operates the hydraulic switch unit. A reduction gear (3:1) reduces the travel of the switch in relation to the input shaft. The switch assembly is made up of a double wafer and a double rotor. Together they make it possible to switch the five circuits to the four possible selections (N,Y,B,G). Seals are installed between the hydraulic and electrical parts of the selector valve assembly. They make sure that no fluid goes into the electrical switch mechanism, but goes out as external leakage.
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