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A 737-300/400/500MAINTENANCE MANUAL
B. The three reservoirs are round tanks of the same design but of different size. The system A reservoir holds 4.8 U.S. gallons; the system B reservoir holds 7.2 U.S. gallons; and the standby system reservoir holds
2.8 U.S. gallons. The reservoirs are pressurized to approximately 45 psi by the pneumatic system to assure a supply of fluid to the pumps, to prevent fluid foaming, and to maintain normal return pressure in the hydraulic system. See description of reservoir pressurization system AMM 29-09-00.
C. Systems A and B reservoirs have a quantity indicator/transmitter on the reservoir, and a quantity indicator at the P3 panel (on airplanes without engine instrument system) or on P2 panel (on airplanes with engine instrument system) . Systems A and B reservoirs also have overpressure relief, depressurization, and drain sampling valves connected to them.
D. The standby reservoir has a low quantity switch on the reservoir and a light on the P5 panel.
E. A pressure relief valve is near the top of systems A and B reservoirs. The pressure relief valve opens under high air or fluid pressure (60 to 65 psi) to protect the reservoir. The drain/sampling valve is a manual valve at the bottom of the reservoir.
MOTOR SUPPLY LINE ELECTRICAL CONNECTION
PRESSURE LINE
PUMP
KEEL BEAM CASE
FWD
DRAIN
LINE
Standby Hydraulic System Electric Motor-Driven Pump (EMDP)
Figure 7
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P6 SENSINGRELAY
Standby Electric Motor-Driven Pump (EMDP) Control
Figure 8
A 737-300/400/500MAINTENANCE MANUAL
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737-300/400/500MAINTENANCE MANUAL
F. A common vent line is connected between the systems A and B reservoir pressure relief valves to allow venting of fluid residue and to prevent fluid backflow into the pneumatic system.
On airplanes not incorporating SB 29-1061, fluid residue from the systems A and B reservoirs is vented in the wheel well.
On airplanes incorporating SB 29-1061, fluid residue from the systems A and B reservoirs is vented through an overboard drain mast.
Return Filter Module (Fig. 10)
____________________
A. The return filter module in systems A and B filters fluid returning from the user systems to the respective reservoir. Systems A and B return filter modules are in the wheel well on the lower left and right forward bulkhead, respectively. The standby system fluid filtration is through the standby system pressure filter module on the aft center bulkhead.
B. Each return filter module includes a throw-away filter. A red indicator button mounted on the module reacts to a differential pressure of 65 |8 psi, and pops up to show when the filter is blocked. An internal by-pass valve routes fluid around a blocked filter. A spring-loaded shutoff poppet in the module prevents fluid loss when the filter element is removed. Check valves prevent backflow through the filter.
System Pressure Module (Fig. 11)
______________________
A. Each system pressure module filters fluid under pressure from its respective pumps.
B. Systems A and B modules each include two throw-away filters, one for fluid from each pump.
C. Each system A and B module contains two pump low pressure switches. The module also has two check valves and the system pressure relief valve.
D. The standby system pressure module includes two manual/electric motor
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